Add OpenTelemetry tracing and metrics support

README.md

@@ -57,7 +57,7 @@ _(But if you'd rather configure some of your routes manually, Traefik supports t
 - Provides HTTPS to your microservices by leveraging [Let's Encrypt](https://letsencrypt.org)  (wildcard certificates support)
 - Circuit breakers, retry
 - See the magic through its clean web UI
-- Websocket, HTTP/2, GRPC ready
+- Websocket, HTTP/2, gRPC ready
 - Provides metrics (Rest, Prometheus, Datadog, Statsd, InfluxDB)
 - Keeps access logs (JSON, CLF)
 - Fast

cmd/traefik/traefik.go

@@ -504,24 +504,30 @@ func registerMetricClients(metricsConfig *types.Metrics) []metrics.Registry {
 		logger := log.With().Str(logs.MetricsProviderName, "datadog").Logger()
 
 		registries = append(registries, metrics.RegisterDatadog(logger.WithContext(context.Background()), metricsConfig.Datadog))
-		logger.Debug().Msgf("Configured Datadog metrics: pushing to %s once every %s",
+		logger.Debug().
-			metricsConfig.Datadog.Address, metricsConfig.Datadog.PushInterval)
+			Str("address", metricsConfig.Datadog.Address).
+			Str("pushInterval", metricsConfig.Datadog.PushInterval.String()).
+			Msgf("Configured Datadog metrics")
 	}
 
 	if metricsConfig.StatsD != nil {
 		logger := log.With().Str(logs.MetricsProviderName, "statsd").Logger()
 
 		registries = append(registries, metrics.RegisterStatsd(logger.WithContext(context.Background()), metricsConfig.StatsD))
-		logger.Debug().Msgf("Configured StatsD metrics: pushing to %s once every %s",
+		logger.Debug().
-			metricsConfig.StatsD.Address, metricsConfig.StatsD.PushInterval)
+			Str("address", metricsConfig.StatsD.Address).
+			Str("pushInterval", metricsConfig.StatsD.PushInterval.String()).
+			Msg("Configured StatsD metrics")
 	}
 
 	if metricsConfig.InfluxDB != nil {
 		logger := log.With().Str(logs.MetricsProviderName, "influxdb").Logger()
 
 		registries = append(registries, metrics.RegisterInfluxDB(logger.WithContext(context.Background()), metricsConfig.InfluxDB))
-		logger.Debug().Msgf("Configured InfluxDB metrics: pushing to %s once every %s",
+		logger.Debug().
-			metricsConfig.InfluxDB.Address, metricsConfig.InfluxDB.PushInterval)
+			Str("address", metricsConfig.InfluxDB.Address).
+			Str("pushInterval", metricsConfig.InfluxDB.PushInterval.String()).
+			Msg("Configured InfluxDB metrics")
 	}
 
 	if metricsConfig.InfluxDB2 != nil {
@@ -530,8 +536,25 @@ func registerMetricClients(metricsConfig *types.Metrics) []metrics.Registry {
 		influxDB2Register := metrics.RegisterInfluxDB2(logger.WithContext(context.Background()), metricsConfig.InfluxDB2)
 		if influxDB2Register != nil {
 			registries = append(registries, influxDB2Register)
-			logger.Debug().Msgf("Configured InfluxDB v2 metrics: pushing to %s (%s org/%s bucket) once every %s",
+			logger.Debug().
-				metricsConfig.InfluxDB2.Address, metricsConfig.InfluxDB2.Org, metricsConfig.InfluxDB2.Bucket, metricsConfig.InfluxDB2.PushInterval)
+				Str("address", metricsConfig.InfluxDB2.Address).
+				Str("bucket", metricsConfig.InfluxDB2.Bucket).
+				Str("organization", metricsConfig.InfluxDB2.Org).
+				Str("pushInterval", metricsConfig.InfluxDB2.PushInterval.String()).
+				Msg("Configured InfluxDB v2 metrics")
+		}
+	}
+
+	if metricsConfig.OpenTelemetry != nil {
+		logger := log.With().Str(logs.MetricsProviderName, "openTelemetry").Logger()
+
+		openTelemetryRegistry := metrics.RegisterOpenTelemetry(logger.WithContext(context.Background()), metricsConfig.OpenTelemetry)
+		if openTelemetryRegistry != nil {
+			registries = append(registries, openTelemetryRegistry)
+			logger.Debug().
+				Str("address", metricsConfig.OpenTelemetry.Address).
+				Str("pushInterval", metricsConfig.OpenTelemetry.PushInterval.String()).
+				Msg("Configured OpenTelemetry metrics")
 		}
 	}
 
@@ -617,6 +640,14 @@ func setupTracing(conf *static.Tracing) *tracing.Tracing {
 		}
 	}
 
+	if conf.OpenTelemetry != nil {
+		if backend != nil {
+			log.Error().Msg("Tracing backends are all mutually exclusive: cannot create OpenTelemetry backend.")
+		} else {
+			backend = conf.OpenTelemetry
+		}
+	}
+
 	if backend == nil {
 		log.Debug().Msg("Could not initialize tracing, using Jaeger by default")
 		defaultBackend := &jaeger.Config{}

docs/content/observability/metrics/opentelemetry.md

@@ -0,0 +1,353 @@
+---
+title: "Traefik OpenTelemetry Documentation"
+description: "Traefik supports several metrics backends, including OpenTelemetry. Learn how to implement it for observability in Traefik Proxy. Read the technical documentation."
+---
+
+# OpenTelemetry
+
+To enable the OpenTelemetry:
+
+```yaml tab="File (YAML)"
+metrics:
+  openTelemetry: {}
+```
+
+```toml tab="File (TOML)"
+[metrics]
+  [metrics.openTelemetry]
+```
+
+```bash tab="CLI"
+--metrics.openTelemetry=true
+```
+
+!!! info "The OpenTelemetry exporter will export metrics to the collector by using HTTP by default, see the [gRPC Section](#grpc-configuration) to use gRPC."
+
+#### `address`
+
+_Required, Default="localhost:4318", Format="`<host>:<port>`"_
+
+Address of the OpenTelemetry Collector to send metrics to.
+
+```yaml tab="File (YAML)"
+metrics:
+  openTelemetry:
+    address: localhost:4318
+```
+
+```toml tab="File (TOML)"
+[metrics]
+  [metrics.openTelemetry]
+    address = "localhost:4318"
+```
+
+```bash tab="CLI"
+--metrics.openTelemetry.address=localhost:4318
+```
+
+#### `addEntryPointsLabels`
+
+_Optional, Default=true_
+
+Enable metrics on entry points.
+
+```yaml tab="File (YAML)"
+metrics:
+  openTelemetry:
+    addEntryPointsLabels: true
+```
+
+```toml tab="File (TOML)"
+[metrics]
+  [metrics.openTelemetry]
+    addEntryPointsLabels = true
+```
+
+```bash tab="CLI"
+--metrics.openTelemetry.addEntryPointsLabels=true
+```
+
+#### `addRoutersLabels`
+
+_Optional, Default=false_
+
+Enable metrics on routers.
+
+```yaml tab="File (YAML)"
+metrics:
+  openTelemetry:
+    addRoutersLabels: true
+```
+
+```toml tab="File (TOML)"
+[metrics]
+  [metrics.openTelemetry]
+    addRoutersLabels = true
+```
+
+```bash tab="CLI"
+--metrics.openTelemetry.addRoutersLabels=true
+```
+
+#### `addServicesLabels`
+
+_Optional, Default=true_
+
+Enable metrics on services.
+
+```yaml tab="File (YAML)"
+metrics:
+  openTelemetry:
+    addServicesLabels: true
+```
+
+```toml tab="File (TOML)"
+[metrics]
+  [metrics.openTelemetry]
+    addServicesLabels = true
+```
+
+```bash tab="CLI"
+--metrics.openTelemetry.addServicesLabels=true
+```
+
+#### `explicitBoundaries`
+
+_Optional, Default=".005, .01, .025, .05, .1, .25, .5, 1, 2.5, 5, 10"_
+
+Explicit boundaries for Histogram data points.
+
+```yaml tab="File (YAML)"
+metrics:
+  openTelemetry:
+    explicitBoundaries:
+      - 0.1
+      - 0.3
+      - 1.2
+      - 5.0
+```
+
+```toml tab="File (TOML)"
+[metrics]
+  [metrics.openTelemetry]
+    explicitBoundaries = [0.1,0.3,1.2,5.0]
+```
+
+```bash tab="CLI"
+--metrics.openTelemetry.explicitBoundaries=0.1,0.3,1.2,5.0
+```
+
+#### `headers`
+
+_Optional, Default={}_
+
+Additional headers sent with metrics by the reporter to the OpenTelemetry Collector.
+
+```yaml tab="File (YAML)"
+metrics:
+  openTelemetry:
+    headers:
+      foo: bar
+      baz: buz
+```
+
+```toml tab="File (TOML)"
+[metrics]
+  [metrics.openTelemetry.headers]
+    foo = "bar"
+    baz = "buz"
+```
+
+```bash tab="CLI"
+--metrics.openTelemetry.headers.foo=bar --metrics.openTelemetry.headers.baz=buz
+```
+
+#### `insecure`
+
+_Optional, Default=false_
+
+Allows reporter to send metrics to the OpenTelemetry Collector without using a secured protocol.
+
+```yaml tab="File (YAML)"
+metrics:
+  openTelemetry:
+    insecure: true
+```
+
+```toml tab="File (TOML)"
+[metrics]
+  [metrics.openTelemetry]
+    insecure = true
+```
+
+```bash tab="CLI"
+--metrics.openTelemetry.insecure=true
+```
+
+#### `pushInterval`
+
+_Optional, Default=10s_
+
+Interval at which metrics are sent to the OpenTelemetry Collector.
+
+```yaml tab="File (YAML)"
+metrics:
+  openTelemetry:
+    pushInterval: 10s
+```
+
+```toml tab="File (TOML)"
+[metrics]
+  [metrics.openTelemetry]
+    pushInterval = "10s"
+```
+
+```bash tab="CLI"
+--metrics.openTelemetry.pushInterval=10s
+```
+
+#### `path`
+
+_Required, Default="/v1/traces"_
+
+Allows to override the default URL path used for sending metrics.
+This option has no effect when using gRPC transport.
+
+```yaml tab="File (YAML)"
+metrics:
+  openTelemetry:
+    path: /foo/v1/traces
+```
+
+```toml tab="File (TOML)"
+[metrics]
+  [metrics.openTelemetry]
+    path = "/foo/v1/traces"
+```
+
+```bash tab="CLI"
+--metrics.openTelemetry.path=/foo/v1/traces
+```
+
+#### `tls`
+
+_Optional_
+
+Defines the TLS configuration used by the reporter to send metrics to the OpenTelemetry Collector.
+
+##### `ca`
+
+_Optional_
+
+`ca` is the path to the certificate authority used for the secure connection to the OpenTelemetry Collector,
+it defaults to the system bundle.
+
+```yaml tab="File (YAML)"
+metrics:
+  openTelemetry:
+    tls:
+      ca: path/to/ca.crt
+```
+
+```toml tab="File (TOML)"
+[metrics.openTelemetry.tls]
+  ca = "path/to/ca.crt"
+```
+
+```bash tab="CLI"
+--metrics.openTelemetry.tls.ca=path/to/ca.crt
+```
+
+##### `cert`
+
+_Optional_
+
+`cert` is the path to the public certificate used for the secure connection to the OpenTelemetry Collector.
+When using this option, setting the `key` option is required.
+
+```yaml tab="File (YAML)"
+metrics:
+  openTelemetry:
+    tls:
+      cert: path/to/foo.cert
+      key: path/to/foo.key
+```
+
+```toml tab="File (TOML)"
+[metrics.openTelemetry.tls]
+  cert = "path/to/foo.cert"
+  key = "path/to/foo.key"
+```
+
+```bash tab="CLI"
+--metrics.openTelemetry.tls.cert=path/to/foo.cert
+--metrics.openTelemetry.tls.key=path/to/foo.key
+```
+
+##### `key`
+
+_Optional_
+
+`key` is the path to the private key used for the secure connection to the OpenTelemetry Collector.
+When using this option, setting the `cert` option is required.
+
+```yaml tab="File (YAML)"
+metrics:
+  openTelemetry:
+    tls:
+      cert: path/to/foo.cert
+      key: path/to/foo.key
+```
+
+```toml tab="File (TOML)"
+[metrics.openTelemetry.tls]
+  cert = "path/to/foo.cert"
+  key = "path/to/foo.key"
+```
+
+```bash tab="CLI"
+--metrics.openTelemetry.tls.cert=path/to/foo.cert
+--metrics.openTelemetry.tls.key=path/to/foo.key
+```
+
+##### `insecureSkipVerify`
+
+_Optional, Default=false_
+
+If `insecureSkipVerify` is `true`,
+the TLS connection to the OpenTelemetry Collector accepts any certificate presented by the server regardless of the hostnames it covers.
+
+```yaml tab="File (YAML)"
+metrics:
+  openTelemetry:
+    tls:
+      insecureSkipVerify: true
+```
+
+```toml tab="File (TOML)"
+[metrics.openTelemetry.tls]
+  insecureSkipVerify = true
+```
+
+```bash tab="CLI"
+--metrics.openTelemetry.tls.insecureSkipVerify=true
+```
+
+#### gRPC configuration
+
+This instructs the reporter to send metrics to the OpenTelemetry Collector using gRPC.
+
+```yaml tab="File (YAML)"
+metrics:
+  openTelemetry:
+    grpc: {}
+```
+
+```toml tab="File (TOML)"
+[metrics]
+  [metrics.openTelemetry.grpc]
+```
+
+```bash tab="CLI"
+--metrics.openTelemetry.grpc=true
+```

