diff --git a/CHANGELOG.md b/CHANGELOG.md index 3a5de1edb..c6fe8f662 100644 --- a/CHANGELOG.md +++ b/CHANGELOG.md @@ -19,6 +19,7 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm - Identify the `Tracer` returned from the global `TracerProvider` in `go.opentelemetry.io/otel/global` with its schema URL. (#5426) - Identify the `Meter` returned from the global `MeterProvider` in `go.opentelemetry.io/otel/global` with its schema URL. (#5426) - Log a warning to the OpenTelemetry internal logger when a `Span` in `go.opentelemetry.io/otel/sdk/trace` drops an attribute, event, or link due to a limit being reached. (#5434) +- Document instrument name requirements in `go.opentelemetry.io/otel/metric`. (#5435) ## [1.27.0/0.49.0/0.3.0] 2024-05-21 diff --git a/metric/doc.go b/metric/doc.go index 075234b33..f153745b0 100644 --- a/metric/doc.go +++ b/metric/doc.go @@ -57,6 +57,23 @@ asynchronous measurement, a Gauge ([Int64ObservableGauge] and See the [OpenTelemetry documentation] for more information about instruments and their intended use. +# Instrument Name + +OpenTelemetry defines an [instrument name syntax] that restricts what +instrument names are allowed. + +Instrument names should ... + + - Not be empty. + - Have an alphabetic character as their first letter. + - Have any letter after the first be an alphanumeric character, ‘_’, ‘.’, + ‘-’, or ‘/’. + - Have a maximum length of 255 letters. + +To ensure compatibility with observability platforms, all instruments created +need to conform to this syntax. Not all implementations of the API will validate +these names, it is the callers responsibility to ensure compliance. + # Measurements Measurements are made by recording values and information about the values with @@ -153,6 +170,7 @@ It is strongly recommended that authors only embed That implementation is the only one OpenTelemetry authors can guarantee will fully implement all the API interfaces when a user updates their API. +[instrument name syntax]: https://opentelemetry.io/docs/specs/otel/metrics/api/#instrument-name-syntax [OpenTelemetry documentation]: https://opentelemetry.io/docs/concepts/signals/metrics/ [GetMeterProvider]: https://pkg.go.dev/go.opentelemetry.io/otel#GetMeterProvider */ diff --git a/metric/meter.go b/metric/meter.go index 460b3f9b0..6a7991e01 100644 --- a/metric/meter.go +++ b/metric/meter.go @@ -47,20 +47,36 @@ type Meter interface { // Int64Counter returns a new Int64Counter instrument identified by name // and configured with options. The instrument is used to synchronously // record increasing int64 measurements during a computational operation. + // + // The name needs to conform to the OpenTelemetry instrument name syntax. + // See the Instrument Name section of the package documentation for more + // information. Int64Counter(name string, options ...Int64CounterOption) (Int64Counter, error) // Int64UpDownCounter returns a new Int64UpDownCounter instrument // identified by name and configured with options. The instrument is used // to synchronously record int64 measurements during a computational // operation. + // + // The name needs to conform to the OpenTelemetry instrument name syntax. + // See the Instrument Name section of the package documentation for more + // information. Int64UpDownCounter(name string, options ...Int64UpDownCounterOption) (Int64UpDownCounter, error) // Int64Histogram returns a new Int64Histogram instrument identified by // name and configured with options. The instrument is used to // synchronously record the distribution of int64 measurements during a // computational operation. + // + // The name needs to conform to the OpenTelemetry instrument name syntax. + // See the Instrument Name section of the package documentation for more + // information. Int64Histogram(name string, options ...Int64HistogramOption) (Int64Histogram, error) // Int64Gauge returns a new Int64Gauge instrument identified by name and // configured with options. The instrument is used to synchronously record // instantaneous int64 measurements during a computational operation. + // + // The name needs to conform to the OpenTelemetry instrument name syntax. + // See the Instrument Name section of the package documentation for more + // information. Int64Gauge(name string, options ...Int64GaugeOption) (Int64Gauge, error) // Int64ObservableCounter returns a new Int64ObservableCounter identified // by name and configured with options. The instrument is used to @@ -71,6 +87,10 @@ type Meter interface { // the WithInt64Callback option to register the callback here, or use the // RegisterCallback method of this Meter to register one later. See the // Measurements section of the package documentation for more information. + // + // The name needs to conform to the OpenTelemetry instrument name syntax. + // See the Instrument Name section of the package documentation for more + // information. Int64ObservableCounter(name string, options ...Int64ObservableCounterOption) (Int64ObservableCounter, error) // Int64ObservableUpDownCounter returns a new Int64ObservableUpDownCounter // instrument identified by name and configured with options. The @@ -81,6 +101,10 @@ type Meter interface { // the WithInt64Callback option to register the callback here, or use