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Fix OpenMetrics valid label keys, and specify prometheus conversion for metric name. #2788

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merged 4 commits into from
Sep 19, 2022
Merged

Fix OpenMetrics valid label keys, and specify prometheus conversion for metric name. #2788

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3502920
fix OpenMetrics valid label keys, and specify prometheus conversion f…
dashpole Sep 12, 2022
d61d50a
deduplicate underscores and fix formatting
dashpole Sep 13, 2022
1805a94
Merge branch 'main' into fix_prom_regex
dashpole Sep 16, 2022
6891620
Merge branch 'main' into fix_prom_regex
bogdandrutu Sep 19, 2022
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26 changes: 25 additions & 1 deletion specification/metrics/data-model.md
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Original file line number Diff line number Diff line change
Expand Up @@ -1306,6 +1306,10 @@ OpenTelemetry metric data. Since OpenMetrics has a superset of Prometheus' types

#### Metric Metadata

The [OpenMetrics MetricFamily Name](https://github.com/OpenObservability/OpenMetrics/blob/main/specification/OpenMetrics.md#metricfamily)
MUST be added as the Name of the OTLP metric after the removal of unit and type
suffixes described below.

The [OpenMetrics UNIT metadata](https://github.com/OpenObservability/OpenMetrics/blob/main/specification/OpenMetrics.md#metricfamily),
if present, MUST be converted to the unit of the OTLP metric. After trimming
type-specific suffixes, such as `_total` for counters, the unit MUST be trimmed
Expand Down Expand Up @@ -1420,6 +1424,13 @@ in keys).

#### Metric Metadata

The Name of an OTLP metric MUST be added as the
[OpenMetrics MetricFamily Name](https://github.com/OpenObservability/OpenMetrics/blob/main/specification/OpenMetrics.md#metricfamily),
with unit and type suffixes added as described below. The metric name is
required to match the regex: `[a-zA-Z_:]([a-zA-Z0-9_:])*`. Invalid characters
in the metric name MUST be replaced with the `_` character. Multiple
consecutive `_` characters MUST be replaced with a single `_` character.

The Unit of an OTLP metric point MUST be added as
[OpenMetrics UNIT metadata](https://github.com/OpenObservability/OpenMetrics/blob/main/specification/OpenMetrics.md#metricfamily).
Additionally, the unit MUST be added as a suffix to the metric name, and SHOULD
Expand Down Expand Up @@ -1488,7 +1499,20 @@ The following OTLP data points MUST be dropped:

#### Metric Attributes

OpenTelemetry Metric Attributes MUST be converted to [Prometheus labels](https://Prometheus.io/docs/concepts/data_model/#metric-names-and-labels). String Attribute values are converted directly to Metric Attributes, and non-string Attribute values MUST be converted to string attributes following the [attribute specification](../common/README.md#attribute). Prometheus metric label keys are required to match the following regex: `[a-zA-Z_:]([a-zA-Z0-9_:])*`. Metrics from OpenTelemetry with unsupported Attribute names MUST replace invalid characters with the `_` character. This may cause ambiguity in scenarios where multiple similar-named attributes share invalid characters at the same location. In such unlikely cases, if multiple key-value pairs are converted to have the same Prometheus key, the values MUST be concatenated together, separated by `;`, and ordered by the lexicographical order of the original keys.
OpenTelemetry Metric Attributes MUST be converted to
[Prometheus labels](https://Prometheus.io/docs/concepts/data_model/#metric-names-and-labels).
String Attribute values are converted directly to Metric Attributes, and
non-string Attribute values MUST be converted to string attributes following
the [attribute specification](../common/README.md#attribute). Prometheus
metric label keys are required to match the following regex:
`[a-zA-Z_]([a-zA-Z0-9_])*`. Metrics from OpenTelemetry with unsupported
Attribute names MUST replace invalid characters with the `_` character.
Multiple consecutive `_` characters MUST be replaced with a single `_`
character. This may cause ambiguity in scenarios where multiple similar-named
attributes share invalid characters at the same location. In such unlikely
cases, if multiple key-value pairs are converted to have the same Prometheus
key, the values MUST be concatenated together, separated by `;`, and ordered by
the lexicographical order of the original keys.

#### Exemplars

Expand Down