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System.Diagnostics.Metrics out of proc monitoring improved histogram support #109388

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Open
Tracked by #109396
CodeBlanch opened this issue Oct 30, 2024 · 1 comment · May be fixed by #115852
Open
Tracked by #109396

System.Diagnostics.Metrics out of proc monitoring improved histogram support #109388

CodeBlanch opened this issue Oct 30, 2024 · 1 comment · May be fixed by #115852
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area-System.Diagnostics.Metric
Milestone
10.0.0

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@CodeBlanch
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Today when listening to metrics via MetricsEventSource histograms are represented as OpenTelemetry summary metrics (more or less).

Summary metrics work well with Prometheus but aren't as well-supported or feature rich as explicit bucket histograms or base2 exponential histograms.

Requesting for .NET 10 we add the ability to opt-into additional histogram types.

Don't have a design yet. Only thoughts...

  • Explicit bucket histograms

    • Users should be able to specify custom buckets...
    • Else advice buckets should be respected...
    • Else default buckets should be used.

  • Base2 exponential histograms

    • Users should be able to specify MaxSize and MaxScale...
    • Else defaults should be used.

Do we need both? Base2 exponential histogram is the more flexible type as it dynamically adjusts to the values. But it is a newer thing and may not be supported by enough backends to be generally useful.
@dotnet-policy-service dotnet-policy-service bot added the untriaged New issue has not been triaged by the area owner label Oct 30, 2024
@tarekgh tarekgh added this to the 10.0.0 milestone Oct 30, 2024
@tarekgh tarekgh removed the untriaged New issue has not been triaged by the area owner label Oct 30, 2024
@tarekgh tarekgh mentioned this issue Oct 31, 2024
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@tarekgh tarekgh linked a pull request May 21, 2025 that will close this issue
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@rajkumar-rangaraj
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Supporting two types of histograms current default and e2 should be sufficient for .NET 10. The new e2 histogram could be an opt-in. Additional histogram types can be considered in the future based on demand raised through the issue.

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Support out of proc Histogram Base 2 Exponential aggregation tarekgh/runtime
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@rajkumar-rangaraj @tarekgh @CodeBlanch