the // RegisterCallback method of this Meter to register one later. See the // Measurements section of the package documentation for more information. + // + // The name needs to conform to the OpenTelemetry instrument name syntax. + // See the Instrument Name section of the package documentation for more + // information. Int64ObservableUpDownCounter(name string, options ...Int64ObservableUpDownCounterOption) (Int64ObservableUpDownCounter, error) // Int64ObservableGauge returns a new Int64ObservableGauge instrument // identified by name and configured with options. The instrument is used @@ -91,26 +115,46 @@ type Meter interface { // the WithInt64Callback option to register the callback here, or use the // RegisterCallback method of this Meter to register one later. See the // Measurements section of the package documentation for more information. + // + // The name needs to conform to the OpenTelemetry instrument name syntax. + // See the Instrument Name section of the package documentation for more + // information. Int64ObservableGauge(name string, options ...Int64ObservableGaugeOption) (Int64ObservableGauge, error) // Float64Counter returns a new Float64Counter instrument identified by // name and configured with options. The instrument is used to // synchronously record increasing float64 measurements during a // computational operation. + // + // The name needs to conform to the OpenTelemetry instrument name syntax. + // See the Instrument Name section of the package documentation for more + // information. Float64Counter(name string, options ...Float64CounterOption) (Float64Counter, error) // Float64UpDownCounter returns a new Float64UpDownCounter instrument // identified by name and configured with options. The instrument is used // to synchronously record float64 measurements during a computational // operation. + // + // The name needs to conform to the OpenTelemetry instrument name syntax. + // See the Instrument Name section of the package documentation for more + // information. Float64UpDownCounter(name string, options ...Float64UpDownCounterOption) (Float64UpDownCounter, error) // Float64Histogram returns a new Float64Histogram instrument identified by // name and configured with options. The instrument is used to // synchronously record the distribution of float64 measurements during a // computational operation. + // + // The name needs to conform to the OpenTelemetry instrument name syntax. + // See the Instrument Name section of the package documentation for more + // information. Float64Histogram(name string, options ...Float64HistogramOption) (Float64Histogram, error) // Float64Gauge returns a new Float64Gauge instrument identified by name and // configured with options. The instrument is used to synchronously record // instantaneous float64 measurements during a computational operation. + // + // The name needs to conform to the OpenTelemetry instrument name syntax. + // See the Instrument Name section of the package documentation for more + // information. Float64Gauge(name string, options ...Float64GaugeOption) (Float64Gauge, error) // Float64ObservableCounter returns a new Float64ObservableCounter // instrument identified by name and configured with options. The @@ -121,6 +165,10 @@ type Meter interface { // the WithFloat64Callback option to register the callback here, or use the // RegisterCallback method of this Meter to register one later. See the // Measurements section of the package documentation for more information. + // + // The name needs to conform to the OpenTelemetry instrument name syntax. + // See the Instrument Name section of the package documentation for more + // information. Float64ObservableCounter(name string, options ...Float64ObservableCounterOption) (Float64ObservableCounter, error) // Float64ObservableUpDownCounter returns a new // Float64ObservableUpDownCounter instrument identified by name and @@ -131,6 +179,10 @@ type Meter interface { // the WithFloat64Callback option to register the callback here, or use the // RegisterCallback method of this Meter to register one later. See the // Measurements section of the package documentation for more information. + // + // The name needs to conform to the OpenTelemetry instrument name syntax. + // See the Instrument Name section of the package documentation for more + // information. Float64ObservableUpDownCounter(name string, options ...Float64ObservableUpDownCounterOption) (Float64ObservableUpDownCounter, error) // Float64ObservableGauge returns a new Float64ObservableGauge instrument // identified by name and configured with options. The instrument is used @@ -141,6 +193,10 @@ type Meter interface { // the WithFloat64Callback option to register the callback here, or use the // RegisterCallback method of this Meter to register one later. See the // Measurements section of the package documentation for more information. + // + // The name needs to conform to the OpenTelemetry instrument name syntax. + // See the Instrument Name section of the package documentation for more + // information. Float64ObservableGauge(name string, options ...Float64ObservableGaugeOption) (Float64ObservableGauge, error) // RegisterCallback registers f to be called during the collection of a