traefik/pkg/metrics/opentelemetry.go

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package metrics
import (
"context"
"fmt"
"net"
"net/url"
"strings"
"sync"
"time"
"github.com/go-kit/kit/metrics"
"github.com/rs/zerolog/log"
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"github.com/traefik/traefik/v3/pkg/types"
"github.com/traefik/traefik/v3/pkg/version"
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"go.opentelemetry.io/otel"
"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"
sdkmetric "go.opentelemetry.io/otel/sdk/metric"
"go.opentelemetry.io/otel/sdk/resource"
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semconv "go.opentelemetry.io/otel/semconv/v1.21.0"
"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.OTLP) 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()
}
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meter := otel.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"),
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lastConfigReloadSuccessGauge: newOTLPGaugeFrom(meter, configLastReloadSuccessName, "Last config reload success", "ms"),
openConnectionsGauge: newOTLPGaugeFrom(meter, openConnectionsName, "How many open connections exist, by entryPoint and protocol", "1"),
tlsCertsNotAfterTimestampGauge: newOTLPGaugeFrom(meter, tlsCertsNotAfterTimestampName, "Certificate expiration timestamp", "ms"),
}
if config.AddEntryPointsLabels {
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reg.entryPointReqsCounter = NewCounterWithNoopHeaders(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.",
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"ms"), time.Second)
reg.entryPointReqsBytesCounter = newOTLPCounterFrom(meter, entryPointReqsBytesTotalName,
"The total size of requests in bytes handled by an entrypoint, partitioned by status code, protocol, and method.")
reg.entryPointRespsBytesCounter = newOTLPCounterFrom(meter, entryPointRespsBytesTotalName,
"The total size of responses in bytes handled by an entrypoint, partitioned by status code, protocol, and method.")
}
if config.AddRoutersLabels {
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reg.routerReqsCounter = NewCounterWithNoopHeaders(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.",
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"ms"), time.Second)
reg.routerReqsBytesCounter = newOTLPCounterFrom(meter, routerReqsBytesTotalName,
"The total size of requests in bytes handled by a router, partitioned by status code, protocol, and method.")
reg.routerRespsBytesCounter = newOTLPCounterFrom(meter, routerRespsBytesTotalName,
"The total size of responses in bytes handled by a router, partitioned by status code, protocol, and method.")
}
if config.AddServicesLabels {
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reg.serviceReqsCounter = NewCounterWithNoopHeaders(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.",
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"ms"), time.Second)
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.",
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"1")
reg.serviceReqsBytesCounter = newOTLPCounterFrom(meter, serviceReqsBytesTotalName,
"The total size of requests in bytes received by a service, partitioned by status code, protocol, and method.")
reg.serviceRespsBytesCounter = newOTLPCounterFrom(meter, serviceRespsBytesTotalName,
"The total size of responses in bytes returned by a service, partitioned by status code, protocol, and method.")
}
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.OTLP) (*sdkmetric.MeterProvider, error) {
var (
exporter sdkmetric.Exporter
err error
)
if config.GRPC != nil {
exporter, err = newGRPCExporter(ctx, config.GRPC)
} else {
exporter, err = newHTTPExporter(ctx, config.HTTP)
}
if err != nil {
return nil, fmt.Errorf("creating exporter: %w", err)
}
res, err := resource.New(ctx,
resource.WithAttributes(semconv.ServiceNameKey.String("traefik")),
resource.WithAttributes(semconv.ServiceVersionKey.String(version.Version)),
resource.WithFromEnv(),
resource.WithTelemetrySDK(),
)
if err != nil {
return nil, fmt.Errorf("building resource: %w", err)
}
opts := []sdkmetric.PeriodicReaderOption{
sdkmetric.WithInterval(time.Duration(config.PushInterval)),
}
meterProvider := sdkmetric.NewMeterProvider(
sdkmetric.WithResource(res),
sdkmetric.WithReader(sdkmetric.NewPeriodicReader(exporter, opts...)),
// View to customize histogram buckets and rename a single histogram instrument.
