diff --git a/CHANGELOG.md b/CHANGELOG.md index 87b7199..a90c249 100644 --- a/CHANGELOG.md +++ b/CHANGELOG.md @@ -21,6 +21,9 @@ release. ### Compatibility +- Specify how Prometheus exporters and receivers handle instrumentation scope. + ([#2703](https://github.com/open-telemetry/opentelemetry-specification/pull/2703)). + ### OpenTelemetry Protocol ### SDK Configuration diff --git a/specification/metrics/data-model.md b/specification/metrics/data-model.md index 24e162c..d1ba549 100644 --- a/specification/metrics/data-model.md +++ b/specification/metrics/data-model.md @@ -66,9 +66,11 @@ linkTitle: Data Model + [Dropped Types](#dropped-types) + [Start Time](#start-time) + [Exemplars](#exemplars-1) + + [Instrumentation Scope](#instrumentation-scope) + [Resource Attributes](#resource-attributes) * [OTLP Metric points to Prometheus](#otlp-metric-points-to-prometheus) + [Metric Metadata](#metric-metadata-1) + + [Instrumentation Scope](#instrumentation-scope-1) + [Gauges](#gauges-1) + [Sums](#sums-1) + [Histograms](#histograms-1) @@ -1385,6 +1387,47 @@ retrieved from the `trace_id` and `span_id` label keys, respectively. All labels not used for the trace and span ids MUST be added to the OpenTelemetry exemplar as attributes. +#### Instrumentation Scope + +Each `otel_scope_info` metric point present in a batch of metrics +SHOULD be dropped from the incoming scrape, and converted to an instrumentation +scope. The `otel_scope_name` and `otel_scope_version` labels, if present, MUST +be converted to the Name and Version of the Instrumentation Scope. Additional +labels MUST be added as scope attributes, with keys and values unaltered. Other +metrics in the batch which have `otel_scope_name` and `otel_scope_version` +labels that match an instrumentation scope MUST be placed within the matching +instrumentation scope, and MUST remove those labels. For example, the +OpenMetrics metrics: + +``` +# TYPE otel_scope_info info +otel_scope_info{otel_scope_name="go.opentelemetry.io.contrib.instrumentation.net.http.otelhttp",otel_scope_version="v0.24.0",library_mascot="bear"} 1 +# TYPE http_server_duration counter +http_server_duration{otel_scope_name="go.opentelemetry.io.contrib.instrumentation.net.http.otelhttp",otel_scope_version="v0.24.0"...} 1 +``` + +becomes: + +```yaml +# within a resource_metrics +scope_metrics: + scope: + name: go.opentelemetry.io.contrib.instrumentation.net.http.otelhttp + version: v0.24.0 + attributes: + library_mascot: bear + metrics: + - name: http_server_duration + data: + sum: + data_points: + - value: 1 +``` + +Metrics which are not found to be associated with an instrumentation scope MUST +all be placed within an empty instrumentation scope, and MUST not have any labels +removed. + #### Resource Attributes When scraping a Prometheus endpoint, resource attributes MUST be added to the @@ -1445,6 +1488,22 @@ The data point type of an OTLP metric MUST be added as [OpenMetrics TYPE metadata](https://github.com/OpenObservability/OpenMetrics/blob/main/specification/OpenMetrics.md#metricfamily). It also dictates type-specific conversion rules listed below. +#### Instrumentation Scope + +Prometheus exporters SHOULD generate an [Info](https://github.com/OpenObservability/OpenMetrics/blob/main/specification/OpenMetrics.md#info)-typed +metric named `otel_scope_info`. If present, Instrumentation Scope +`name` and `version` MUST be added as `otel_scope_name` and +`otel_scope_version` labels. Scope attributes MUST also be added as labels +following the rules described in the [`Metric Attributes`](#metric-attributes) +section below. + +Prometheus exporters MUST add the scope name as the `otel_scope_name` label and +the scope version as the `otel_scope_version` label on all metric points by +default. + +Prometheus exporters SHOULD provide a configuration option to disable the +`otel_scope_info` metric and `otel_scope_` labels. + #### Gauges An [OpenTelemetry Gauge](#gauge) MUST be converted to a Prometheus Gauge.