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Better sampling override behavior #4014

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Merged
trask merged 14 commits into from
Feb 24, 2025
Merged

Better sampling override behavior #4014

trask merged 14 commits into from
Feb 24, 2025

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@trask trask commented Jan 9, 2025 •
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(icm 577578458)

Currently, this configuration:

      {
        "telemetryType": "request",
        "attributes": [
          {
            "key": "http.url",
            "value": ".*/health-check",
            "matchType": "regexp"
          }
        ],
        "percentage": 0,
        "id": "filter out health check"
      },
      {
        "telemetryType": "dependency",
        "attributes": [
          {
            "key": "db.statement",
            "value": "select count(*) from abc",
            "matchType": "strict"
          }
        ],
        "percentage": 50,
        "id": "filter out noisy jdbc"
      }

has the unexpected effect of capturing 50% of select count(*) from abc calls, even when they occur within the excluded health check.

this PR updates the behavior so that when a sampling override percentage is <100 and a parent dropped, then the span (with override percentage < 100) will also be dropped

@trask trask force-pushed the sampling-override-behavior branch 2 times, most recently from 59be9a0 to 97276ab Compare January 14, 2025 03:13
@trask trask changed the title More expected sampling override behavior Better sampling override behavior Jan 14, 2025
@trask trask force-pushed the sampling-override-behavior branch from 97276ab to 90d4ada Compare January 22, 2025 03:14
@trask trask force-pushed the sampling-override-behavior branch from 90d4ada to 11b4832 Compare January 22, 2025 03:15
@trask trask marked this pull request as ready for review January 22, 2025 15:31
jeanbisutti
jeanbisutti reviewed Feb 19, 2025
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Could you please make the PR title more specific? Perhaps something like "Propagate the request sampling percentage"?

jeanbisutti
jeanbisutti reviewed Feb 20, 2025
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...rc/main/java/com/microsoft/applicationinsights/agent/internal/exporter/AgentLogExporter.java
if (!hasSamplingOverride
&& spanContext.isValid()
&& !spanContext.getTraceFlags().isSampled()) {
// if there is no sampling override, and the log is part of an unsampled trace,
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@jeanbisutti jeanbisutti Feb 20, 2025 •
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Because the scenarios are not super simple, the code comments could maybe try to refer to tests checking this scenario

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@trask trask Feb 21, 2025

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I totally agree that the scenarios are complex, this particular comment though I think it pretty clear (relatively, at least, compared to some of the other code in this PR)? maybe you had in mind other places?

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My suggestion was to refer to tests in the comments, in addition to the current comment explanations.

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@trask trask Feb 21, 2025

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I'd prefer to just improve the comments if they are unclear. Or if you make specific suggestions linking these to tests I'm happy to hit accept.

@trask trask merged commit aa2d6f3 into main Feb 24, 2025
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@trask trask deleted the sampling-override-behavior branch February 24, 2025 18:03
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@jeanbisutti jeanbisutti jeanbisutti approved these changes

@heyams heyams Awaiting requested review from heyams

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

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

@rajkumar-rangaraj rajkumar-rangaraj Awaiting requested review from rajkumar-rangaraj rajkumar-rangaraj is a code owner

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