docs/content/observability/tracing/opentelemetry.md

@@ -0,0 +1,246 @@
+---
+title: "Traefik OpenTelemetry Documentation"
+description: "Traefik supports several tracing backends, including OpenTelemetry. Learn how to implement it for observability in Traefik Proxy. Read the technical documentation."
+---
+
+# OpenTelemetry
+
+To enable the OpenTelemetry tracer:
+
+```yaml tab="File (YAML)"
+tracing:
+  openTelemetry: {}
+```
+
+```toml tab="File (TOML)"
+[tracing]
+  [tracing.openTelemetry]
+```
+
+```bash tab="CLI"
+--tracing.openTelemetry=true
+```
+
+!!! info "The OpenTelemetry trace reporter will export traces to the collector using HTTP by default, see the [gRPC Section](#grpc-configuration) to use gRPC."
+
+!!! info "Trace sampling"
+
+	By default, the OpenTelemetry trace reporter will sample 100% of traces.
+	See [OpenTelemetry's SDK configuration](https://opentelemetry.io/docs/reference/specification/sdk-environment-variables/#general-sdk-configuration) to customize the sampling strategy.
+
+#### `address`
+
+_Required, Default="localhost:4318", Format="`<host>:<port>`"_
+
+Address of the OpenTelemetry Collector to send spans to.
+
+```yaml tab="File (YAML)"
+tracing:
+  openTelemetry:
+    address: localhost:4318
+```
+
+```toml tab="File (TOML)"
+[tracing]
+  [tracing.openTelemetry]
+    address = "localhost:4318"
+```
+
+```bash tab="CLI"
+--tracing.openTelemetry.address=localhost:4318
+```
+
+#### `headers`
+
+_Optional, Default={}_
+
+Additional headers sent with spans by the reporter to the OpenTelemetry Collector.
+
+```yaml tab="File (YAML)"
+tracing:
+  openTelemetry:
+    headers:
+      foo: bar
+      baz: buz
+```
+
+```toml tab="File (TOML)"
+[tracing]
+  [tracing.openTelemetry.headers]
+    foo = "bar"
+    baz = "buz"
+```
+
+```bash tab="CLI"
+--tracing.openTelemetry.headers.foo=bar --tracing.openTelemetry.headers.baz=buz
+```
+
+#### `insecure`
+
+_Optional, Default=false_
+
+Allows reporter to send spans to the OpenTelemetry Collector without using a secured protocol.
+
+```yaml tab="File (YAML)"
+tracing:
+  openTelemetry:
+    insecure: true
+```
+
+```toml tab="File (TOML)"
+[tracing]
+  [tracing.openTelemetry]
+    insecure = true
+```
+
+```bash tab="CLI"
+--tracing.openTelemetry.insecure=true
+```
+
+#### `path`
+
+_Required, Default="/v1/traces"_
+
+Allows to override the default URL path used for sending traces.
+This option has no effect when using gRPC transport.
+
+```yaml tab="File (YAML)"
+tracing:
+  openTelemetry:
+    path: /foo/v1/traces
+```
+
+```toml tab="File (TOML)"
+[tracing]
+  [tracing.openTelemetry]
+    path = "/foo/v1/traces"
+```
+
+```bash tab="CLI"
+--tracing.openTelemetry.path=/foo/v1/traces
+```
+
+#### `tls`
+
+_Optional_
+
+Defines the TLS configuration used by the reporter to send spans to the OpenTelemetry Collector.
+
+##### `ca`
+
+_Optional_
+
+`ca` is the path to the certificate authority used for the secure connection to the OpenTelemetry Collector,
+it defaults to the system bundle.
+
+```yaml tab="File (YAML)"
+tracing:
+  openTelemetry:
+    tls:
+      ca: path/to/ca.crt
+```
+
+```toml tab="File (TOML)"
+[tracing.openTelemetry.tls]
+  ca = "path/to/ca.crt"
+```
+
+```bash tab="CLI"
+--tracing.openTelemetry.tls.ca=path/to/ca.crt
+```
+
+##### `cert`
+
+_Optional_
+
+`cert` is the path to the public certificate used for the secure connection to the OpenTelemetry Collector.
+When using this option, setting the `key` option is required.
+
+```yaml tab="File (YAML)"
+tracing:
+  openTelemetry:
+    tls:
+      cert: path/to/foo.cert
+      key: path/to/foo.key
+```
+
+```toml tab="File (TOML)"
+[tracing.openTelemetry.tls]
+  cert = "path/to/foo.cert"
+  key = "path/to/foo.key"
+```
+
+```bash tab="CLI"
+--tracing.openTelemetry.tls.cert=path/to/foo.cert
+--tracing.openTelemetry.tls.key=path/to/foo.key
+```
+
+##### `key`
+
+_Optional_
+
+`key` is the path to the private key used for the secure connection to the OpenTelemetry Collector.
+When using this option, setting the `cert` option is required.
+
+```yaml tab="File (YAML)"
+tracing:
+  openTelemetry:
+    tls:
+      cert: path/to/foo.cert
+      key: path/to/foo.key
+```
+
+```toml tab="File (TOML)"
+[tracing.openTelemetry.tls]
+  cert = "path/to/foo.cert"
+  key = "path/to/foo.key"
+```
+
+```bash tab="CLI"
+--tracing.openTelemetry.tls.cert=path/to/foo.cert
+--tracing.openTelemetry.tls.key=path/to/foo.key
+```
+
+##### `insecureSkipVerify`
+
+_Optional, Default=false_
+
+If `insecureSkipVerify` is `true`,
+the TLS connection to the OpenTelemetry Collector accepts any certificate presented by the server regardless of the hostnames it covers.
+
+```yaml tab="File (YAML)"
+tracing:
+  openTelemetry:
+    tls:
+      insecureSkipVerify: true
+```
+
+```toml tab="File (TOML)"
+[tracing.openTelemetry.tls]
+  insecureSkipVerify = true
+```
+
+```bash tab="CLI"
+--tracing.openTelemetry.tls.insecureSkipVerify=true
+```
+
+#### gRPC configuration
+
+_Optional_
+
+This instructs the reporter to send spans to the OpenTelemetry Collector using gRPC.
+
+```yaml tab="File (YAML)"
+tracing:
+  openTelemetry:
+    grpc: {}
+```
+
+```toml tab="File (TOML)"
+[tracing]
+  [tracing.openTelemetry.grpc]
+```
+
+```bash tab="CLI"
+--tracing.openTelemetry.grpc=true
+```

docs/content/reference/static-configuration/cli-ref.md

@@ -357,6 +357,51 @@ InfluxDB v2 push interval. (Default: ```10```)
 `--metrics.influxdb2.token`:  
 InfluxDB v2 access token.
 
+`--metrics.opentelemetry`:  
+OpenTelemetry metrics exporter type. (Default: ```false```)
+
+`--metrics.opentelemetry.addentrypointslabels`:  
+Enable metrics on entry points. (Default: ```true```)
+
+`--metrics.opentelemetry.address`:  
+Address (host:port) of the collector endpoint. (Default: ```localhost:4318```)
+
+`--metrics.opentelemetry.addrouterslabels`:  
+Enable metrics on routers. (Default: ```false```)
+
+`--metrics.opentelemetry.addserviceslabels`:  
+Enable metrics on services. (Default: ```true```)
+
+`--metrics.opentelemetry.explicitboundaries`:  
+Boundaries for latency metrics. (Default: ```0.005000, 0.010000, 0.025000, 0.050000, 0.100000, 0.250000, 0.500000, 1.000000, 2.500000, 5.000000, 10.000000```)
+
+`--metrics.opentelemetry.grpc`:  
+gRPC specific configuration for the OpenTelemetry collector. (Default: ```true```)
+
+`--metrics.opentelemetry.headers.<name>`:  
+Headers sent with payload.
+
+`--metrics.opentelemetry.insecure`:  
+Disables client transport security for the exporter. (Default: ```false```)
+
+`--metrics.opentelemetry.path`:  
+Set the URL path of the collector endpoint.
+
+`--metrics.opentelemetry.pushinterval`:  
+Period between calls to collect a checkpoint. (Default: ```10```)
+
+`--metrics.opentelemetry.tls.ca`:  
+TLS CA
+
+`--metrics.opentelemetry.tls.cert`:  
+TLS cert
+
+`--metrics.opentelemetry.tls.insecureskipverify`:  
+TLS insecure skip verify (Default: ```false```)
+
+`--metrics.opentelemetry.tls.key`:  
+TLS key
+
 `--metrics.prometheus`:  
 Prometheus metrics exporter type. (Default: ```false```)
 
@@ -1095,6 +1140,36 @@ Sets the sampling type. (Default: ```const```)
 `--tracing.jaeger.tracecontextheadername`:  
 Sets the header name used to store the trace ID. (Default: ```uber-trace-id```)
 
+`--tracing.opentelemetry`:  
+Settings for OpenTelemetry. (Default: ```false```)
+
+`--tracing.opentelemetry.address`:  
+Sets the address (host:port) of the collector endpoint. (Default: ```localhost:4318```)
+
+`--tracing.opentelemetry.grpc`:  
+gRPC specific configuration for the OpenTelemetry collector. (Default: ```true```)
+
+`--tracing.opentelemetry.headers.<name>`:  
+Defines additional headers to be sent with the payloads.
+
+`--tracing.opentelemetry.insecure`:  
+Disables client transport security for the exporter. (Default: ```false```)
+
+`--tracing.opentelemetry.path`:  
+Sets the URL path of the collector endpoint.
+
+`--tracing.opentelemetry.tls.ca`:  
+TLS CA
+
+`--tracing.opentelemetry.tls.cert`:  
+TLS cert
+
+`--tracing.opentelemetry.tls.insecureskipverify`:  
+TLS insecure skip verify (Default: ```false```)
+
+`--tracing.opentelemetry.tls.key`:  
+TLS key
+
 `--tracing.servicename`:  
 Set the name for this service. (Default: ```traefik```)
 

docs/content/reference/static-configuration/env-ref.md

@@ -357,6 +357,51 @@ InfluxDB retention policy used when protocol is http.
 `TRAEFIK_METRICS_INFLUXDB_USERNAME`:  
 InfluxDB username (only with http).
 
+`TRAEFIK_METRICS_OPENTELEMETRY`:  
+OpenTelemetry metrics exporter type. (Default: ```false```)
+
+`TRAEFIK_METRICS_OPENTELEMETRY_ADDENTRYPOINTSLABELS`:  
+Enable metrics on entry points. (Default: ```true```)
+
+`TRAEFIK_METRICS_OPENTELEMETRY_ADDRESS`:  
+Address (host:port) of the collector endpoint. (Default: ```localhost:4318```)
+
+`TRAEFIK_METRICS_OPENTELEMETRY_ADDROUTERSLABELS`:  
+Enable metrics on routers. (Default: ```false```)
+
+`TRAEFIK_METRICS_OPENTELEMETRY_ADDSERVICESLABELS`:  
+Enable metrics on services. (Default: ```true```)
+
+`TRAEFIK_METRICS_OPENTELEMETRY_EXPLICITBOUNDARIES`:  
+Boundaries for latency metrics. (Default: ```0.005000, 0.010000, 0.025000, 0.050000, 0.100000, 0.250000, 0.500000, 1.000000, 2.500000, 5.000000, 10.000000```)
+
+`TRAEFIK_METRICS_OPENTELEMETRY_GRPC`:  
+gRPC specific configuration for the OpenTelemetry collector. (Default: ```true```)
+
+`TRAEFIK_METRICS_OPENTELEMETRY_HEADERS_<NAME>`:  
+Headers sent with payload.
+
+`TRAEFIK_METRICS_OPENTELEMETRY_INSECURE`:  
+Disables client transport security for the exporter. (Default: ```false```)
+
+`TRAEFIK_METRICS_OPENTELEMETRY_PATH`:  
+Set the URL path of the collector endpoint.
+
+`TRAEFIK_METRICS_OPENTELEMETRY_PUSHINTERVAL`:  
+Period between calls to collect a checkpoint. (Default: ```10```)
+
+`TRAEFIK_METRICS_OPENTELEMETRY_TLS_CA`:  
+TLS CA
+
+`TRAEFIK_METRICS_OPENTELEMETRY_TLS_CERT`:  
+TLS cert
+
+`TRAEFIK_METRICS_OPENTELEMETRY_TLS_INSECURESKIPVERIFY`:  
+TLS insecure skip verify (Default: ```false```)
+
+`TRAEFIK_METRICS_OPENTELEMETRY_TLS_KEY`:  
+TLS key
+
 `TRAEFIK_METRICS_PROMETHEUS`:  
 Prometheus metrics exporter type. (Default: ```false```)
 
@@ -1095,6 +1140,36 @@ Sets the sampling type. (Default: ```const```)
 `TRAEFIK_TRACING_JAEGER_TRACECONTEXTHEADERNAME`:  
 Sets the header name used to store the trace ID. (Default: ```uber-trace-id```)
 
+`TRAEFIK_TRACING_OPENTELEMETRY`:  
+Settings for OpenTelemetry. (Default: ```false```)
+
+`TRAEFIK_TRACING_OPENTELEMETRY_ADDRESS`:  
+Sets the address (host:port) of the collector endpoint. (Default: ```localhost:4318```)
+
+`TRAEFIK_TRACING_OPENTELEMETRY_GRPC`:  
+gRPC specific configuration for the OpenTelemetry collector. (Default: ```true```)
+
+`TRAEFIK_TRACING_OPENTELEMETRY_HEADERS_<NAME>`:  
+Defines additional headers to be sent with the payloads.
+
+`TRAEFIK_TRACING_OPENTELEMETRY_INSECURE`:  
+Disables client transport security for the exporter. (Default: ```false```)
+
+`TRAEFIK_TRACING_OPENTELEMETRY_PATH`:  
+Sets the URL path of the collector endpoint.
+
+`TRAEFIK_TRACING_OPENTELEMETRY_TLS_CA`:  
+TLS CA
+
+`TRAEFIK_TRACING_OPENTELEMETRY_TLS_CERT`:  
+TLS cert
+
+`TRAEFIK_TRACING_OPENTELEMETRY_TLS_INSECURESKIPVERIFY`:  
+TLS insecure skip verify (Default: ```false```)
+
+`TRAEFIK_TRACING_OPENTELEMETRY_TLS_KEY`:  
+TLS key
+
 `TRAEFIK_TRACING_SERVICENAME`:  
 Set the name for this service. (Default: ```traefik```)
 

docs/content/reference/static-configuration/file.toml

@@ -307,6 +307,25 @@
     [metrics.influxDB2.additionalLabels]
       name0 = "foobar"
       name1 = "foobar"
+  [metrics.openTelemetry]
+    address = "foobar"
+    addEntryPointsLabels = true
+    addRoutersLabels = true
+    addServicesLabels = true
+    pushInterval = "42s"
+    path = "foobar"
+    explicitBoundaries =  [42.0, 42.0]
+    insecure = true
+    [metrics.openTelemetry.headers]
+      name0 = "foobar"
+      name1 = "foobar"
+    [metrics.openTelemetry.tls]
+      ca = "foobar"
+      caOptional = true
+      cert = "foobar"
+      insecureSkipVerify = true
+      key = "foobar"
+    [metrics.openTelemetry.grpc]
 
 [ping]
   entryPoint = "foobar"
@@ -391,6 +410,20 @@
     serverURL = "foobar"
     secretToken = "foobar"
     serviceEnvironment = "foobar"
+  [tracing.openTelemetry]
+    address = "foobar"
+    insecure = true
+    path = "foobar"
+    [tracing.openTelemetry.headers]
+      name0 = "foobar"
+      name1 = "foobar"
+    [tracing.openTelemetry.tls]
+      ca = "foobar"
+      caOptional = true
+      cert = "foobar"
+      key = "foobar"
+      insecureSkipVerify = true
+    [tracing.openTelemetry.grpc]
 
