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runtime/metrics: /gc/scan* metrics return zero #62477

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mknyszek opened this issue Sep 6, 2023 · 4 comments
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runtime/metrics: /gc/scan* metrics return zero #62477

mknyszek opened this issue Sep 6, 2023 · 4 comments
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compiler/runtime Issues related to the Go compiler and/or runtime. NeedsFix The path to resolution is known, but the work has not been done.
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mknyszek commented Sep 6, 2023 •
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These new metrics, introduced in Go 1.21, always return zero due to an oversight (no dependency declared in the metrics definition). https://go.dev/cl/525595 fixes this.
@mknyszek mknyszek added NeedsFix The path to resolution is known, but the work has not been done. compiler/runtime Issues related to the Go compiler and/or runtime. labels Sep 6, 2023
@mknyszek mknyszek added this to the Backlog milestone Sep 6, 2023
@mknyszek mknyszek self-assigned this Sep 6, 2023
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mknyszek commented Sep 6, 2023

@gopherbot please open a backport issue for Go 1.21.

This issue means that some new metrics just don't work, and there's no workaround. Although the severity of the issue is quite low, the fix is also very safe and includes a test.

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Backport issue(s) opened: #62478 (for 1.21).

Remember to create the cherry-pick CL(s) as soon as the patch is submitted to master, according to https://go.dev/wiki/MinorReleases.

@gopherbot gopherbot mentioned this issue Sep 6, 2023
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Change https://go.dev/cl/525595 mentions this issue: runtime/metrics: fix /gc/scan/* metrics

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Change https://go.dev/cl/526116 mentions this issue: [release-branch.go1.21] runtime/metrics: fix /gc/scan/* metrics

gopherbot pushed a commit that referenced this issue Sep 11, 2023
@Gandem @gopherbot
[release-branch.go1.21] runtime/metrics: fix /gc/scan/* metrics
cd66ca0 
In the existing implementation, all /gc/scan/* metrics are
always equal to 0 due to the dependency on gcStatDep not being
set. This leads to gcStatAggregate always containing zeros, and
always reporting 0 for those metrics.

Also, add a test to ensure that /gc/scan/* metrics are not empty.

For #62477.
Fixes #62478.

Change-Id: I67497347d50ed5c3ce1719a18714c062ec938cab
Reviewed-on: https://go-review.googlesource.com/c/go/+/526116
Reviewed-by: Michael Pratt <mpratt@google.com>
Auto-Submit: Heschi Kreinick <heschi@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
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