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fix(om2): histograms and negative observed values #2627

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Merged
merged 5 commits into from
Aug 13, 2025
Merged

fix(om2): histograms and negative observed values #2627

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3b7d783
fix(om2): histograms and negative observed values
krajorama Apr 17, 2025
45476ec
Reduce the diff
krajorama Apr 23, 2025
c5b2799
fix wording
krajorama Apr 23, 2025
d06bcc8
fix(om2) remove the changelog
krajorama May 1, 2025
df80801
Merge remote-tracking branch 'origin/main' into krajo/om2.0-nonosum
krajorama Aug 13, 2025
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7 changes: 5 additions & 2 deletions content/docs/specs/om/open_metrics_spec_2_0.md
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Expand Up @@ -224,8 +224,11 @@ Histogram MetricPoints MUST have one bucket with an +Inf threshold. Buckets MUST

The +Inf bucket counts all requests. If present, the Sum value MUST equal the Sum of all the measured event values. Bucket thresholds within a MetricPoint MUST be unique.

Semantically, Sum, and buckets values are counters so MUST NOT be NaN or negative.
Negative threshold buckets MAY be used, but then the Histogram MetricPoint MUST NOT contain a sum value as it would no longer be a counter semantically. Bucket thresholds MUST NOT equal NaN. Count and bucket values MUST be integers.
Semantically, buckets values are counters so MUST NOT be NaN or negative.

The Sum is only a counter semantically as long as there are no negative event values measured by the Histogram MetricPoint. The Sum MUST NOT be NaN.

Negative threshold buckets MAY be used. Bucket thresholds MUST NOT equal NaN. Count and bucket values MUST be integers.

A Histogram MetricPoint SHOULD have a Timestamp value called Created. This can help ingestors discern between new metrics and long-running ones it did not see before.

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