 [hostResolver]
   cnameFlattening = true

docs/content/reference/static-configuration/file.yaml

@@ -335,6 +335,28 @@ metrics:
     additionalLabels:
       name0: foobar
       name1: foobar
+  openTelemetry:
+    address: foobar
+    addEntryPointsLabels: true
+    addRoutersLabels: true
+    addServicesLabels: true
+    explicitBoundaries:
+      - 42
+      - 42
+    headers:
+      name0: foobar
+      name1: foobar
+    insecure: true
+    path: foobar
+    pushInterval: 42s
+    tls:
+      ca: foobar
+      caOptional: true
+      cert: foobar
+      insecureSkipVerify: true
+      key: foobar
+    grpc: {}
+
 ping:
   entryPoint: foobar
   manualRouting: true
@@ -417,6 +439,20 @@ tracing:
     serverURL: foobar
     secretToken: foobar
     serviceEnvironment: foobar
+  openTelemetry:
+    address: foobar
+    headers:
+      name0: foobar
+      name1: foobar
+    insecure: true
+    path: foobar
+    tls:
+      ca: foobar
+      caOptional: true
+      cert: foobar
+      key: foobar
+      insecureSkipVerify: true
+    grpc: {}
 hostResolver:
   cnameFlattening: true
   resolvConfig: foobar

docs/mkdocs.yml

@@ -157,6 +157,7 @@ nav:
           - 'Datadog': 'observability/metrics/datadog.md'
           - 'InfluxDB': 'observability/metrics/influxdb.md'
           - 'InfluxDB2': 'observability/metrics/influxdb2.md'
+          - 'OpenTelemetry': 'observability/metrics/opentelemetry.md'
           - 'Prometheus': 'observability/metrics/prometheus.md'
           - 'StatsD': 'observability/metrics/statsd.md'
       - 'Tracing':
@@ -167,6 +168,7 @@ nav:
           - 'Instana': 'observability/tracing/instana.md'
           - 'Haystack': 'observability/tracing/haystack.md'
           - 'Elastic': 'observability/tracing/elastic.md'
+          - 'OpenTelemetry': 'observability/tracing/opentelemetry.md'
   - 'User Guides':
       - 'Kubernetes and Let''s Encrypt': 'user-guides/crd-acme/index.md'
       - 'gRPC Examples': 'user-guides/grpc.md'

go.mod

@@ -47,7 +47,7 @@ require (
 	github.com/lucas-clemente/quic-go v0.28.1
 	github.com/mailgun/ttlmap v0.0.0-20170619185759-c1c17f74874f
 	github.com/miekg/dns v1.1.50
-	github.com/mitchellh/copystructure v1.0.0
+	github.com/mitchellh/copystructure v1.2.0
 	github.com/mitchellh/hashstructure v1.0.0
 	github.com/mitchellh/mapstructure v1.5.0
 	github.com/natefinch/lumberjack v0.0.0-20201021141957-47ffae23317c
@@ -77,33 +77,45 @@ require (
 	github.com/vulcand/predicate v1.2.0
 	go.elastic.co/apm v1.13.1
 	go.elastic.co/apm/module/apmot v1.13.1
+	go.opentelemetry.io/collector/pdata v0.64.1
+	go.opentelemetry.io/otel v1.11.1
+	go.opentelemetry.io/otel/bridge/opentracing v1.11.1
+	go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc v0.33.0
+	go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetrichttp v0.33.0
+	go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.11.1
+	go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc v1.11.1
+	go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp v1.11.1
+	go.opentelemetry.io/otel/metric v0.33.0
+	go.opentelemetry.io/otel/sdk v1.11.1
+	go.opentelemetry.io/otel/sdk/metric v0.33.0
+	go.opentelemetry.io/otel/trace v1.11.1
 	golang.org/x/exp v0.0.0-20221114191408-850992195362
 	golang.org/x/mod v0.6.0
 	golang.org/x/net v0.1.0
 	golang.org/x/text v0.4.0
-	golang.org/x/time v0.0.0-20220224211638-0e9765cccd65
+	golang.org/x/time v0.0.0-20220609170525-579cf78fd858
 	golang.org/x/tools v0.2.0
-	google.golang.org/grpc v1.46.0
+	google.golang.org/grpc v1.50.1
 	gopkg.in/DataDog/dd-trace-go.v1 v1.43.1
 	gopkg.in/fsnotify.v1 v1.4.7
 	gopkg.in/yaml.v3 v3.0.1
-	k8s.io/api v0.22.1
+	k8s.io/api v0.25.0
-	k8s.io/apiextensions-apiserver v0.21.3
+	k8s.io/apiextensions-apiserver v0.25.0
-	k8s.io/apimachinery v0.22.1
+	k8s.io/apimachinery v0.25.0
-	k8s.io/client-go v0.22.1
+	k8s.io/client-go v0.25.0
-	k8s.io/utils v0.0.0-20210820185131-d34e5cb4466e
+	k8s.io/utils v0.0.0-20220728103510-ee6ede2d64ed
 	mvdan.cc/xurls/v2 v2.1.0
 	sigs.k8s.io/gateway-api v0.4.0
 )
 
 require (
-	cloud.google.com/go v0.81.0 // indirect
+	cloud.google.com/go v0.97.0 // indirect
 	github.com/AlecAivazis/survey/v2 v2.2.3 // indirect
 	github.com/Azure/azure-sdk-for-go v40.3.0+incompatible // indirect
 	github.com/Azure/go-ansiterm v0.0.0-20210617225240-d185dfc1b5a1 // indirect
 	github.com/Azure/go-autorest v14.2.0+incompatible // indirect
-	github.com/Azure/go-autorest/autorest v0.11.24 // indirect
+	github.com/Azure/go-autorest/autorest v0.11.27 // indirect
-	github.com/Azure/go-autorest/autorest/adal v0.9.18 // indirect
+	github.com/Azure/go-autorest/autorest/adal v0.9.20 // indirect
 	github.com/Azure/go-autorest/autorest/azure/auth v0.5.11 // indirect
 	github.com/Azure/go-autorest/autorest/azure/cli v0.4.5 // indirect
 	github.com/Azure/go-autorest/autorest/date v0.3.0 // indirect
@@ -121,6 +133,8 @@ require (
 	github.com/Microsoft/go-winio v0.5.2 // indirect
 	github.com/Microsoft/hcsshim v0.8.23 // indirect
 	github.com/OpenDNS/vegadns2client v0.0.0-20180418235048-a3fa4a771d87 // indirect
+	github.com/PuerkitoBio/purell v1.1.1 // indirect
+	github.com/PuerkitoBio/urlesc v0.0.0-20170810143723-de5bf2ad4578 // indirect
 	github.com/Shopify/sarama v1.23.1 // indirect
 	github.com/VividCortex/gohistogram v1.0.0 // indirect
 	github.com/agl/ed25519 v0.0.0-20170116200512-5312a6153412 // indirect
@@ -165,7 +179,8 @@ require (
 	github.com/elastic/go-licenser v0.3.1 // indirect
 	github.com/elastic/go-sysinfo v1.1.1 // indirect
 	github.com/elastic/go-windows v1.0.0 // indirect
-	github.com/evanphx/json-patch v4.11.0+incompatible // indirect
+	github.com/emicklei/go-restful/v3 v3.8.0 // indirect
+	github.com/evanphx/json-patch v4.12.0+incompatible // indirect
 	github.com/exoscale/egoscale v0.90.0 // indirect
 	github.com/fatih/color v1.13.0 // indirect
 	github.com/fsnotify/fsnotify v1.5.4 // indirect
@@ -173,7 +188,11 @@ require (
 	github.com/ghodss/yaml v1.0.0 // indirect
 	github.com/go-errors/errors v1.0.1 // indirect
 	github.com/go-logfmt/logfmt v0.5.1 // indirect
-	github.com/go-logr/logr v0.4.0 // indirect
+	github.com/go-logr/logr v1.2.3 // indirect
+	github.com/go-logr/stdr v1.2.2 // indirect
+	github.com/go-openapi/jsonpointer v0.19.5 // indirect
+	github.com/go-openapi/jsonreference v0.19.5 // indirect
+	github.com/go-openapi/swag v0.19.14 // indirect
 	github.com/go-redis/redis/v8 v8.11.5 // indirect
 	github.com/go-resty/resty/v2 v2.1.1-0.20191201195748-d7b97669fe48 // indirect
 	github.com/go-task/slim-sprig v0.0.0-20210107165309-348f09dbbbc0 // indirect
@@ -182,21 +201,22 @@ require (
 	github.com/gogo/googleapis v1.4.0 // indirect
 	github.com/gogo/protobuf v1.3.2 // indirect
 	github.com/golang-jwt/jwt/v4 v4.2.0 // indirect
-	github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b // indirect
+	github.com/golang/glog v1.0.0 // indirect
 	github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da // indirect
 	github.com/golang/mock v1.6.0 // indirect
 	github.com/google/btree v1.0.1 // indirect
-	github.com/google/go-cmp v0.5.8 // indirect
+	github.com/google/gnostic v0.5.7-v3refs // indirect
+	github.com/google/go-cmp v0.5.9 // indirect
 	github.com/google/go-querystring v1.1.0 // indirect
 	github.com/google/gofuzz v1.2.0 // indirect
 	github.com/google/shlex v0.0.0-20191202100458-e7afc7fbc510 // indirect
 	github.com/google/uuid v1.3.0 // indirect
-	github.com/googleapis/gax-go/v2 v2.0.5 // indirect
+	github.com/googleapis/gax-go/v2 v2.1.0 // indirect
-	github.com/googleapis/gnostic v0.5.5 // indirect
 	github.com/gophercloud/gophercloud v1.0.0 // indirect
 	github.com/gophercloud/utils v0.0.0-20210216074907-f6de111f2eae // indirect
 	github.com/gravitational/trace v1.1.16-0.20220114165159-14a9a7dd6aaf // indirect
-	github.com/grpc-ecosystem/go-grpc-middleware v1.2.2 // indirect
+	github.com/grpc-ecosystem/go-grpc-middleware v1.3.0 // indirect
+	github.com/grpc-ecosystem/grpc-gateway/v2 v2.7.0 // indirect
 	github.com/grpc-ecosystem/grpc-opentracing v0.0.0-20180507213350-8e809c8a8645 // indirect
 	github.com/hashicorp/consul/sdk v0.10.0 // indirect
 	github.com/hashicorp/cronexpr v1.1.1 // indirect
@@ -237,6 +257,7 @@ require (
 	github.com/liquidweb/liquidweb-cli v0.6.9 // indirect
 	github.com/liquidweb/liquidweb-go v1.6.3 // indirect
 	github.com/looplab/fsm v0.1.0 // indirect
+	github.com/magiconair/properties v1.8.6 // indirect
 	github.com/mailgun/minheap v0.0.0-20170619185613-3dbe6c6bf55f // indirect
 	github.com/mailgun/multibuf v0.1.2 // indirect
 	github.com/mailgun/timetools v0.0.0-20141028012446-7e6055773c51 // indirect
@@ -256,7 +277,7 @@ require (
 	github.com/mitchellh/go-homedir v1.1.0 // indirect
 	github.com/mitchellh/go-ps v1.0.0 // indirect
 	github.com/mitchellh/go-testing-interface v1.14.1 // indirect
-	github.com/mitchellh/reflectwalk v1.0.1 // indirect
+	github.com/mitchellh/reflectwalk v1.0.2 // indirect
 	github.com/moby/buildkit v0.8.2-0.20210401015549-df49b648c8bf // indirect
 	github.com/moby/locker v1.0.1 // indirect
 	github.com/moby/sys/mount v0.2.0 // indirect
@@ -265,6 +286,7 @@ require (
 	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
 	github.com/modern-go/reflect2 v1.0.2 // indirect
 	github.com/morikuni/aec v1.0.0 // indirect
+	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
 	github.com/namedotcom/go v0.0.0-20180403034216-08470befbe04 // indirect
 	github.com/nrdcg/auroradns v1.1.0 // indirect
 	github.com/nrdcg/desec v0.6.0 // indirect
@@ -300,7 +322,7 @@ require (
 	github.com/softlayer/softlayer-go v1.0.6 // indirect
 	github.com/softlayer/xmlrpc v0.0.0-20200409220501-5f089df7cb7e // indirect
 	github.com/spf13/cast v1.3.1 // indirect
-	github.com/spf13/cobra v1.2.1 // indirect
+	github.com/spf13/cobra v1.4.0 // indirect
 	github.com/spf13/pflag v1.0.5 // indirect
 	github.com/stretchr/objx v0.5.0 // indirect
 	github.com/tencentcloud/tencentcloud-sdk-go/tencentcloud/common v1.0.490 // indirect
@@ -325,10 +347,13 @@ require (
 	go.etcd.io/etcd/client/pkg/v3 v3.5.4 // indirect
 	go.etcd.io/etcd/client/v3 v3.5.4 // indirect
 	go.opencensus.io v0.23.0 // indirect
-	go.uber.org/atomic v1.7.0 // indirect
+	go.opentelemetry.io/otel/exporters/otlp/internal/retry v1.11.1 // indirect
-	go.uber.org/multierr v1.6.0 // indirect
+	go.opentelemetry.io/otel/exporters/otlp/otlpmetric v0.33.0 // indirect
+	go.opentelemetry.io/proto/otlp v0.19.0 // indirect
+	go.uber.org/atomic v1.9.0 // indirect
+	go.uber.org/multierr v1.8.0 // indirect
 	go.uber.org/ratelimit v0.2.0 // indirect
-	go.uber.org/zap v1.18.1 // indirect
+	go.uber.org/zap v1.21.0 // indirect
 	go4.org/intern v0.0.0-20211027215823-ae77deb06f29 // indirect
 	go4.org/unsafe/assume-no-moving-gc v0.0.0-20220617031537-928513b29760 // indirect
 	golang.org/x/crypto v0.1.0 // indirect
@@ -338,10 +363,10 @@ require (
 	golang.org/x/sys v0.1.0 // indirect
 	golang.org/x/term v0.1.0 // indirect
 	golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 // indirect
-	google.golang.org/api v0.44.0 // indirect
+	google.golang.org/api v0.57.0 // indirect
 	google.golang.org/appengine v1.6.7 // indirect
-	google.golang.org/genproto v0.0.0-20211021150943-2b146023228c // indirect
+	google.golang.org/genproto v0.0.0-20220502173005-c8bf987b8c21 // indirect
-	google.golang.org/protobuf v1.28.0 // indirect
+	google.golang.org/protobuf v1.28.1 // indirect
 	gopkg.in/inf.v0 v0.9.1 // indirect
 	gopkg.in/ini.v1 v1.66.6 // indirect
 	gopkg.in/ns1/ns1-go.v2 v2.6.5 // indirect
@@ -350,11 +375,12 @@ require (
 	gopkg.in/yaml.v2 v2.4.0 // indirect
 	howett.net/plist v0.0.0-20181124034731-591f970eefbb // indirect
 	inet.af/netaddr v0.0.0-20220617031823-097006376321 // indirect
-	k8s.io/klog/v2 v2.10.0 // indirect
+	k8s.io/klog/v2 v2.70.1 // indirect
-	k8s.io/kube-openapi v0.0.0-20210421082810-95288971da7e // indirect
+	k8s.io/kube-openapi v0.0.0-20220803162953-67bda5d908f1 // indirect
 	nhooyr.io/websocket v1.8.7 // indirect
-	sigs.k8s.io/structured-merge-diff/v4 v4.1.2 // indirect
+	sigs.k8s.io/json v0.0.0-20220713155537-f223a00ba0e2 // indirect
-	sigs.k8s.io/yaml v1.2.0 // indirect
+	sigs.k8s.io/structured-merge-diff/v4 v4.2.3 // indirect
+	sigs.k8s.io/yaml v1.3.0 // indirect
 )
 
