[exporter/datadog] Add support for delta exponential histograms #8350
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mx-psi
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exporter/datadogexporter/internal/model/translator/exponential_histograms_translator.go
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exporter/datadogexporter/internal/model/translator/exponential_histograms_translator_test.go
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There are a bunch of conflicts that need to be solved here |
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This PR was marked stale due to lack of activity. It will be closed in 14 days. |
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This PR was marked stale due to lack of activity. It will be closed in 14 days. |
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If you mark it as ready for review, I think we can mark this as ready to merge 🎉 |
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…-telemetry#8350) * [WIP] Add ExponentialHistogram support * Do not support cumulative expHists for now * Add unit tests * Update go.mod / go.sum * Fix rebase conflicts * Add MapMetrics tests * Fix go mod tidy errors * Update github.com/DataDog/datadog-agent/pkg/quantile * Refactor store creation in toStore method * Refactor tests to use public MapMetrics function * Add benchmarks * Update DataDog/datadog-agent/pkg/quantile version
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Description:
Adds support for exporting delta exponential histograms as sketches to Datadog. The conversion is done as follows:
ExponentialHistogram -> DDSketch (done here by copying the buckets, with the same scale)
DDSketch -> Agent Sketch (done by
github.com/DataDog/datadog-agent/pkg/quantile, in this PR)Optionally, the count and sum of the exponential histogram can also be sent as metrics. This behavior is managed by the
histograms.send_count_sum_metrics(the same that is used for histograms - should it be a different one?).Cumulative histograms are left out for now (they'll require more involved changes, notably to compute the diff between two exponential histograms) and will be done in a later PR.
Note: this PR currently used unreleased versions of
github.com/DataDog/sketches-goandgithub.com/DataDog/datadog-agent/pkg/quantilethat will be released at a later date. Once this happens, the go.mod should point to released versions.Link to tracking Issue: n/a
Testing: Added unit tests, as well as benchmarks for gauges, delta sums and delta exponential histograms, for comparison purposes.
Documentation: n/a