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feat(om2): exemplar timestamp MAY to SHOULD #2775

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feat(om2): exemplar timestamp MAY to SHOULD #2775

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2 changes: 1 addition & 1 deletion docs/specs/om/open_metrics_spec_2_0.md
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Expand Up @@ -108,7 +108,7 @@ Each MetricPoint consists of a set of values, depending on the MetricFamily type

Exemplars are references to data outside of the MetricSet. A common use case are IDs of program traces.

Exemplars MUST consist of a LabelSet and a value, and MAY have a timestamp. They MAY each be different from the MetricPoints' LabelSet and timestamp.
Exemplars MUST consist of a LabelSet and a value, and SHOULD have a timestamp. They MAY each be different from the MetricPoints' LabelSet and timestamp.

The combined length of the label names and values of an Exemplar's LabelSet MUST NOT exceed 128 UTF-8 character code points. Other characters in the text rendering of an exemplar such as `",=` are not included in this limit for implementation simplicity and for consistency between the text and proto formats.

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