 // Containous forks
@@ -371,3 +397,5 @@ replace github.com/jaguilar/vt100 => github.com/tonistiigi/vt100 v0.0.0-20190402
 // ambiguous import: found package github.com/tencentcloud/tencentcloud-sdk-go/tencentcloud/common/http in multiple modules
 // tencentcloud uses monorepo with multimodule but the go.mod files are incomplete.
 exclude github.com/tencentcloud/tencentcloud-sdk-go v3.0.83+incompatible
+
+// replace github.com/go-logr/logr => github.com/go-logr/logr v0.4.0

go.sum

@@ -24,8 +24,15 @@ cloud.google.com/go v0.72.0/go.mod h1:M+5Vjvlc2wnp6tjzE102Dw08nGShTscUx2nZMufOKP
 cloud.google.com/go v0.74.0/go.mod h1:VV1xSbzvo+9QJOxLDaJfTjx5e+MePCpCWwvftOeQmWk=
 cloud.google.com/go v0.78.0/go.mod h1:QjdrLG0uq+YwhjoVOLsS1t7TW8fs36kLs4XO5R5ECHg=
 cloud.google.com/go v0.79.0/go.mod h1:3bzgcEeQlzbuEAYu4mrWhKqWjmpprinYgKJLgKHnbb8=
-cloud.google.com/go v0.81.0 h1:at8Tk2zUz63cLPR0JPWm5vp77pEZmzxEQBEfRKn1VV8=
 cloud.google.com/go v0.81.0/go.mod h1:mk/AM35KwGk/Nm2YSeZbxXdrNK3KZOYHmLkOqC2V6E0=
+cloud.google.com/go v0.83.0/go.mod h1:Z7MJUsANfY0pYPdw0lbnivPx4/vhy/e2FEkSkF7vAVY=
+cloud.google.com/go v0.84.0/go.mod h1:RazrYuxIK6Kb7YrzzhPoLmCVzl7Sup4NrbKPg8KHSUM=
+cloud.google.com/go v0.87.0/go.mod h1:TpDYlFy7vuLzZMMZ+B6iRiELaY7z/gJPaqbMx6mlWcY=
+cloud.google.com/go v0.90.0/go.mod h1:kRX0mNRHe0e2rC6oNakvwQqzyDmg57xJ+SZU1eT2aDQ=
+cloud.google.com/go v0.93.3/go.mod h1:8utlLll2EF5XMAV15woO4lSbWQlk8rer9aLOfLh7+YI=
+cloud.google.com/go v0.94.1/go.mod h1:qAlAugsXlC+JWO+Bke5vCtc9ONxjQT3drlTTnAplMW4=
+cloud.google.com/go v0.97.0 h1:3DXvAyifywvq64LfkKaMOmkWPS1CikIQdMe2lY9vxU8=
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@@ -70,8 +77,9 @@ github.com/Azure/go-autorest/autorest v0.10.0/go.mod h1:/FALq9T/kS7b5J5qsQ+RSTUd
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@@ -79,8 +87,9 @@ github.com/Azure/go-autorest/autorest/adal v0.8.2/go.mod h1:ZjhuQClTqx435SRJ2iMl
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@@ -95,8 +104,9 @@ github.com/Azure/go-autorest/autorest/mocks v0.1.0/go.mod h1:OTyCOPRA2IgIlWxVYxB
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@@ -175,8 +185,10 @@ github.com/OneOfOne/xxhash v1.2.2/go.mod h1:HSdplMjZKSmBqAxg5vPj2TmRDmfkzw+cTzAE
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@@ -480,6 +492,7 @@ github.com/cpu/goacmedns v0.1.1/go.mod h1:MuaouqEhPAHxsbqjgnck5zeghuwBP1dLnPoobe
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@@ -608,6 +621,8 @@ github.com/elazarl/goproxy v0.0.0-20191011121108-aa519ddbe484/go.mod h1:Ro8st/El
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@@ -624,8 +639,9 @@ github.com/erikstmartin/go-testdb v0.0.0-20160219214506-8d10e4a1bae5/go.mod h1:a
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@@ -695,17 +711,24 @@ github.com/go-logfmt/logfmt v0.5.1 h1:otpy5pqBCBZ1ng9RQ0dPu4PN7ba75Y/aA+UpowDyNV
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@@ -713,6 +736,7 @@ github.com/go-openapi/spec v0.19.5/go.mod h1:Hm2Jr4jv8G1ciIAo+frC/Ft+rR2kQDh8JHK
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@@ -784,8 +808,9 @@ github.com/golang-jwt/jwt/v4 v4.1.0/go.mod h1:/xlHOz8bRuivTWchD4jCa+NbatV+wEUSzw
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@@ -826,6 +851,7 @@ github.com/golang/protobuf v1.5.2 h1:ROPKBNFfQgOUMifHyP+KYbvpjbdoFNs+aK7DXlji0Tw
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@@ -849,8 +877,8 @@ github.com/google/go-cmp v0.5.4/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/
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@@ -869,6 +897,7 @@ github.com/google/gofuzz v1.2.0/go.mod h1:dBl0BpW6vV/+mYPU4Po3pmUjxk6FQPldtuIdl/
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@@ -882,6 +911,8 @@ github.com/google/pprof v0.0.0-20210122040257-d980be63207e/go.mod h1:kpwsk12EmLe
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@@ -895,15 +926,15 @@ github.com/google/uuid v1.3.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+
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@@ -929,13 +960,16 @@ github.com/gregjones/httpcache v0.0.0-20180305231024-9cad4c3443a7/go.mod h1:Fecb
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@@ -1249,8 +1283,9 @@ github.com/lyft/protoc-gen-validate v0.0.13/go.mod h1:XbGvPuh87YZc5TdIa2/I4pLk0Q
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@@ -1326,8 +1361,9 @@ github.com/mimuret/golang-iij-dpf v0.7.1/go.mod h1:IXWYcQVIHYzuM+W7kDWX0mseHDfUo
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@@ -1358,8 +1394,9 @@ github.com/mitchellh/osext v0.0.0-20151018003038-5e2d6d41470f/go.mod h1:OkQIRizQ
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@@ -1393,6 +1430,7 @@ github.com/mreiferson/go-httpclient v0.0.0-20160630210159-31f0106b4474/go.mod h1
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@@ -1456,6 +1494,7 @@ github.com/onsi/ginkgo v1.16.5 h1:8xi0RTUf59SOSfEtZMvwTvXYMzG4gV23XVHOZiXNtnE=
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@@ -1751,8 +1790,9 @@ github.com/spf13/cobra v0.0.5/go.mod h1:3K3wKZymM7VvHMDS9+Akkh4K60UwM26emMESw8tL
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@@ -1956,26 +1996,60 @@ go.opencensus.io v0.22.4/go.mod h1:yxeiOL68Rb0Xd1ddK5vPZ/oVn4vY4Ynel7k9FzqtOIw=
 go.opencensus.io v0.22.5/go.mod h1:5pWMHQbX5EPX2/62yrJeAkowc+lfs/XD7Uxpq3pI6kk=
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@@ -2139,6 +2213,7 @@ golang.org/x/net v0.0.0-20210316092652-d523dce5a7f4/go.mod h1:RBQZq4jEuRlivfhVLd
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@@ -2167,6 +2242,10 @@ golang.org/x/oauth2 v0.0.0-20210220000619-9bb904979d93/go.mod h1:KelEdhl1UZF7XfJ
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@@ -2297,12 +2376,16 @@ golang.org/x/sys v0.0.0-20210403161142-5e06dd20ab57/go.mod h1:h1NjWce9XRLGQEsW7w
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@@ -2341,8 +2424,8 @@ golang.org/x/time v0.0.0-20200630173020-3af7569d3a1e/go.mod h1:tRJNPiyCQ0inRvYxb
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@@ -2416,6 +2499,8 @@ golang.org/x/tools v0.0.0-20210114065538-d78b04bdf963/go.mod h1:emZCQorbCU4vsT4f
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@@ -2458,8 +2543,15 @@ google.golang.org/api v0.36.0/go.mod h1:+z5ficQTmoYpPn8LCUNVpK5I7hwkpjbcgqA7I34q
 google.golang.org/api v0.40.0/go.mod h1:fYKFpnQN0DsDSKRVRcQSDQNtqWPfM9i+zNPxepjRCQ8=
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-google.golang.org/api v0.44.0 h1:URs6qR1lAxDsqWITsQXI4ZkGiYJ5dHtRNiCpfs2OeKA=
 google.golang.org/api v0.44.0/go.mod h1:EBOGZqzyhtvMDoxwS97ctnh0zUmYY6CxqXsc1AvkYD8=
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 google.golang.org/appengine v1.2.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=
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@@ -2526,9 +2618,25 @@ google.golang.org/genproto v0.0.0-20210303154014-9728d6b83eeb/go.mod h1:FWY/as6D
 google.golang.org/genproto v0.0.0-20210310155132-4ce2db91004e/go.mod h1:FWY/as6DDZQgahTzZj3fqbO1CbirC29ZNUFHwi0/+no=
 google.golang.org/genproto v0.0.0-20210319143718-93e7006c17a6/go.mod h1:FWY/as6DDZQgahTzZj3fqbO1CbirC29ZNUFHwi0/+no=
 google.golang.org/genproto v0.0.0-20210402141018-6c239bbf2bb1/go.mod h1:9lPAdzaEmUacj36I+k7YKbEc5CXzPIeORRgDAUOu28A=
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 google.golang.org/genproto v0.0.0-20210602131652-f16073e35f0c/go.mod h1:UODoCrxHCcBojKKwX1terBiRUaqAsFqJiF615XL43r0=
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 google.golang.org/grpc v0.0.0-20160317175043-d3ddb4469d5a/go.mod h1:yo6s7OP7yaDglbqo1J04qKzAhqBH6lvTonzMVmEdcZw=
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@@ -2559,11 +2667,18 @@ google.golang.org/grpc v1.34.0/go.mod h1:WotjhfgOW/POjDeRt8vscBtXq+2VjORFy659qA5
 google.golang.org/grpc v1.35.0/go.mod h1:qjiiYl8FncCW8feJPdyg3v6XW24KsRHe+dy9BAGRRjU=
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-google.golang.org/grpc v1.46.0 h1:oCjezcn6g6A75TGoKYBPgKmVBLexhYLM6MebdrPApP8=
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 google.golang.org/grpc/examples v0.0.0-20201130180447-c456688b1860/go.mod h1:Ly7ZA/ARzg8fnPU9TyZIxoz33sEUuWX7txiqs8lPTgE=
 google.golang.org/protobuf v0.0.0-20200109180630-ec00e32a8dfd/go.mod h1:DFci5gLYBciE7Vtevhsrf46CRTquxDuWsQurQQe4oz8=
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@@ -2578,8 +2693,9 @@ google.golang.org/protobuf v1.25.0/go.mod h1:9JNX74DMeImyA3h4bdi1ymwjUzf21/xIlba
 google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp09yW+WbY/TyQbw=
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 google.golang.org/protobuf v1.27.1/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
-google.golang.org/protobuf v1.28.0 h1:w43yiav+6bVFTBQFZX0r7ipe9JQ1QsbMgHwbBziscLw=
 google.golang.org/protobuf v1.28.0/go.mod h1:HV8QOd/L58Z+nl8r43ehVNZIU/HEI6OcFqwMG9pJV4I=
+google.golang.org/protobuf v1.28.1 h1:d0NfwRgPtno5B1Wa6L2DAG+KivqkdutMf1UhdNx175w=
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 gopkg.in/DataDog/dd-trace-go.v1 v1.43.1 h1:Dez4VzRQWAI5YXJRBx58BiC0gONGuW/oY4l8fWKzOXY=
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@@ -2677,10 +2793,12 @@ k8s.io/api v0.20.4/go.mod h1:++lNL1AJMkDymriNniQsWRkMDzRaX2Y/POTUi8yvqYQ=
 k8s.io/api v0.20.6/go.mod h1:X9e8Qag6JV/bL5G6bU8sdVRltWKmdHsFUGS3eVndqE8=
 k8s.io/api v0.21.0/go.mod h1:+YbrhBBGgsxbF6o6Kj4KJPJnBmAKuXDeS3E18bgHNVU=
 k8s.io/api v0.21.3/go.mod h1:hUgeYHUbBp23Ue4qdX9tR8/ANi/g3ehylAqDn9NWVOg=
-k8s.io/api v0.22.1 h1:ISu3tD/jRhYfSW8jI/Q1e+lRxkR7w9UwQEZ7FgslrwY=
 k8s.io/api v0.22.1/go.mod h1:bh13rkTp3F1XEaLGykbyRD2QaTTzPm0e/BMd8ptFONY=
-k8s.io/apiextensions-apiserver v0.21.3 h1:+B6biyUWpqt41kz5x6peIsljlsuwvNAp/oFax/j2/aY=
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 k8s.io/apimachinery v0.0.0-20180904193909-def12e63c512/go.mod h1:ccL7Eh7zubPUSh9A3USN90/OzHNSVN6zxzde07TDCL0=
 k8s.io/apimachinery v0.0.0-20190806215851-162a2dabc72f/go.mod h1:+ntn62igV2hyNj7/0brOvXSMONE2KxcePkSxK7/9FFQ=
 k8s.io/apimachinery v0.0.0-20191004115801-a2eda9f80ab8/go.mod h1:llRdnznGEAqC3DcNm6yEj472xaFVfLM7hnYofMb12tQ=
@@ -2690,8 +2808,9 @@ k8s.io/apimachinery v0.20.4/go.mod h1:WlLqWAHZGg07AeltaI0MV5uk1Omp8xaN0JGLY6gkRp
 k8s.io/apimachinery v0.20.6/go.mod h1:ejZXtW1Ra6V1O5H8xPBGz+T3+4gfkTCeExAHKU57MAc=
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-k8s.io/apimachinery v0.22.1 h1:DTARnyzmdHMz7bFWFDDm22AM4pLWTQECMpRTFu2d2OM=
 k8s.io/apimachinery v0.22.1/go.mod h1:O3oNtNadZdeOMxHFVxOreoznohCpy0z6mocxbZr7oJ0=
+k8s.io/apimachinery v0.25.0 h1:MlP0r6+3XbkUG2itd6vp3oxbtdQLQI94fD5gCS+gnoU=
+k8s.io/apimachinery v0.25.0/go.mod h1:qMx9eAk0sZQGsXGu86fab8tZdffHbwUfsvzqKn4mfB0=
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 k8s.io/apiserver v0.20.4/go.mod h1:Mc80thBKOyy7tbvFtB4kJv1kbdD0eIH8k8vianJcbFM=
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@@ -2704,8 +2823,9 @@ k8s.io/client-go v0.20.4/go.mod h1:LiMv25ND1gLUdBeYxBIwKpkSC5IsozMMmOOeSJboP+k=
 k8s.io/client-go v0.20.6/go.mod h1:nNQMnOvEUEsOzRRFIIkdmYOjAZrC8bgq0ExboWSU1I0=
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-k8s.io/client-go v0.22.1 h1:jW0ZSHi8wW260FvcXHkIa0NLxFBQszTlhiAVsU5mopw=
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@@ -2731,23 +2851,26 @@ k8s.io/klog/v2 v2.2.0/go.mod h1:Od+F08eJP+W3HUb4pSrPpgp9DGU4GzlpG/TmITuYh/Y=
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-k8s.io/klog/v2 v2.10.0 h1:R2HDMDJsHVTHA2n4RjwbeYXdOcBymXdX/JRb1v0VGhE=
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+k8s.io/kube-openapi v0.0.0-20220803162953-67bda5d908f1/go.mod h1:C/N6wCaBHeBHkHUesQOQy2/MZqGgMAFPqGsGQLdbZBU=
 k8s.io/kubernetes v1.11.10/go.mod h1:ocZa8+6APFNC2tX1DZASIbocyYT5jHzqFVsY5aoB7Jk=
 k8s.io/kubernetes v1.13.0/go.mod h1:ocZa8+6APFNC2tX1DZASIbocyYT5jHzqFVsY5aoB7Jk=
 k8s.io/utils v0.0.0-20190801114015-581e00157fb1/go.mod h1:sZAwmy6armz5eXlNoLmJcl4F1QuKu7sr+mFQ0byX7Ew=
 k8s.io/utils v0.0.0-20201110183641-67b214c5f920/go.mod h1:jPW/WVKK9YHAvNhRxK0md/EJ228hCsBRufyofKtW8HA=
 k8s.io/utils v0.0.0-20210707171843-4b05e18ac7d9/go.mod h1:jPW/WVKK9YHAvNhRxK0md/EJ228hCsBRufyofKtW8HA=
 k8s.io/utils v0.0.0-20210722164352-7f3ee0f31471/go.mod h1:jPW/WVKK9YHAvNhRxK0md/EJ228hCsBRufyofKtW8HA=
-k8s.io/utils v0.0.0-20210820185131-d34e5cb4466e h1:ldQh+neBabomh7+89dTpiFAB8tGdfVmuIzAHbvtl+9I=
 k8s.io/utils v0.0.0-20210820185131-d34e5cb4466e/go.mod h1:jPW/WVKK9YHAvNhRxK0md/EJ228hCsBRufyofKtW8HA=
+k8s.io/utils v0.0.0-20220728103510-ee6ede2d64ed h1:jAne/RjBTyawwAy0utX5eqigAwz/lQhTmy+Hr/Cpue4=
+k8s.io/utils v0.0.0-20220728103510-ee6ede2d64ed/go.mod h1:jPW/WVKK9YHAvNhRxK0md/EJ228hCsBRufyofKtW8HA=
 launchpad.net/gocheck v0.0.0-20140225173054-000000000087/go.mod h1:hj7XX3B/0A+80Vse0e+BUHsHMTEhd0O4cpUHr/e/BUM=
 mvdan.cc/xurls/v2 v2.1.0 h1:KaMb5GLhlcSX+e+qhbRJODnUUBvlw01jt4yrjFIHAuA=
 mvdan.cc/xurls/v2 v2.1.0/go.mod h1:5GrSd9rOnKOpZaji1OZLYL/yeAAtGDlo/cFe+8K5n8E=
@@ -2765,15 +2888,19 @@ sigs.k8s.io/controller-runtime v0.9.6/go.mod h1:q6PpkM5vqQubEKUKOM6qr06oXGzOBcCb
 sigs.k8s.io/controller-tools v0.6.2/go.mod h1:oaeGpjXn6+ZSEIQkUe/+3I40PNiDYp9aeawbt3xTgJ8=
 sigs.k8s.io/gateway-api v0.4.0 h1:07IJkTt21NetZTHtPKJk2I4XIgDN4BAlTIq1wK7V11o=
 sigs.k8s.io/gateway-api v0.4.0/go.mod h1:r3eiNP+0el+NTLwaTfOrCNXy8TukC+dIM3ggc+fbNWk=
+sigs.k8s.io/json v0.0.0-20220713155537-f223a00ba0e2 h1:iXTIw73aPyC+oRdyqqvVJuloN1p0AC/kzH07hu3NE+k=
+sigs.k8s.io/json v0.0.0-20220713155537-f223a00ba0e2/go.mod h1:B8JuhiUyNFVKdsE8h686QcCxMaH6HrOAZj4vswFpcB0=
 sigs.k8s.io/structured-merge-diff v0.0.0-20190525122527-15d366b2352e/go.mod h1:wWxsB5ozmmv/SG7nM11ayaAW51xMvak/t1r0CSlcokI=
 sigs.k8s.io/structured-merge-diff/v4 v4.0.2/go.mod h1:bJZC9H9iH24zzfZ/41RGcq60oK1F7G282QMXDPYydCw=
 sigs.k8s.io/structured-merge-diff/v4 v4.0.3/go.mod h1:bJZC9H9iH24zzfZ/41RGcq60oK1F7G282QMXDPYydCw=
 sigs.k8s.io/structured-merge-diff/v4 v4.1.0/go.mod h1:bJZC9H9iH24zzfZ/41RGcq60oK1F7G282QMXDPYydCw=
-sigs.k8s.io/structured-merge-diff/v4 v4.1.2 h1:Hr/htKFmJEbtMgS/UD0N+gtgctAqz81t3nu+sPzynno=
 sigs.k8s.io/structured-merge-diff/v4 v4.1.2/go.mod h1:j/nl6xW8vLS49O8YvXW1ocPhZawJtm+Yrr7PPRQ0Vg4=
+sigs.k8s.io/structured-merge-diff/v4 v4.2.3 h1:PRbqxJClWWYMNV1dhaG4NsibJbArud9kFxnAMREiWFE=
+sigs.k8s.io/structured-merge-diff/v4 v4.2.3/go.mod h1:qjx8mGObPmV2aSZepjQjbmb2ihdVs8cGKBraizNC69E=
 sigs.k8s.io/yaml v1.1.0/go.mod h1:UJmg0vDUVViEyp3mgSv9WPwZCDxu4rQW1olrI1uml+o=
-sigs.k8s.io/yaml v1.2.0 h1:kr/MCeFWJWTwyaHoR9c8EjH9OumOmoF9YGiZd7lFm/Q=
 sigs.k8s.io/yaml v1.2.0/go.mod h1:yfXDCHCao9+ENCvLSE62v9VSji2MKu5jeNfTrofGhJc=
+sigs.k8s.io/yaml v1.3.0 h1:a2VclLzOGrwOHDiV8EfBGhvjHvP46CtW5j6POvhYGGo=
+sigs.k8s.io/yaml v1.3.0/go.mod h1:GeOyir5tyXNByN85N/dRIT9es5UQNerPYEKK56eTBm8=
 sourcegraph.com/sourcegraph/appdash v0.0.0-20190731080439-ebfcffb1b5c0/go.mod h1:hI742Nqp5OhwiqlzhgfbWU4mW4yO10fP+LoT9WOswdU=
 sourcegraph.com/sourcegraph/go-diff v0.5.0/go.mod h1:kuch7UrkMzY0X+p9CRK03kfuPQ2zzQcaEFbx8wA8rck=
 sourcegraph.com/sqs/pbtypes v0.0.0-20180604144634-d3ebe8f20ae4/go.mod h1:ketZ/q3QxT9HOBeFhu6RdvsftgpsbFHBF5Cas6cDKZ0=

