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runtime/metrics: docs reference nonexistent names and removed features #44280

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zephyrtronium opened this issue Feb 16, 2021 · 2 comments
Closed

runtime/metrics: docs reference nonexistent names and removed features #44280

zephyrtronium opened this issue Feb 16, 2021 · 2 comments
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Documentation FrozenDueToAge NeedsFix The path to resolution is known, but the work has not been done.
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Go1.16

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@zephyrtronium
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The docs on Sample specify that the Name field must be set to a description returned by Descriptions. I believe this should refer to All instead, because there is no identifier named Descriptions in package metrics.

go/src/runtime/metrics/sample.go

Lines 13 to 18 in 0cb3415

type Sample struct {
// Name is the name of the metric sampled.
//
// It must correspond to a name in one of the metric descriptions
// returned by Descriptions.
Name string

Additionally, the package-level documentation mentions that Description values describe "how difficult or disruptive it is to obtain," but this information appears to have been removed in 8f6a9ac to save for the future. The only information of the style the documentation describes is whether a metric is cumulative.

go/src/runtime/metrics/doc.go

Lines 16 to 21 in 0cb3415

Metrics are designated by a string key, rather than, for example, a field name in
a struct. The full list of supported metrics is always available in the slice of
Descriptions returned by All. Each Description also includes useful information
about the metric, such as how to display it (for example, gauge vs. counter)
and how difficult or disruptive it is to obtain it (for example, do you need to
stop the world?).

@gopherbot
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Change https://golang.org/cl/292309 mentions this issue: runtime/metrics: update documentation to current interface

@dmitshur dmitshur added the NeedsFix The path to resolution is known, but the work has not been done. label Feb 16, 2021
@dmitshur dmitshur added this to the Go1.16 milestone Feb 16, 2021
@dmitshur
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CC @mknyszek.

@golang golang locked and limited conversation to collaborators Feb 16, 2022
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@zephyrtronium @dmitshur @gopherbot