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Add basic metrics to example server #499
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tigrannajaryan
merged 2 commits into
open-telemetry:main
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michel-laterman:enhancement/example-server-metrics
Mar 4, 2026
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,90 @@ | ||
| package opampsrv | ||
|
|
||
| import ( | ||
| "context" | ||
| "io" | ||
|
|
||
| "go.opentelemetry.io/otel" | ||
| "go.opentelemetry.io/otel/attribute" | ||
| "go.opentelemetry.io/otel/exporters/stdout/stdoutmetric" | ||
| "go.opentelemetry.io/otel/metric" | ||
| sdkmetric "go.opentelemetry.io/otel/sdk/metric" | ||
| otelresource "go.opentelemetry.io/otel/sdk/resource" | ||
| semconv "go.opentelemetry.io/otel/semconv/v1.4.0" | ||
| ) | ||
|
|
||
| var ( | ||
| opampReadErrAttr = attribute.String("error.type", "read") | ||
| opampRespErrAttr = attribute.String("error.type", "resp") | ||
| ) | ||
|
|
||
| // metricsTracker is a struct to encasulate all metrics the OpAMP server tracks. | ||
| type metricsTracker struct { | ||
| connCounter metric.Int64UpDownCounter | ||
| errCounter metric.Int64Counter | ||
| meter metric.Meter | ||
|
|
||
| resource *otelresource.Resource | ||
| exporter sdkmetric.Exporter | ||
| } | ||
|
|
||
| func NewMetricsTracker(emitMetrics bool) (*metricsTracker, error) { | ||
| resource, err := otelresource.New(context.Background(), | ||
| otelresource.WithAttributes( | ||
| semconv.ServiceNameKey.String("io.opentelemetry.opampserver"), | ||
| semconv.ServiceVersionKey.String("0.1.0"), | ||
| ), | ||
| ) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| exporterOpts := []stdoutmetric.Option{stdoutmetric.WithPrettyPrint()} | ||
| if !emitMetrics { | ||
| exporterOpts = append(exporterOpts, stdoutmetric.WithWriter(io.Discard)) | ||
| } | ||
|
|
||
| exporter, err := stdoutmetric.New(exporterOpts...) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| meterProvider := sdkmetric.NewMeterProvider( | ||
| sdkmetric.WithResource(resource), | ||
| sdkmetric.WithReader(sdkmetric.NewPeriodicReader(exporter)), | ||
| ) | ||
| otel.SetMeterProvider(meterProvider) | ||
| meter := otel.Meter("opamp") | ||
| connCounter, err := meter.Int64UpDownCounter("connections.active.count") | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| errCounter, err := meter.Int64Counter("connections.error.count") | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| return &metricsTracker{ | ||
| connCounter: connCounter, | ||
| errCounter: errCounter, | ||
| meter: meter, | ||
| resource: resource, | ||
| exporter: exporter, | ||
| }, nil | ||
| } | ||
|
|
||
| func (m *metricsTracker) OnConnected(ctx context.Context) { | ||
| m.connCounter.Add(ctx, 1) | ||
| } | ||
|
|
||
| func (m *metricsTracker) OnDisconnect(ctx context.Context) { | ||
| m.connCounter.Add(ctx, -1) | ||
| } | ||
|
|
||
| func (m *metricsTracker) OnReadMessageError(ctx context.Context) { | ||
| m.errCounter.Add(ctx, 1, metric.WithAttributes(opampReadErrAttr)) | ||
| } | ||
|
|
||
| func (m *metricsTracker) OnMessageResponseError(ctx context.Context) { | ||
| m.errCounter.Add(ctx, 1, metric.WithAttributes(opampRespErrAttr)) | ||
| } | ||
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