pkg/config/static/static_config.go

@@ -35,6 +35,7 @@ import (
 	"github.com/traefik/traefik/v2/pkg/tracing/haystack"
 	"github.com/traefik/traefik/v2/pkg/tracing/instana"
 	"github.com/traefik/traefik/v2/pkg/tracing/jaeger"
+	"github.com/traefik/traefik/v2/pkg/tracing/opentelemetry"
 	"github.com/traefik/traefik/v2/pkg/tracing/zipkin"
 	"github.com/traefik/traefik/v2/pkg/types"
 )
@@ -177,6 +178,7 @@ type Tracing struct {
 	Instana       *instana.Config       `description:"Settings for Instana." json:"instana,omitempty" toml:"instana,omitempty" yaml:"instana,omitempty" export:"true" label:"allowEmpty" file:"allowEmpty"`
 	Haystack      *haystack.Config      `description:"Settings for Haystack." json:"haystack,omitempty" toml:"haystack,omitempty" yaml:"haystack,omitempty" export:"true" label:"allowEmpty" file:"allowEmpty"`
 	Elastic       *elastic.Config       `description:"Settings for Elastic." json:"elastic,omitempty" toml:"elastic,omitempty" yaml:"elastic,omitempty" export:"true" label:"allowEmpty" file:"allowEmpty"`
+	OpenTelemetry *opentelemetry.Config `description:"Settings for OpenTelemetry." json:"openTelemetry,omitempty" toml:"openTelemetry,omitempty" yaml:"openTelemetry,omitempty" export:"true" label:"allowEmpty" file:"allowEmpty"`
 }
 
 // SetDefaults sets the default values.