sdkmetric.WithView(sdkmetric.NewView(
sdkmetric.Instrument{Name: "traefik_*_request_duration_seconds"},
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sdkmetric.Stream{Aggregation: sdkmetric.AggregationExplicitBucketHistogram{
Boundaries: config.ExplicitBoundaries,
}},
)),
)
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otel.SetMeterProvider(meterProvider)
return meterProvider, nil
}
func newHTTPExporter(ctx context.Context, config *types.OtelHTTP) (sdkmetric.Exporter, error) {
endpoint, err := url.Parse(config.Endpoint)
if err != nil {
return nil, fmt.Errorf("invalid collector endpoint %q: %w", config.Endpoint, err)
}
opts := []otlpmetrichttp.Option{
otlpmetrichttp.WithEndpoint(endpoint.Host),
otlpmetrichttp.WithHeaders(config.Headers),
otlpmetrichttp.WithCompression(otlpmetrichttp.GzipCompression),
}
if endpoint.Scheme == "http" {
opts = append(opts, otlpmetrichttp.WithInsecure())
}
if endpoint.Path != "" {
opts = append(opts, otlpmetrichttp.WithURLPath(endpoint.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.OtelGRPC) (sdkmetric.Exporter, error) {
host, port, err := net.SplitHostPort(config.Endpoint)
if err != nil {
return nil, fmt.Errorf("invalid collector endpoint %q: %w", config.Endpoint, 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 {
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c, _ := meter.Float64Counter(name,
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metric.WithDescription(desc),
metric.WithUnit("1"),
)
return &otelCounter{
ip: c,
}
}
type otelCounter struct {
labelNamesValues otelLabelNamesValues
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ip metric.Float64Counter
}
func (c *otelCounter) With(labelValues ...string) metrics.Counter {
return &otelCounter{
labelNamesValues: c.labelNamesValues.With(labelValues...),
ip: c.ip,
}
}
func (c *otelCounter) Add(delta float64) {
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c.ip.Add(context.Background(), delta, metric.WithAttributes(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,
}
}
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func newOTLPGaugeFrom(meter metric.Meter, name, desc string, unit string) *otelGauge {
openTelemetryGaugeCollector.values[name] = make(map[string]gaugeValue)
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c, _ := meter.Float64ObservableGauge(name,
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metric.WithDescription(desc),
metric.WithUnit(unit),
)
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_, err := meter.RegisterCallback(func(ctx context.Context, observer metric.Observer) error {
openTelemetryGaugeCollector.mu.Lock()
defer openTelemetryGaugeCollector.mu.Unlock()
values, exists := openTelemetryGaugeCollector.values[name]
if !exists {
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return nil
}
for _, value := range values {
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observer.ObserveFloat64(c, value.value, metric.WithAttributes(value.attributes.ToLabels()...))
}
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return nil
}, c)
if err != nil {
log.Err(err).Msg("Unable to register OpenTelemetry meter callback")
}
return &otelGauge{
ip: c,
name: name,
}
}
type otelGauge struct {
labelNamesValues otelLabelNamesValues
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ip metric.Float64ObservableGauge
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)
}
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func newOTLPHistogramFrom(meter metric.Meter, name, desc string, unit string) *otelHistogram {
c, _ := meter.Float64Histogram(name,
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metric.WithDescription(desc),
metric.WithUnit(unit),
)
return &otelHistogram{
ip: c,
}
}
type otelHistogram struct {
labelNamesValues otelLabelNamesValues
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ip metric.Float64Histogram
}
func (h *otelHistogram) With(labelValues ...string) metrics.Histogram {
return &otelHistogram{
labelNamesValues: h.labelNamesValues.With(labelValues...),
ip: h.ip,
}
}
func (h *otelHistogram) Observe(incr float64) {
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h.ip.Record(context.Background(), incr, metric.WithAttributes(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
}