8000 return histograms for time metrics by Keksoj · Pull Request #1005 · sozu-proxy/sozu · GitHub
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Merged
merged 2 commits into from
Jul 11, 2024
Merged

return histograms for time metrics #1005

merged 2 commits into from
Jul 11, 2024

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Keksoj
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@Keksoj Keksoj commented Oct 18, 2023

Up until now, time metrics were returned by Sōzu, and rendered in the CLI, as percentiles:

┌────────────────────────┬─────────┬──────┬──────┬──────┬───────┬────────┬─────────┬──────┐
│ Percentiles            │ samples │ p50  │ p90  │ p99  │ p99.9 │ p99.99 │ p99.999 │ p100 │
├────────────────────────┼─────────┼──────┼──────┼──────┼───────┼────────┼─────────┼──────┤
│ accept_queue.wait_time │ 6       │ 0    │ 0    │ 0    │ 0     │ 0      │ 0       │ 0    │
├────────────────────────┼─────────┼──────┼──────┼──────┼───────┼────────┼─────────┼──────┤
│ epoll_time             │ 40      │ 1000 │ 1001 │ 1001 │ 1001  │ 1001   │ 1001    │ 1001 │
├────────────────────────┼─────────┼──────┼──────┼──────┼───────┼────────┼─────────┼──────┤
│ event_loop_time        │ 40      │ 0    │ 0    │ 4    │ 4     │ 4      │ 4       │ 4    │
├────────────────────────┼─────────┼──────┼──────┼──────┼───────┼────────┼─────────┼──────┤
│ response_time          │ 6       │ 0    │ 0    │ 0    │ 0     │ 0      │ 0       │ 0    │
├────────────────────────┼─────────┼──────┼──────┼──────┼───────┼────────┼─────────┼──────┤
│ service_time           │ 6       │ 0    │ 0    │ 0    │ 0     │ 0      │ 0       │ 0    │
└────────────────────────┴─────────┴──────┴──────┴──────┴───────┴────────┴─────────┴──────┘

These percentiles are not convertible for a prometheus layer, however.

Since the time metrics are collected by sozu_lib's LocalDrain as hdrhistograms, why not return them in a histogram form as well? This would allow the Sozu prometheus connector to convert them to prometheus metrics.

This PR creates the protobuf type FilteredHistogram. Now, for each time metric:

  1. a Percentiles metric is produced, for instance response_time
  2. a FilteredHistogram is produced, named response_time_hist

@Keksoj Keksoj added this to the v0.16.0 milestone Oct 18, 2023
@Keksoj Keksoj self-assigned this Oct 18, 2023
@Keksoj Keksoj requested a review from Wonshtrum as a code owner October 18, 2023 13:30
@Keksoj Keksoj force-pushed the produce-histogram-metrics branch from 2e0ddae to b13edc4 Compare October 18, 2023 13:34
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Keksoj commented Oct 26, 2023

Check issue #751 for inspiration

@Keksoj Keksoj force-pushed the produce-histogram-metrics branch from b13edc4 to 0e42e87 Compare October 26, 2023 12:18
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Keksoj commented Nov 16, 2023

Actually I need to rebase the branch of PR #1004 into this one. #1004 refactors the display of metrics in a much cleaner way, and allows a way better display of JSON. This is crucial for development purposes.

@Keksoj Keksoj force-pushed the produce-histogram-metrics branch from 0e42e87 to 1dd764f Compare November 16, 2023 21:34
@Keksoj Keksoj changed the base branch from main to fix-display-in-json-form November 16, 2023 21:35
@Keksoj Keksoj force-pushed the produce-histogram-metrics branch 3 times, most recently from f9a9218 to aa9df5f Compare November 20, 2023 12:05
@Keksoj Keksoj mentioned this pull request Nov 20, 2023
Merged
@Keksoj Keksoj force-pushed the produce-histogram-metrics branch from aa9df5f to 89da50b Compare November 21, 2023 11:53
@Keksoj Keksoj force-pushed the fix-display-in-json-form branch 2 times, most recently from f0ba2cd to 88fb8cb Compare November 27, 2023 14:19
@Keksoj Keksoj force-pushed the fix-display-in-json-form branch from 88fb8cb to 86303a2 Compare December 6, 2023 16:08
@Keksoj Keksoj changed the base branch from fix-display-in-json-form to main January 24, 2024 09:38
@Keksoj Keksoj force-pushed the produce-histogram-metrics branch 3 times, most recently from 8866640 to 0f9f6d7 Compare January 24, 2024 13:39
@Keksoj Keksoj changed the title return histograms for time metrics draft: return histograms for time metrics Feb 19, 2024
@Keksoj Keksoj force-pushed the produce-histogram-metrics branch 4 times, most recently from 7ed28fe to c0ab1fb Compare July 8, 2024 09:16
@Keksoj Keksoj changed the title draft: return histograms for time metrics return histograms for time metrics Jul 8, 2024
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Keksoj commented Jul 8, 2024

This is ready for review!

llenotre
llenotre reviewed Jul 8, 2024
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@Keksoj Keksoj force-pushed the produce-histogram-metrics branch 6 times, most recently from 8b43018 to 4894e69 Compare July 11, 2024 08:03
Keksoj added 2 commits July 11, 2024 16:24
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metrics: return histograms for time metrics
64b558e 
create local type MetricsMap
implement receive_metric function for local types
add error management
iterate logarithmically (base 2) to produce prometheus buckets

optimize the listing of available metrics, with iterators
optimize function dump_cluster_metrics
@Keksoj
fix AggregatedMetrics::merge_metrics
15ac8eb 
the method would insert non-mergeable backend metrics.
@Keksoj Keksoj force-pushed the produce-histogram-metrics branch from 4894e69 to 15ac8eb Compare July 11, 2024 14:26
@Keksoj Keksoj merged commit b2965c0 into main Jul 11, 2024
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@llenotre llenotre llenotre approved these changes

@FlorentinDUBOIS FlorentinDUBOIS Awaiting requested review from FlorentinDUBOIS FlorentinDUBOIS is a code owner

@Wonshtrum Wonshtrum Awaiting requested review from Wonshtrum Wonshtrum is a code owner

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@Keksoj Keksoj

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enhancement metrics protobuf
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