pkg/metrics/opentelemetry.go

@@ -0,0 +1,422 @@
+package metrics
+
+import (
+	"context"
+	"fmt"
+	"net"
+	"strings"
+	"sync"
+	"time"
+
+	"github.com/go-kit/kit/metrics"
+	"github.com/rs/zerolog/log"
+	"github.com/traefik/traefik/v2/pkg/types"
+	"github.com/traefik/traefik/v2/pkg/version"
+	"go.opentelemetry.io/otel/attribute"
+	"go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc"
+	"go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetrichttp"
+	"go.opentelemetry.io/otel/metric"
+	"go.opentelemetry.io/otel/metric/global"
+	"go.opentelemetry.io/otel/metric/instrument"
+	"go.opentelemetry.io/otel/metric/instrument/asyncfloat64"
+	"go.opentelemetry.io/otel/metric/instrument/syncfloat64"
+	"go.opentelemetry.io/otel/metric/unit"
+	sdkmetric "go.opentelemetry.io/otel/sdk/metric"
+	"go.opentelemetry.io/otel/sdk/metric/aggregation"
+	"go.opentelemetry.io/otel/sdk/metric/view"
+	"google.golang.org/grpc/credentials"
+	"google.golang.org/grpc/encoding/gzip"
+)
+
+var (
+	openTelemetryMeterProvider  *sdkmetric.MeterProvider
+	openTelemetryGaugeCollector *gaugeCollector
+)
+
+// RegisterOpenTelemetry registers all OpenTelemetry metrics.
+func RegisterOpenTelemetry(ctx context.Context, config *types.OpenTelemetry) Registry {
+	if openTelemetryMeterProvider == nil {
+		var err error
+		if openTelemetryMeterProvider, err = newOpenTelemetryMeterProvider(ctx, config); err != nil {
+			log.Ctx(ctx).Err(err).Msg("Unable to create OpenTelemetry meter provider")
+
+			return nil
+		}
+	}
+
+	if openTelemetryGaugeCollector == nil {
+		openTelemetryGaugeCollector = newOpenTelemetryGaugeCollector()
+	}
+
+	meter := global.Meter("github.com/traefik/traefik",
+		metric.WithInstrumentationVersion(version.Version))
+
+	reg := &standardRegistry{
+		epEnabled:                      config.AddEntryPointsLabels,
+		routerEnabled:                  config.AddRoutersLabels,
+		svcEnabled:                     config.AddServicesLabels,
+		configReloadsCounter:           newOTLPCounterFrom(meter, configReloadsTotalName, "Config reloads"),
+		configReloadsFailureCounter:    newOTLPCounterFrom(meter, configReloadsFailuresTotalName, "Config reload failures"),
+		lastConfigReloadSuccessGauge:   newOTLPGaugeFrom(meter, configLastReloadSuccessName, "Last config reload success", unit.Milliseconds),
+		lastConfigReloadFailureGauge:   newOTLPGaugeFrom(meter, configLastReloadFailureName, "Last config reload failure", unit.Milliseconds),
+		tlsCertsNotAfterTimestampGauge: newOTLPGaugeFrom(meter, tlsCertsNotAfterTimestamp, "Certificate expiration timestamp", unit.Milliseconds),
+	}
+
+	if config.AddEntryPointsLabels {
+		reg.entryPointReqsCounter = newOTLPCounterFrom(meter, entryPointReqsTotalName,
+			"How many HTTP requests processed on an entrypoint, partitioned by status code, protocol, and method.")
+		reg.entryPointReqsTLSCounter = newOTLPCounterFrom(meter, entryPointReqsTLSTotalName,
+			"How many HTTP requests with TLS processed on an entrypoint, partitioned by TLS Version and TLS cipher Used.")
+		reg.entryPointReqDurationHistogram, _ = NewHistogramWithScale(newOTLPHistogramFrom(meter, entryPointReqDurationName,
+			"How long it took to process the request on an entrypoint, partitioned by status code, protocol, and method.",
+			unit.Milliseconds), time.Second)
+		reg.entryPointOpenConnsGauge = newOTLPGaugeFrom(meter, entryPointOpenConnsName,
+			"How many open connections exist on an entrypoint, partitioned by method and protocol.",
+			unit.Dimensionless)
+	}
+
+	if config.AddRoutersLabels {
+		reg.routerReqsCounter = newOTLPCounterFrom(meter, routerReqsTotalName,
+			"How many HTTP requests are processed on a router, partitioned by service, status code, protocol, and method.")
+		reg.routerReqsTLSCounter = newOTLPCounterFrom(meter, routerReqsTLSTotalName,
+			"How many HTTP requests with TLS are processed on a router, partitioned by service, TLS Version, and TLS cipher Used.")
+		reg.routerReqDurationHistogram, _ = NewHistogramWithScale(newOTLPHistogramFrom(meter, routerReqDurationName,
+			"How long it took to process the request on a router, partitioned by service, status code, protocol, and method.",
+			unit.Milliseconds), time.Second)
+		reg.routerOpenConnsGauge = newOTLPGaugeFrom(meter, routerOpenConnsName,
+			"How many open connections exist on a router, partitioned by service, method, and protocol.",
+			unit.Dimensionless)
+	}
+
+	if config.AddServicesLabels {
+		reg.serviceReqsCounter = newOTLPCounterFrom(meter, serviceReqsTotalName,
+			"How many HTTP requests processed on a service, partitioned by status code, protocol, and method.")
+		reg.serviceReqsTLSCounter = newOTLPCounterFrom(meter, serviceReqsTLSTotalName,
+			"How many HTTP requests with TLS processed on a service, partitioned by TLS version and TLS cipher.")
+		reg.serviceReqDurationHistogram, _ = NewHistogramWithScale(newOTLPHistogramFrom(meter, serviceReqDurationName,
+			"How long it took to process the request on a service, partitioned by status code, protocol, and method.",
+			unit.Milliseconds), time.Second)
+		reg.serviceOpenConnsGauge = newOTLPGaugeFrom(meter, serviceOpenConnsName,
+			"How many open connections exist on a service, partitioned by method and protocol.",
+			unit.Dimensionless)
+		reg.serviceRetriesCounter = newOTLPCounterFrom(meter, serviceRetriesTotalName,
+			"How many request retries happened on a service.")
+		reg.serviceServerUpGauge = newOTLPGaugeFrom(meter, serviceServerUpName,
+			"service server is up, described by gauge value of 0 or 1.",
+			unit.Dimensionless)
+	}
+
+	return reg
+}
+
+// StopOpenTelemetry stops and resets Open-Telemetry client.
+func StopOpenTelemetry() {
+	if openTelemetryMeterProvider == nil {
+		return
+	}
+
+	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+	defer cancel()
+
+	if err := openTelemetryMeterProvider.Shutdown(ctx); err != nil {
+		log.Err(err).Msg("Unable to shutdown OpenTelemetry meter provider")
+	}
+
+	openTelemetryMeterProvider = nil
+}
+
+// newOpenTelemetryMeterProvider creates a new controller.Controller.
+func newOpenTelemetryMeterProvider(ctx context.Context, config *types.OpenTelemetry) (*sdkmetric.MeterProvider, error) {
+	var (
+		exporter sdkmetric.Exporter
+		err      error
+	)
+	if config.GRPC != nil {
+		exporter, err = newGRPCExporter(ctx, config)
+	} else {
+		exporter, err = newHTTPExporter(ctx, config)
+	}
+	if err != nil {
+		return nil, fmt.Errorf("creating exporter: %w", err)
+	}
+
+	opts := []sdkmetric.PeriodicReaderOption{
+		sdkmetric.WithInterval(time.Duration(config.PushInterval)),
+	}
+
+	// View to customize histogram buckets and rename a single histogram instrument.
+	customBucketsView, err := view.New(
+		// Match* to match instruments
+		view.MatchInstrumentName("traefik_*_request_duration_seconds"),
+
+		view.WithSetAggregation(aggregation.ExplicitBucketHistogram{
+			Boundaries: config.ExplicitBoundaries,
+		}),
+	)
+	if err != nil {
+		return nil, fmt.Errorf("creating histogram view: %w", err)
+	}
+
+	meterProvider := sdkmetric.NewMeterProvider(sdkmetric.WithReader(
+		sdkmetric.NewPeriodicReader(exporter, opts...),
+		customBucketsView,
+	))
+
+	global.SetMeterProvider(meterProvider)
+
+	return meterProvider, nil
+}
+
+func newHTTPExporter(ctx context.Context, config *types.OpenTelemetry) (sdkmetric.Exporter, error) {
+	host, port, err := net.SplitHostPort(config.Address)
+	if err != nil {
+		return nil, fmt.Errorf("invalid collector address %q: %w", config.Address, err)
+	}
+
+	opts := []otlpmetrichttp.Option{
+		otlpmetrichttp.WithEndpoint(fmt.Sprintf("%s:%s", host, port)),
+		otlpmetrichttp.WithHeaders(config.Headers),
+		otlpmetrichttp.WithCompression(otlpmetrichttp.GzipCompression),
+	}
+
+	if config.Insecure {
+		opts = append(opts, otlpmetrichttp.WithInsecure())
+	}
+
+	if config.Path != "" {
+		opts = append(opts, otlpmetrichttp.WithURLPath(config.Path))
+	}
+
+	if config.TLS != nil {
+		tlsConfig, err := config.TLS.CreateTLSConfig(ctx)
+		if err != nil {
+			return nil, fmt.Errorf("creating TLS client config: %w", err)
+		}
+
+		opts = append(opts, otlpmetrichttp.WithTLSClientConfig(tlsConfig))
+	}
+
+	return otlpmetrichttp.New(ctx, opts...)
+}
+
+func newGRPCExporter(ctx context.Context, config *types.OpenTelemetry) (sdkmetric.Exporter, error) {
+	host, port, err := net.SplitHostPort(config.Address)
+	if err != nil {
+		return nil, fmt.Errorf("invalid collector address %q: %w", config.Address, err)
+	}
+
+	opts := []otlpmetricgrpc.Option{
+		otlpmetricgrpc.WithEndpoint(fmt.Sprintf("%s:%s", host, port)),
+		otlpmetricgrpc.WithHeaders(config.Headers),
+		otlpmetricgrpc.WithCompressor(gzip.Name),
+	}
+
+	if config.Insecure {
+		opts = append(opts, otlpmetricgrpc.WithInsecure())
+	}
+
+	if config.TLS != nil {
+		tlsConfig, err := config.TLS.CreateTLSConfig(ctx)
+		if err != nil {
+			return nil, fmt.Errorf("creating TLS client config: %w", err)
+		}
+
+		opts = append(opts, otlpmetricgrpc.WithTLSCredentials(credentials.NewTLS(tlsConfig)))
+	}
+
+	return otlpmetricgrpc.New(ctx, opts...)
+}
+
+func newOTLPCounterFrom(meter metric.Meter, name, desc string) *otelCounter {
+	c, _ := meter.SyncFloat64().Counter(name,
+		instrument.WithDescription(desc),
+		instrument.WithUnit(unit.Dimensionless),
+	)
+
+	return &otelCounter{
+		ip: c,
+	}
+}
+
+type otelCounter struct {
+	labelNamesValues otelLabelNamesValues
+	ip               syncfloat64.Counter
+}
+
+func (c *otelCounter) With(labelValues ...string) metrics.Counter {
+	return &otelCounter{
+		labelNamesValues: c.labelNamesValues.With(labelValues...),
+		ip:               c.ip,
+	}
+}
+
+func (c *otelCounter) Add(delta float64) {
+	c.ip.Add(context.Background(), delta, c.labelNamesValues.ToLabels()...)
+}
+
+type gaugeValue struct {
+	attributes otelLabelNamesValues
+	value      float64
+}
+
+type gaugeCollector struct {
+	mu     sync.Mutex
+	values map[string]map[string]gaugeValue
+}
+
+func newOpenTelemetryGaugeCollector() *gaugeCollector {
+	return &gaugeCollector{
+		values: make(map[string]map[string]gaugeValue),
+	}
+}
+
+func (c *gaugeCollector) add(name string, delta float64, attributes otelLabelNamesValues) {
+	c.mu.Lock()
+	defer c.mu.Unlock()
+
+	str := strings.Join(attributes, "")
+
+	if _, exists := c.values[name]; !exists {
+		c.values[name] = map[string]gaugeValue{
+			str: {
+				attributes: attributes,
+				value:      delta,
+			},
+		}
+		return
+	}
+
+	v, exists := c.values[name][str]
+	if !exists {
+		c.values[name][str] = gaugeValue{
+			attributes: attributes,
+			value:      delta,
+		}
+		return
+	}
+
+	c.values[name][str] = gaugeValue{
+		attributes: attributes,
+		value:      v.value + delta,
+	}
+}
+
+func (c *gaugeCollector) set(name string, value float64, attributes otelLabelNamesValues) {
+	c.mu.Lock()
+	defer c.mu.Unlock()
+
+	if _, exists := c.values[name]; !exists {
+		c.values[name] = make(map[string]gaugeValue)
+	}
+
+	c.values[name][strings.Join(attributes, "")] = gaugeValue{
+		attributes: attributes,
+		value:      value,
+	}
+}
+
+func newOTLPGaugeFrom(meter metric.Meter, name, desc string, u unit.Unit) *otelGauge {
+	openTelemetryGaugeCollector.values[name] = make(map[string]gaugeValue)
+
+	c, _ := meter.AsyncFloat64().Gauge(name,
+		instrument.WithDescription(desc),
+		instrument.WithUnit(u),
+	)
+
+	err := meter.RegisterCallback([]instrument.Asynchronous{c}, func(ctx context.Context) {
+		openTelemetryGaugeCollector.mu.Lock()
+		defer openTelemetryGaugeCollector.mu.Unlock()
+
+		values, exists := openTelemetryGaugeCollector.values[name]
+		if !exists {
+			return
+		}
+
+		for _, value := range values {
+			c.Observe(ctx, value.value, value.attributes.ToLabels()...)
+		}
+	})
+	if err != nil {
+		log.Err(err).Msg("Unable to register OpenTelemetry meter callback")
+	}
+
+	return &otelGauge{
+		ip:   c,
+		name: name,
+	}
+}
+
+type otelGauge struct {
+	labelNamesValues otelLabelNamesValues
+	ip               asyncfloat64.Gauge
+	name             string
+}
+
+func (g *otelGauge) With(labelValues ...string) metrics.Gauge {
+	return &otelGauge{
+		labelNamesValues: g.labelNamesValues.With(labelValues...),
+		ip:               g.ip,
+		name:             g.name,
+	}
+}
+
+func (g *otelGauge) Add(delta float64) {
+	openTelemetryGaugeCollector.add(g.name, delta, g.labelNamesValues)
+}
+
+func (g *otelGauge) Set(value float64) {
+	openTelemetryGaugeCollector.set(g.name, value, g.labelNamesValues)
+}
+
+func newOTLPHistogramFrom(meter metric.Meter, name, desc string, u unit.Unit) *otelHistogram {
+	c, _ := meter.SyncFloat64().Histogram(name,
+		instrument.WithDescription(desc),
+		instrument.WithUnit(u),
+	)
+
+	return &otelHistogram{
+		ip: c,
+	}
+}
+
+type otelHistogram struct {
+	labelNamesValues otelLabelNamesValues
+	ip               syncfloat64.Histogram
+}
+
+func (h *otelHistogram) With(labelValues ...string) metrics.Histogram {
+	return &otelHistogram{
+		labelNamesValues: h.labelNamesValues.With(labelValues...),
+		ip:               h.ip,
+	}
+}
+
+func (h *otelHistogram) Observe(incr float64) {
+	h.ip.Record(context.Background(), incr, h.labelNamesValues.ToLabels()...)
+}
+
+// otelLabelNamesValues is the equivalent of prometheus' labelNamesValues
+// but adapted to OpenTelemetry.
+// otelLabelNamesValues is a type alias that provides validation on its With
+// method.
+// Metrics may include it as a member to help them satisfy With semantics and
+// save some code duplication.
+type otelLabelNamesValues []string
+
+// With validates the input, and returns a new aggregate otelLabelNamesValues.
+func (lvs otelLabelNamesValues) With(labelValues ...string) otelLabelNamesValues {
+	if len(labelValues)%2 != 0 {
+		labelValues = append(labelValues, "unknown")
+	}
+	return append(lvs, labelValues...)
+}
+
+// ToLabels is a convenience method to convert a otelLabelNamesValues
+// to the native attribute.KeyValue.
+func (lvs otelLabelNamesValues) ToLabels() []attribute.KeyValue {
+	labels := make([]attribute.KeyValue, len(lvs)/2)
+	for i := 0; i < len(labels); i++ {
+		labels[i] = attribute.String(lvs[2*i], lvs[2*i+1])
+	}
+	return labels
+}

