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Clarify that unit must be a suffix for metric names for Prometheus #4057

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merged 3 commits into from
May 24, 2024
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Clarify that unit must be a suffix for metric names for Prometheus #4057

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3dfb383
clarify that unit must be a suffix for metric names
dashpole May 23, 2024
3786e62
clarify that the unit metadata must be omitted if the unit suffix is …
dashpole May 24, 2024
d86989d
Merge branch 'main' into clarify_unit_location
reyang May 24, 2024
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3 changes: 3 additions & 0 deletions CHANGELOG.md
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Expand Up @@ -26,6 +26,9 @@ release.

### Compatibility

- Prometheus: Clarify location of unit suffix within metric names.
([#4057](https://github.com/open-telemetry/opentelemetry-specification/pull/4057))

### SDK Configuration

### Common
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6 changes: 3 additions & 3 deletions specification/compatibility/prometheus_and_openmetrics.md
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Expand Up @@ -267,9 +267,9 @@ The Unit of an OTLP metric point SHOULD be converted to the equivalent unit in P

The resulting unit SHOULD be added to the metric as
[UNIT metadata](https://github.com/OpenObservability/OpenMetrics/blob/main/specification/OpenMetrics.md#metricfamily)
and as a suffix to the metric name unless the metric name already contains the
unit, or the unit MUST be omitted. The unit suffix comes before any
type-specific suffixes.
and as a suffix to the metric name unless the metric name already ends with the
unit (before type-specific suffixes), or the unit metadata MUST be omitted. The
unit suffix comes before any type-specific suffixes.

The description of an OTLP metrics point MUST be added as
[HELP metadata](https://prometheus.io/docs/instrumenting/exposition_formats/#comments-help-text-and-type-information).
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