Add optional Zero Threshold for Exponential Histograms to the metrics data model #2665
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beorn7
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This is a field that exists and is used in Prometheus Exponential Histograms and it would be nice to include it in OTel Exponential Histograms as well. You can see the reference implementation here: https://github.com/prometheus/prometheus/blob/5937b4f5d4f658758f4aa6b9ab803f022e6e5497/model/histogram/float_histogram.go#L186-L197 https://github.com/prometheus/prometheus/blob/5937b4f5d4f658758f4aa6b9ab803f022e6e5497/model/histogram/float_histogram.go#L770-L790 Signed-off-by: Goutham Veeramachaneni <[email protected]>
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jsuereth
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Signed-off-by: Goutham Veeramachaneni <[email protected]>
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@gouthamve I changed the PR title to limit its scope to match what's currently reviewed. I think after this merges, we're free to add it in the protocol for OTLP v0.20. Separately, we'll update ./sdk.md to say that expo-histos will accept an option and will have a default behavior w.r.t. this new thing--this we can debate later. |
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This is a follow up of #2611 and the Prometheus WG call from June 22, 2022.
Changes
This discusses the
zero_thresholdfield that exists and is used in Prometheus Exponential Histograms and it would be nice to include it in OTel Exponential Histograms as well.You can see the reference implementation here:
https://github.com/prometheus/prometheus/blob/5937b4f5d4f658758f4aa6b9ab803f022e6e5497/model/histogram/float_histogram.go#L186-L197
https://github.com/prometheus/prometheus/blob/5937b4f5d4f658758f4aa6b9ab803f022e6e5497/model/histogram/float_histogram.go#L770-L790
Prometheus also uses it (increases
zero_threshold) to limit the number of buckets: https://github.com/prometheus/client_golang/blob/5a321c7b05264e54d2dbc86f12d9b80d4e7a492b/prometheus/histogram.go#L773-L808DDSketch from Datadog uses something similar to limit the number of buckets (they expand the lowest bucket, not zero bucket but same principle).
Related issues #2611