pkg/metrics/opentelemetry_test.go

@@ -0,0 +1,446 @@
+package metrics
+
+import (
+	"compress/gzip"
+	"context"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"net/http/httptest"
+	"net/url"
+	"strconv"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+	ptypes "github.com/traefik/paerser/types"
+	"github.com/traefik/traefik/v2/pkg/types"
+	"go.opentelemetry.io/collector/pdata/pmetric/pmetricotlp"
+	"go.opentelemetry.io/otel/attribute"
+)
+
+func TestOpenTelemetry_labels(t *testing.T) {
+	tests := []struct {
+		desc   string
+		values otelLabelNamesValues
+		with   []string
+		expect []attribute.KeyValue
+	}{
+		{
+			desc:   "with no starting value",
+			values: otelLabelNamesValues{},
+			expect: []attribute.KeyValue{},
+		},
+		{
+			desc:   "with one starting value",
+			values: otelLabelNamesValues{"foo"},
+			expect: []attribute.KeyValue{},
+		},
+		{
+			desc:   "with two starting value",
+			values: otelLabelNamesValues{"foo", "bar"},
+			expect: []attribute.KeyValue{attribute.String("foo", "bar")},
+		},
+		{
+			desc:   "with no starting value, and with one other value",
+			values: otelLabelNamesValues{},
+			with:   []string{"baz"},
+			expect: []attribute.KeyValue{attribute.String("baz", "unknown")},
+		},
+		{
+			desc:   "with no starting value, and with two other value",
+			values: otelLabelNamesValues{},
+			with:   []string{"baz", "buz"},
+			expect: []attribute.KeyValue{attribute.String("baz", "buz")},
+		},
+		{
+			desc:   "with one starting value, and with one other value",
+			values: otelLabelNamesValues{"foo"},
+			with:   []string{"baz"},
+			expect: []attribute.KeyValue{attribute.String("foo", "baz")},
+		},
+		{
+			desc:   "with one starting value, and with two other value",
+			values: otelLabelNamesValues{"foo"},
+			with:   []string{"baz", "buz"},
+			expect: []attribute.KeyValue{attribute.String("foo", "baz")},
+		},
+		{
+			desc:   "with two starting value, and with one other value",
+			values: otelLabelNamesValues{"foo", "bar"},
+			with:   []string{"baz"},
+			expect: []attribute.KeyValue{
+				attribute.String("foo", "bar"),
+				attribute.String("baz", "unknown"),
+			},
+		},
+		{
+			desc:   "with two starting value, and with two other value",
+			values: otelLabelNamesValues{"foo", "bar"},
+			with:   []string{"baz", "buz"},
+			expect: []attribute.KeyValue{
+				attribute.String("foo", "bar"),
+				attribute.String("baz", "buz"),
+			},
+		},
+	}
+
+	for _, test := range tests {
+		test := test
+
+		t.Run(test.desc, func(t *testing.T) {
+			t.Parallel()
+
+			assert.Equal(t, test.expect, test.values.With(test.with...).ToLabels())
+		})
+	}
+}
+
+func TestOpenTelemetry_GaugeCollectorAdd(t *testing.T) {
+	tests := []struct {
+		desc       string
+		gc         *gaugeCollector
+		delta      float64
+		name       string
+		attributes otelLabelNamesValues
+		expect     map[string]map[string]gaugeValue
+	}{
+		{
+			desc:  "empty collector",
+			gc:    newOpenTelemetryGaugeCollector(),
+			delta: 1,
+			name:  "foo",
+			expect: map[string]map[string]gaugeValue{
+				"foo": {"": {value: 1}},
+			},
+		},
+		{
+			desc: "initialized collector",
+			gc: &gaugeCollector{
+				values: map[string]map[string]gaugeValue{
+					"foo": {"": {value: 1}},
+				},
+			},
+			delta: 1,
+			name:  "foo",
+			expect: map[string]map[string]gaugeValue{
+				"foo": {"": {value: 2}},
+			},
+		},
+		{
+			desc: "initialized collector, values with label (only the last one counts)",
+			gc: &gaugeCollector{
+				values: map[string]map[string]gaugeValue{
+					"foo": {
+						"bar": {
+							attributes: otelLabelNamesValues{"bar"},
+							value:      1,
+						},
+					},
+				},
+			},
+			delta: 1,
+			name:  "foo",
+			expect: map[string]map[string]gaugeValue{
+				"foo": {
+					"": {
+						value: 1,
+					},
+					"bar": {
+						attributes: otelLabelNamesValues{"bar"},
+						value:      1,
+					},
+				},
+			},
+		},
+		{
+			desc: "initialized collector, values with label on set",
+			gc: &gaugeCollector{
+				values: map[string]map[string]gaugeValue{
+					"foo": {"bar": {value: 1}},
+				},
+			},
+			delta:      1,
+			name:       "foo",
+			attributes: otelLabelNamesValues{"baz"},
+			expect: map[string]map[string]gaugeValue{
+				"foo": {
+					"bar": {
+						value: 1,
+					},
+					"baz": {
+						value:      1,
+						attributes: otelLabelNamesValues{"baz"},
+					},
+				},
+			},
+		},
+	}
+
+	for _, test := range tests {
+		test := test
+
+		t.Run(test.desc, func(t *testing.T) {
+			t.Parallel()
+
+			test.gc.add(test.name, test.delta, test.attributes)
+
+			assert.Equal(t, test.expect, test.gc.values)
+		})
+	}
+}
+
+func TestOpenTelemetry_GaugeCollectorSet(t *testing.T) {
+	tests := []struct {
+		desc       string
+		gc         *gaugeCollector
+		value      float64
+		name       string
+		attributes otelLabelNamesValues
+		expect     map[string]map[string]gaugeValue
+	}{
+		{
+			desc:  "empty collector",
+			gc:    newOpenTelemetryGaugeCollector(),
+			value: 1,
+			name:  "foo",
+			expect: map[string]map[string]gaugeValue{
+				"foo": {"": {value: 1}},
+			},
+		},
+		{
+			desc: "initialized collector",
+			gc: &gaugeCollector{
+				values: map[string]map[string]gaugeValue{
+					"foo": {"": {value: 1}},
+				},
+			},
+			value: 1,
+			name:  "foo",
+			expect: map[string]map[string]gaugeValue{
+				"foo": {"": {value: 1}},
+			},
+		},
+		{
+			desc: "initialized collector, values with label",
+			gc: &gaugeCollector{
+				values: map[string]map[string]gaugeValue{
+					"foo": {
+						"bar": {
+							attributes: otelLabelNamesValues{"bar"},
+							value:      1,
+						},
+					},
+				},
+			},
+			value: 1,
+			name:  "foo",
+			expect: map[string]map[string]gaugeValue{
+				"foo": {
+					"": {
+						value: 1,
+					},
+					"bar": {
+						attributes: otelLabelNamesValues{"bar"},
+						value:      1,
+					},
+				},
+			},
+		},
+		{
+			desc: "initialized collector, values with label on set",
+			gc: &gaugeCollector{
+				values: map[string]map[string]gaugeValue{
+					"foo": {"": {value: 1}},
+				},
+			},
+			value:      1,
+			name:       "foo",
+			attributes: otelLabelNamesValues{"bar"},
+			expect: map[string]map[string]gaugeValue{
+				"foo": {
+					"": {
+						value: 1,
+					},
+					"bar": {
+						value:      1,
+						attributes: otelLabelNamesValues{"bar"},
+					},
+				},
+			},
+		},
+	}
+
+	for _, test := range tests {
+		test := test
+
+		t.Run(test.desc, func(t *testing.T) {
+			t.Parallel()
+
+			test.gc.set(test.name, test.value, test.attributes)
+
+			assert.Equal(t, test.expect, test.gc.values)
+		})
+	}
+}
+
+func TestOpenTelemetry(t *testing.T) {
+	t.Parallel()
+
+	c := make(chan *string)
+	defer close(c)
+	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		gzr, err := gzip.NewReader(r.Body)
+		require.NoError(t, err)
+
+		body, err := io.ReadAll(gzr)
+		require.NoError(t, err)
+
+		req := pmetricotlp.NewExportRequest()
+		err = req.UnmarshalProto(body)
+		require.NoError(t, err)
+
+		marshalledReq, err := json.Marshal(req)
+		require.NoError(t, err)
+
+		bodyStr := string(marshalledReq)
+		c <- &bodyStr
+
+		_, err = fmt.Fprintln(w, "ok")
+		require.NoError(t, err)
+	}))
+	defer ts.Close()
+
+	sURL, err := url.Parse(ts.URL)
+	require.NoError(t, err)
+
+	var cfg types.OpenTelemetry
+	(&cfg).SetDefaults()
+	cfg.AddRoutersLabels = true
+	cfg.Address = sURL.Host
+	cfg.Insecure = true
+	cfg.PushInterval = ptypes.Duration(10 * time.Millisecond)
+
+	registry := RegisterOpenTelemetry(context.Background(), &cfg)
+	require.NotNil(t, registry)
+
+	if !registry.IsEpEnabled() || !registry.IsRouterEnabled() || !registry.IsSvcEnabled() {
+		t.Fatalf("registry should return true for IsEnabled(), IsRouterEnabled() and IsSvcEnabled()")
+	}
+
+	// TODO: the len of startUnixNano is no supposed to be 20, it should be 19
+	expectedServer := []string{
+		`({"name":"traefik_config_reloads_total","description":"Config reloads","unit":"1","sum":{"dataPoints":\[{"startTimeUnixNano":"[\d]{19}","timeUnixNano":"[\d]{19}","asDouble":1}\],"aggregationTemporality":2,"isMonotonic":true}})`,
+		`({"name":"traefik_config_reloads_failure_total","description":"Config reload failures","unit":"1","sum":{"dataPoints":\[{"startTimeUnixNano":"[\d]{19}","timeUnixNano":"[\d]{19}","asDouble":1}\],"aggregationTemporality":2,"isMonotonic":true}})`,
+		`({"name":"traefik_config_last_reload_success","description":"Last config reload success","unit":"ms","gauge":{"dataPoints":\[{"startTimeUnixNano":"[\d]{20}","timeUnixNano":"[\d]{19}","asDouble":1}\]}})`,
+		`({"name":"traefik_config_last_reload_failure","description":"Last config reload failure","unit":"ms","gauge":{"dataPoints":\[{"startTimeUnixNano":"[\d]{20}","timeUnixNano":"[\d]{19}","asDouble":1}\]}})`,
+	}
+
+	registry.ConfigReloadsCounter().Add(1)
+	registry.ConfigReloadsFailureCounter().Add(1)
+	registry.LastConfigReloadSuccessGauge().Set(1)
+	registry.LastConfigReloadFailureGauge().Set(1)
+	msgServer := <-c
+
+	assertMessage(t, *msgServer, expectedServer)
+
+	expectedTLS := []string{
+		`({"name":"traefik_tls_certs_not_after","description":"Certificate expiration timestamp","unit":"ms","gauge":{"dataPoints":\[{"attributes":\[{"key":"key","value":{"stringValue":"value"}}\],"startTimeUnixNano":"[\d]{20}","timeUnixNano":"[\d]{19}","asDouble":1}\]}})`,
+	}
+
+	registry.TLSCertsNotAfterTimestampGauge().With("key", "value").Set(1)
+	msgTLS := <-c
+
+	assertMessage(t, *msgTLS, expectedTLS)
+
+	expectedEntrypoint := []string{
+		`({"name":"traefik_entrypoint_requests_total","description":"How many HTTP requests processed on an entrypoint, partitioned by status code, protocol, and method.","unit":"1","sum":{"dataPoints":\[{"attributes":\[{"key":"code","value":{"stringValue":"200"}},{"key":"entrypoint","value":{"stringValue":"test1"}},{"key":"method","value":{"stringValue":"GET"}}\],"startTimeUnixNano":"[\d]{19}","timeUnixNano":"[\d]{19}","asDouble":1}\],"aggregationTemporality":2,"isMonotonic":true}})`,
+		`({"name":"traefik_entrypoint_requests_tls_total","description":"How many HTTP requests with TLS processed on an entrypoint, partitioned by TLS Version and TLS cipher Used.","unit":"1","sum":{"dataPoints":\[{"attributes":\[{"key":"entrypoint","value":{"stringValue":"test2"}},{"key":"tls_cipher","value":{"stringValue":"bar"}},{"key":"tls_version","value":{"stringValue":"foo"}}\],"startTimeUnixNano":"[\d]{19}","timeUnixNano":"[\d]{19}","asDouble":1}\],"aggregationTemporality":2,"isMonotonic":true}})`,
+		`({"name":"traefik_entrypoint_request_duration_seconds","description":"How long it took to process the request on an entrypoint, partitioned by status code, protocol, and method.","unit":"ms","histogram":{"dataPoints":\[{"attributes":\[{"key":"entrypoint","value":{"stringValue":"test3"}}\],"startTimeUnixNano":"[\d]{19}","timeUnixNano":"[\d]{19}","count":"1","sum":10000,"bucketCounts":\["0","0","0","0","0","0","0","0","0","0","0","1"\],"explicitBounds":\[0.005,0.01,0.025,0.05,0.1,0.25,0.5,1,2.5,5,10\],"min":10000,"max":10000}\],"aggregationTemporality":2}})`,
+		`({"name":"traefik_entrypoint_open_connections","description":"How many open connections exist on an entrypoint, partitioned by method and protocol.","unit":"1","gauge":{"dataPoints":\[{"attributes":\[{"key":"entrypoint","value":{"stringValue":"test4"}}\],"startTimeUnixNano":"[\d]{20}","timeUnixNano":"[\d]{19}","asDouble":1}\]}})`,
+	}
+
+	registry.EntryPointReqsCounter().With("entrypoint", "test1", "code", strconv.Itoa(http.StatusOK), "method", http.MethodGet).Add(1)
+	registry.EntryPointReqsTLSCounter().With("entrypoint", "test2", "tls_version", "foo", "tls_cipher", "bar").Add(1)
+	registry.EntryPointReqDurationHistogram().With("entrypoint", "test3").Observe(10000)
+	registry.EntryPointOpenConnsGauge().With("entrypoint", "test4").Set(1)
+	msgEntrypoint := <-c
+
+	assertMessage(t, *msgEntrypoint, expectedEntrypoint)
+
+	expectedRouter := []string{
+		`({"name":"traefik_router_requests_total","description":"How many HTTP requests are processed on a router, partitioned by service, status code, protocol, and method.","unit":"1","sum":{"dataPoints":\[{"attributes":\[{"key":"code","value":{"stringValue":"(?:200|404)"}},{"key":"method","value":{"stringValue":"GET"}},{"key":"router","value":{"stringValue":"RouterReqsCounter"}},{"key":"service","value":{"stringValue":"test"}}\],"startTimeUnixNano":"[\d]{19}","timeUnixNano":"[\d]{19}","asDouble":1},{"attributes":\[{"key":"code","value":{"stringValue":"(?:200|404)"}},{"key":"method","value":{"stringValue":"GET"}},{"key":"router","value":{"stringValue":"RouterReqsCounter"}},{"key":"service","value":{"stringValue":"test"}}\],"startTimeUnixNano":"[\d]{19}","timeUnixNano":"[\d]{19}","asDouble":1}\],"aggregationTemporality":2,"isMonotonic":true}})`,
+		`({"name":"traefik_router_requests_tls_total","description":"How many HTTP requests with TLS are processed on a router, partitioned by service, TLS Version, and TLS cipher Used.","unit":"1","sum":{"dataPoints":\[{"attributes":\[{"key":"router","value":{"stringValue":"demo"}},{"key":"service","value":{"stringValue":"test"}},{"key":"tls_cipher","value":{"stringValue":"bar"}},{"key":"tls_version","value":{"stringValue":"foo"}}\],"startTimeUnixNano":"[\d]{19}","timeUnixNano":"[\d]{19}","asDouble":1}\],"aggregationTemporality":2,"isMonotonic":true}})`,
+		`({"name":"traefik_router_request_duration_seconds","description":"How long it took to process the request on a router, partitioned by service, status code, protocol, and method.","unit":"ms","histogram":{"dataPoints":\[{"attributes":\[{"key":"code","value":{"stringValue":"200"}},{"key":"router","value":{"stringValue":"demo"}},{"key":"service","value":{"stringValue":"test"}}\],"startTimeUnixNano":"[\d]{19}","timeUnixNano":"[\d]{19}","count":"1","sum":10000,"bucketCounts":\["0","0","0","0","0","0","0","0","0","0","0","1"\],"explicitBounds":\[0.005,0.01,0.025,0.05,0.1,0.25,0.5,1,2.5,5,10\],"min":10000,"max":10000}\],"aggregationTemporality":2}})`,
+		`({"name":"traefik_router_open_connections","description":"How many open connections exist on a router, partitioned by service, method, and protocol.","unit":"1","gauge":{"dataPoints":\[{"attributes":\[{"key":"router","value":{"stringValue":"demo"}},{"key":"service","value":{"stringValue":"test"}}\],"startTimeUnixNano":"[\d]{20}","timeUnixNano":"[\d]{19}","asDouble":1}\]}})`,
+	}
+
+	registry.RouterReqsCounter().With("router", "RouterReqsCounter", "service", "test", "code", strconv.Itoa(http.StatusNotFound), "method", http.MethodGet).Add(1)
+	registry.RouterReqsCounter().With("router", "RouterReqsCounter", "service", "test", "code", strconv.Itoa(http.StatusOK), "method", http.MethodGet).Add(1)
+	registry.RouterReqsTLSCounter().With("router", "demo", "service", "test", "tls_version", "foo", "tls_cipher", "bar").Add(1)
+	registry.RouterReqDurationHistogram().With("router", "demo", "service", "test", "code", strconv.Itoa(http.StatusOK)).Observe(10000)
+	registry.RouterOpenConnsGauge().With("router", "demo", "service", "test").Set(1)
+	msgRouter := <-c
+
+	assertMessage(t, *msgRouter, expectedRouter)
+
+	expectedService := []string{
+		`({"name":"traefik_service_requests_total","description":"How many HTTP requests processed on a service, partitioned by status code, protocol, and method.","unit":"1","sum":{"dataPoints":\[{"attributes":\[{"key":"code","value":{"stringValue":"(?:200|404)"}},{"key":"method","value":{"stringValue":"GET"}},{"key":"service","value":{"stringValue":"ServiceReqsCounter"}}\],"startTimeUnixNano":"[\d]{19}","timeUnixNano":"[\d]{19}","asDouble":1},{"attributes":\[{"key":"code","value":{"stringValue":"(?:200|404)"}},{"key":"method","value":{"stringValue":"GET"}},{"key":"service","value":{"stringValue":"ServiceReqsCounter"}}\],"startTimeUnixNano":"[\d]{19}","timeUnixNano":"[\d]{19}","asDouble":1}\],"aggregationTemporality":2,"isMonotonic":true}})`,
+		`({"name":"traefik_service_requests_tls_total","description":"How many HTTP requests with TLS processed on a service, partitioned by TLS version and TLS cipher.","unit":"1","sum":{"dataPoints":\[{"attributes":\[{"key":"service","value":{"stringValue":"test"}},{"key":"tls_cipher","value":{"stringValue":"bar"}},{"key":"tls_version","value":{"stringValue":"foo"}}\],"startTimeUnixNano":"[\d]{19}","timeUnixNano":"[\d]{19}","asDouble":1}\],"aggregationTemporality":2,"isMonotonic":true}})`,
+		`({"name":"traefik_service_request_duration_seconds","description":"How long it took to process the request on a service, partitioned by status code, protocol, and method.","unit":"ms","histogram":{"dataPoints":\[{"attributes":\[{"key":"code","value":{"stringValue":"200"}},{"key":"service","value":{"stringValue":"test"}}\],"startTimeUnixNano":"[\d]{19}","timeUnixNano":"[\d]{19}","count":"1","sum":10000,"bucketCounts":\["0","0","0","0","0","0","0","0","0","0","0","1"\],"explicitBounds":\[0.005,0.01,0.025,0.05,0.1,0.25,0.5,1,2.5,5,10\],"min":10000,"max":10000}\],"aggregationTemporality":2}})`,
+		`({"name":"traefik_service_server_up","description":"service server is up, described by gauge value of 0 or 1.","unit":"1","gauge":{"dataPoints":\[{"attributes":\[{"key":"service","value":{"stringValue":"test"}},{"key":"url","value":{"stringValue":"http://127.0.0.1"}}\],"startTimeUnixNano":"[\d]{20}","timeUnixNano":"[\d]{19}","asDouble":1}\]}})`,
+	}
+
+	registry.ServiceReqsCounter().With("service", "ServiceReqsCounter", "code", strconv.Itoa(http.StatusOK), "method", http.MethodGet).Add(1)
+	registry.ServiceReqsCounter().With("service", "ServiceReqsCounter", "code", strconv.Itoa(http.StatusNotFound), "method", http.MethodGet).Add(1)
+	registry.ServiceReqsTLSCounter().With("service", "test", "tls_version", "foo", "tls_cipher", "bar").Add(1)
+	registry.ServiceReqDurationHistogram().With("service", "test", "code", strconv.Itoa(http.StatusOK)).Observe(10000)
+	registry.ServiceServerUpGauge().With("service", "test", "url", "http://127.0.0.1").Set(1)
+	msgService := <-c
+
+	assertMessage(t, *msgService, expectedService)
+
+	expectedServiceRetries := []string{
+		`({"attributes":\[{"key":"service","value":{"stringValue":"foobar"}}\],"startTimeUnixNano":"[\d]{19}","timeUnixNano":"[\d]{19}","asDouble":1})`,
+		`({"attributes":\[{"key":"service","value":{"stringValue":"test"}}\],"startTimeUnixNano":"[\d]{19}","timeUnixNano":"[\d]{19}","asDouble":2})`,
+	}
+
+	registry.ServiceRetriesCounter().With("service", "test").Add(1)
+	registry.ServiceRetriesCounter().With("service", "test").Add(1)
+	registry.ServiceRetriesCounter().With("service", "foobar").Add(1)
+	msgServiceRetries := <-c
+
+	assertMessage(t, *msgServiceRetries, expectedServiceRetries)
+
+	expectedServiceOpenConns := []string{
+		`({"attributes":\[{"key":"service","value":{"stringValue":"test"}}\],"startTimeUnixNano":"[\d]{20}","timeUnixNano":"[\d]{19}","asDouble":3})`,
+		`({"attributes":\[{"key":"service","value":{"stringValue":"foobar"}}\],"startTimeUnixNano":"[\d]{20}","timeUnixNano":"[\d]{19}","asDouble":1})`,
+	}
+
+	registry.ServiceOpenConnsGauge().With("service", "test").Set(1)
+	registry.ServiceOpenConnsGauge().With("service", "test").Add(1)
+	registry.ServiceOpenConnsGauge().With("service", "test").Add(1)
+	registry.ServiceOpenConnsGauge().With("service", "foobar").Add(1)
+	msgServiceOpenConns := <-c
+
+	assertMessage(t, *msgServiceOpenConns, expectedServiceOpenConns)
+
+	expectedEntryPointReqDuration := []string{
+		`({"attributes":\[{"key":"entrypoint","value":{"stringValue":"myEntrypoint"}}\],"startTimeUnixNano":"[\d]{19}","timeUnixNano":"[\d]{19}","count":"2","sum":30000,"bucketCounts":\["0","0","0","0","0","0","0","0","0","0","0","2"\],"explicitBounds":\[0.005,0.01,0.025,0.05,0.1,0.25,0.5,1,2.5,5,10\],"min":10000,"max":20000})`,
+	}
+
+	registry.EntryPointReqDurationHistogram().With("entrypoint", "myEntrypoint").Observe(10000)
+	registry.EntryPointReqDurationHistogram().With("entrypoint", "myEntrypoint").Observe(20000)
+	msgEntryPointReqDurationHistogram := <-c
+
+	assertMessage(t, *msgEntryPointReqDurationHistogram, expectedEntryPointReqDuration)
+
+	// We need to unlock the HTTP Server for the last export call when stopping
+	// OpenTelemetry.
+	go func() {
+		<-c
+	}()
+	StopOpenTelemetry()
+}

