Allow empty configuration for OpenTelemetry metrics and tracing

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

@@ -339,6 +339,9 @@ Enable metrics on services. (Default: ```true```)
 `--metrics.otlp.explicitboundaries`:  
 Boundaries for latency metrics. (Default: ```0.005000, 0.010000, 0.025000, 0.050000, 0.075000, 0.100000, 0.250000, 0.500000, 0.750000, 1.000000, 2.500000, 5.000000, 7.500000, 10.000000```)
 
+`--metrics.otlp.grpc`:  
+gRPC configuration for the OpenTelemetry collector. (Default: ```false```)
+
 `--metrics.otlp.grpc.endpoint`:  
 Sets the gRPC endpoint (host:port) of the collector. (Default: ```localhost:4317```)
 
@@ -360,6 +363,9 @@ TLS insecure skip verify (Default: ```false```)
 `--metrics.otlp.grpc.tls.key`:  
 TLS key
 
+`--metrics.otlp.http`:  
+HTTP configuration for the OpenTelemetry collector. (Default: ```false```)
+
 `--metrics.otlp.http.endpoint`:  
 Sets the HTTP endpoint (scheme://host:port/path) of the collector. (Default: ```https://localhost:4318```)
 
@@ -1056,6 +1062,9 @@ Defines additional attributes (key:value) on all spans.
 `--tracing.otlp`:  
 Settings for OpenTelemetry. (Default: ```false```)
 
+`--tracing.otlp.grpc`:  
+gRPC configuration for the OpenTelemetry collector. (Default: ```false```)
+
 `--tracing.otlp.grpc.endpoint`:  
 Sets the gRPC endpoint (host:port) of the collector. (Default: ```localhost:4317```)
 
@@ -1077,6 +1086,9 @@ TLS insecure skip verify (Default: ```false```)
 `--tracing.otlp.grpc.tls.key`:  
 TLS key
 
+`--tracing.otlp.http`:  
+HTTP configuration for the OpenTelemetry collector. (Default: ```false```)
+
 `--tracing.otlp.http.endpoint`:  
 Sets the HTTP endpoint (scheme://host:port/path) of the collector. (Default: ```https://localhost:4318```)
 

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

@@ -339,6 +339,9 @@ Enable metrics on services. (Default: ```true```)
 `TRAEFIK_METRICS_OTLP_EXPLICITBOUNDARIES`:  
 Boundaries for latency metrics. (Default: ```0.005000, 0.010000, 0.025000, 0.050000, 0.075000, 0.100000, 0.250000, 0.500000, 0.750000, 1.000000, 2.500000, 5.000000, 7.500000, 10.000000```)
 
+`TRAEFIK_METRICS_OTLP_GRPC`:  
+gRPC configuration for the OpenTelemetry collector. (Default: ```false```)
+
 `TRAEFIK_METRICS_OTLP_GRPC_ENDPOINT`:  
 Sets the gRPC endpoint (host:port) of the collector. (Default: ```localhost:4317```)
 
@@ -360,6 +363,9 @@ TLS insecure skip verify (Default: ```false```)
 `TRAEFIK_METRICS_OTLP_GRPC_TLS_KEY`:  
 TLS key
 
+`TRAEFIK_METRICS_OTLP_HTTP`:  
+HTTP configuration for the OpenTelemetry collector. (Default: ```false```)
+
 `TRAEFIK_METRICS_OTLP_HTTP_ENDPOINT`:  
 Sets the HTTP endpoint (scheme://host:port/path) of the collector. (Default: ```https://localhost:4318```)
 
@@ -1056,6 +1062,9 @@ Defines additional attributes (key:value) on all spans.
 `TRAEFIK_TRACING_OTLP`:  
 Settings for OpenTelemetry. (Default: ```false```)
 
+`TRAEFIK_TRACING_OTLP_GRPC`:  
+gRPC configuration for the OpenTelemetry collector. (Default: ```false```)
+
 `TRAEFIK_TRACING_OTLP_GRPC_ENDPOINT`:  
 Sets the gRPC endpoint (host:port) of the collector. (Default: ```localhost:4317```)
 
@@ -1077,6 +1086,9 @@ TLS insecure skip verify (Default: ```false```)
 `TRAEFIK_TRACING_OTLP_GRPC_TLS_KEY`:  
 TLS key
 
+`TRAEFIK_TRACING_OTLP_HTTP`:  
+HTTP configuration for the OpenTelemetry collector. (Default: ```false```)
+
 `TRAEFIK_TRACING_OTLP_HTTP_ENDPOINT`:  
 Sets the HTTP endpoint (scheme://host:port/path) of the collector. (Default: ```https://localhost:4318```)
 

pkg/tracing/opentelemetry/opentelemetry.go

@@ -26,8 +26,8 @@ import (
 
 // Config provides configuration settings for the open-telemetry tracer.
 type Config struct {
-	GRPC *types.OtelGRPC `description:"gRPC configuration for the OpenTelemetry collector." json:"grpc,omitempty" toml:"grpc,omitempty" yaml:"grpc,omitempty" export:"true"`
+	GRPC *types.OtelGRPC `description:"gRPC configuration for the OpenTelemetry collector." json:"grpc,omitempty" toml:"grpc,omitempty" yaml:"grpc,omitempty" label:"allowEmpty" file:"allowEmpty" export:"true"`
-	HTTP *types.OtelHTTP `description:"HTTP configuration for the OpenTelemetry collector." json:"http,omitempty" toml:"http,omitempty" yaml:"http,omitempty" export:"true"`
+	HTTP *types.OtelHTTP `description:"HTTP configuration for the OpenTelemetry collector." json:"http,omitempty" toml:"http,omitempty" yaml:"http,omitempty" label:"allowEmpty" file:"allowEmpty" export:"true"`
 }
 
 // SetDefaults sets the default values.

pkg/types/metrics.go

@@ -108,8 +108,8 @@ func (i *InfluxDB2) SetDefaults() {
 
 // OTLP contains specific configuration used by the OpenTelemetry Metrics exporter.
 type OTLP struct {
-	GRPC *OtelGRPC `description:"gRPC configuration for the OpenTelemetry collector." json:"grpc,omitempty" toml:"grpc,omitempty" yaml:"grpc,omitempty" export:"true"`
+	GRPC *OtelGRPC `description:"gRPC configuration for the OpenTelemetry collector." json:"grpc,omitempty" toml:"grpc,omitempty" yaml:"grpc,omitempty" label:"allowEmpty" file:"allowEmpty" export:"true"`
-	HTTP *OtelHTTP `description:"HTTP configuration for the OpenTelemetry collector." json:"http,omitempty" toml:"http,omitempty" yaml:"http,omitempty" export:"true"`
+	HTTP *OtelHTTP `description:"HTTP configuration for the OpenTelemetry collector." json:"http,omitempty" toml:"http,omitempty" yaml:"http,omitempty" label:"allowEmpty" file:"allowEmpty" export:"true"`
 
 	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"`