pkg/server/server.go

@@ -113,4 +113,5 @@ func stopMetricsClients() {
 	metrics.StopStatsd()
 	metrics.StopInfluxDB()
 	metrics.StopInfluxDB2()
+	metrics.StopOpenTelemetry()
 }

pkg/tracing/opentelemetry/opentelemetry.go

@@ -0,0 +1,138 @@
+package opentelemetry
+
+import (
+	"context"
+	"fmt"
+	"io"
+	"net"
+
+	"github.com/opentracing/opentracing-go"
+	"github.com/rs/zerolog/log"
+	"github.com/traefik/traefik/v2/pkg/types"
+	"github.com/traefik/traefik/v2/pkg/version"
+	"go.opentelemetry.io/otel"
+	oteltracer "go.opentelemetry.io/otel/bridge/opentracing"
+	"go.opentelemetry.io/otel/exporters/otlp/otlptrace"
+	"go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc"
+	"go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp"
+	"go.opentelemetry.io/otel/propagation"
+	sdktrace "go.opentelemetry.io/otel/sdk/trace"
+	"go.opentelemetry.io/otel/trace"
+	"google.golang.org/grpc/credentials"
+	"google.golang.org/grpc/encoding/gzip"
+)
+
+// Config provides configuration settings for the open-telemetry tracer.
+type Config struct {
+	// NOTE: as no gRPC option is implemented yet, the type is empty and is used as a boolean for upward compatibility purposes.
+	GRPC *struct{} `description:"gRPC specific configuration for the OpenTelemetry collector." json:"grpc,omitempty" toml:"grpc,omitempty" yaml:"grpc,omitempty" export:"true" label:"allowEmpty" file:"allowEmpty"`
+
+	Address  string            `description:"Sets the address (host:port) of the collector endpoint." json:"address,omitempty" toml:"address,omitempty" yaml:"address,omitempty"`
+	Path     string            `description:"Sets the URL path of the collector endpoint." json:"path,omitempty" toml:"path,omitempty" yaml:"path,omitempty" export:"true"`
+	Insecure bool              `description:"Disables client transport security for the exporter." json:"insecure,omitempty" toml:"insecure,omitempty" yaml:"insecure,omitempty" export:"true"`
+	Headers  map[string]string `description:"Defines additional headers to be sent with the payloads." json:"headers,omitempty" toml:"headers,omitempty" yaml:"headers,omitempty" export:"true"`
+	TLS      *types.ClientTLS  `description:"Defines client transport security parameters." json:"tls,omitempty" toml:"tls,omitempty" yaml:"tls,omitempty" export:"true"`
+}
+
+// SetDefaults sets the default values.
+func (c *Config) SetDefaults() {
+	c.Address = "localhost:4318"
+}
+
+// Setup sets up the tracer.
+func (c *Config) Setup(componentName string) (opentracing.Tracer, io.Closer, error) {
+	var (
+		err      error
+		exporter *otlptrace.Exporter
+	)
+	if c.GRPC != nil {
+		exporter, err = c.setupGRPCExporter()
+	} else {
+		exporter, err = c.setupHTTPExporter()
+	}
+	if err != nil {
+		return nil, nil, fmt.Errorf("setting up exporter: %w", err)
+	}
+
+	bt := oteltracer.NewBridgeTracer()
+	bt.SetTextMapPropagator(propagation.NewCompositeTextMapPropagator(propagation.TraceContext{}, propagation.Baggage{}))
+
+	bt.SetOpenTelemetryTracer(otel.Tracer(componentName, trace.WithInstrumentationVersion(version.Version)))
+	opentracing.SetGlobalTracer(bt)
+
+	tracerProvider := sdktrace.NewTracerProvider(sdktrace.WithBatcher(exporter))
+	otel.SetTracerProvider(tracerProvider)
+
+	log.Debug().Msg("OpenTelemetry tracer configured")
+
+	return bt, tpCloser{provider: tracerProvider}, err
+}
+
+func (c *Config) setupHTTPExporter() (*otlptrace.Exporter, error) {
+	host, port, err := net.SplitHostPort(c.Address)
+	if err != nil {
+		return nil, fmt.Errorf("invalid collector address %q: %w", c.Address, err)
+	}
+
+	opts := []otlptracehttp.Option{
+		otlptracehttp.WithEndpoint(fmt.Sprintf("%s:%s", host, port)),
+		otlptracehttp.WithHeaders(c.Headers),
+		otlptracehttp.WithCompression(otlptracehttp.GzipCompression),
+	}
+
+	if c.Insecure {
+		opts = append(opts, otlptracehttp.WithInsecure())
+	}
+
+	if c.Path != "" {
+		opts = append(opts, otlptracehttp.WithURLPath(c.Path))
+	}
+
+	if c.TLS != nil {
+		tlsConfig, err := c.TLS.CreateTLSConfig(context.Background())
+		if err != nil {
+			return nil, fmt.Errorf("creating TLS client config: %w", err)
+		}
+
+		opts = append(opts, otlptracehttp.WithTLSClientConfig(tlsConfig))
+	}
+
+	return otlptrace.New(context.Background(), otlptracehttp.NewClient(opts...))
+}
+
+func (c *Config) setupGRPCExporter() (*otlptrace.Exporter, error) {
+	host, port, err := net.SplitHostPort(c.Address)
+	if err != nil {
+		return nil, fmt.Errorf("invalid collector address %q: %w", c.Address, err)
+	}
+
+	opts := []otlptracegrpc.Option{
+		otlptracegrpc.WithEndpoint(fmt.Sprintf("%s:%s", host, port)),
+		otlptracegrpc.WithHeaders(c.Headers),
+		otlptracegrpc.WithCompressor(gzip.Name),
+	}
+
+	if c.Insecure {
+		opts = append(opts, otlptracegrpc.WithInsecure())
+	}
+
+	if c.TLS != nil {
+		tlsConfig, err := c.TLS.CreateTLSConfig(context.Background())
+		if err != nil {
+			return nil, fmt.Errorf("creating TLS client config: %w", err)
+		}
+
+		opts = append(opts, otlptracegrpc.WithTLSCredentials(credentials.NewTLS(tlsConfig)))
+	}
+
+	return otlptrace.New(context.Background(), otlptracegrpc.NewClient(opts...))
+}
+
+// tpCloser converts a TraceProvider into an io.Closer.
+type tpCloser struct {
+	provider *sdktrace.TracerProvider
+}
+
+func (t tpCloser) Close() error {
+	return t.provider.Shutdown(context.Background())
+}

pkg/tracing/opentelemetry/opentelemetry_test.go

@@ -0,0 +1,67 @@
+package opentelemetry
+
+import (
+	"compress/gzip"
+	"context"
+	"encoding/json"
+	"io"
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+	mtracing "github.com/traefik/traefik/v2/pkg/middlewares/tracing"
+	"github.com/traefik/traefik/v2/pkg/tracing"
+	"go.opentelemetry.io/collector/pdata/ptrace/ptraceotlp"
+)
+
+func TestTraceContextPropagation(t *testing.T) {
+	t.Parallel()
+
+	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		gzr, err := gzip.NewReader(r.Body)
+		require.NoError(t, err)
+
+		body, err := io.ReadAll(gzr)
+		require.NoError(t, err)
+
+		req := ptraceotlp.NewExportRequest()
+		err = req.UnmarshalProto(body)
+		require.NoError(t, err)
+
+		marshalledReq, err := json.Marshal(req)
+		require.NoError(t, err)
+
+		bodyStr := string(marshalledReq)
+		assert.Regexp(t, `("traceId":"00000000000000000000000000000001")`, bodyStr)
+		assert.Regexp(t, `("parentSpanId":"0000000000000001")`, bodyStr)
+		assert.Regexp(t, `("traceState":"foo=bar")`, bodyStr)
+	}))
+	defer ts.Close()
+
+	cfg := Config{
+		Address:  strings.TrimPrefix(ts.URL, "http://"),
+		Insecure: true,
+	}
+
+	newTracing, err := tracing.NewTracing("", 0, &cfg)
+	require.NoError(t, err)
+	defer newTracing.Close()
+
+	req := httptest.NewRequest(http.MethodGet, "http://www.test.com", nil)
+	req.Header.Set("traceparent", "00-00000000000000000000000000000001-0000000000000001-00")
+	req.Header.Set("tracestate", "foo=bar")
+	rw := httptest.NewRecorder()
+
+	var forwarded bool
+	next := http.HandlerFunc(func(http.ResponseWriter, *http.Request) {
+		forwarded = true
+	})
+
+	handler := mtracing.NewEntryPoint(context.Background(), newTracing, "test", next)
+	handler.ServeHTTP(rw, req)
+
+	require.True(t, forwarded)
+}

pkg/tracing/operation_name_test.go

@@ -72,8 +72,8 @@ func TestComputeHash(t *testing.T) {
 	}{
 		{
 			desc:     "hashing",
-			text:     "some very long pice of text",
+			text:     "some very long piece of text",
-			expected: "0258ea1c",
+			expected: "0c6e798b",
 		},
 		{
 			desc:     "short text less than limit 10",
@@ -109,7 +109,7 @@ func TestTruncateString(t *testing.T) {
 		},
 		{
 			desc:     "basic truncate with limit 10",
-			text:     "some very long pice of text",
+			text:     "some very long piece of text",
 			limit:    10,
 			expected: "some ve...",
 		},

pkg/types/metrics.go

@@ -15,6 +15,7 @@ type Metrics struct {
 	StatsD        *Statsd        `description:"StatsD metrics exporter type." json:"statsD,omitempty" toml:"statsD,omitempty" yaml:"statsD,omitempty" label:"allowEmpty" file:"allowEmpty" export:"true"`
 	InfluxDB      *InfluxDB      `description:"InfluxDB metrics exporter type." json:"influxDB,omitempty" toml:"influxDB,omitempty" yaml:"influxDB,omitempty" label:"allowEmpty" file:"allowEmpty" export:"true"`
 	InfluxDB2     *InfluxDB2     `description:"InfluxDB v2 metrics exporter type." json:"influxDB2,omitempty" toml:"influxDB2,omitempty" yaml:"influxDB2,omitempty" label:"allowEmpty" file:"allowEmpty" export:"true"`
+	OpenTelemetry *OpenTelemetry `description:"OpenTelemetry metrics exporter type." json:"openTelemetry,omitempty" toml:"openTelemetry,omitempty" yaml:"openTelemetry,omitempty" label:"allowEmpty" file:"allowEmpty" export:"true"`
 }
 
 // Prometheus can contain specific configuration used by the Prometheus Metrics exporter.
@@ -127,6 +128,32 @@ func (i *InfluxDB2) SetDefaults() {
 	i.AddServicesLabels = true
 }
 
+// OpenTelemetry contains specific configuration used by the OpenTelemetry Metrics exporter.
+type OpenTelemetry struct {
+	// NOTE: as no gRPC option is implemented yet, the type is empty and is used as a boolean for upward compatibility purposes.
+	GRPC *struct{} `description:"gRPC specific configuration for the OpenTelemetry collector." json:"grpc,omitempty" toml:"grpc,omitempty" yaml:"grpc,omitempty" export:"true" label:"allowEmpty" file:"allowEmpty"`
+
+	Address              string            `description:"Address (host:port) of the collector endpoint." json:"address,omitempty" toml:"address,omitempty" yaml:"address,omitempty"`
+	AddEntryPointsLabels bool              `description:"Enable metrics on entry points." json:"addEntryPointsLabels,omitempty" toml:"addEntryPointsLabels,omitempty" yaml:"addEntryPointsLabels,omitempty" export:"true"`
+	AddRoutersLabels     bool              `description:"Enable metrics on routers." json:"addRoutersLabels,omitempty" toml:"addRoutersLabels,omitempty" yaml:"addRoutersLabels,omitempty" export:"true"`
+	AddServicesLabels    bool              `description:"Enable metrics on services." json:"addServicesLabels,omitempty" toml:"addServicesLabels,omitempty" yaml:"addServicesLabels,omitempty" export:"true"`
+	ExplicitBoundaries   []float64         `description:"Boundaries for latency metrics." json:"explicitBoundaries,omitempty" toml:"explicitBoundaries,omitempty" yaml:"explicitBoundaries,omitempty" export:"true"`
+	Headers              map[string]string `description:"Headers sent with payload." json:"headers,omitempty" toml:"headers,omitempty" yaml:"headers,omitempty" export:"true"`
+	Insecure             bool              `description:"Disables client transport security for the exporter." json:"insecure,omitempty" toml:"insecure,omitempty" yaml:"insecure,omitempty" export:"true"`
+	Path                 string            `description:"Set the URL path of the collector endpoint." json:"path,omitempty" toml:"path,omitempty" yaml:"path,omitempty" export:"true"`
+	PushInterval         types.Duration    `description:"Period between calls to collect a checkpoint." json:"pushInterval,omitempty" toml:"pushInterval,omitempty" yaml:"pushInterval,omitempty" export:"true"`
+	TLS                  *ClientTLS        `description:"Enable TLS support." json:"tls,omitempty" toml:"tls,omitempty" yaml:"tls,omitempty" export:"true"`
+}
+
+// SetDefaults sets the default values.
+func (o *OpenTelemetry) SetDefaults() {
+	o.Address = "localhost:4318"
+	o.AddEntryPointsLabels = true
+	o.AddServicesLabels = true
+	o.ExplicitBoundaries = []float64{.005, .01, .025, .05, .1, .25, .5, 1, 2.5, 5, 10}
+	o.PushInterval = types.Duration(10 * time.Second)
+}
+
 // Statistics provides options for monitoring request and response stats.
 type Statistics struct {
 	RecentErrors int `description:"Number of recent errors logged." json:"recentErrors,omitempty" toml:"recentErrors,omitempty" yaml:"recentErrors,omitempty" export:"true"`