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runtime,runtime/metrics: add heap goal and GC cycle metrics

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This change adds three new metrics: the heap goal, GC cycle count, and
forced GC count. These metrics are identical to their MemStats
counterparts.

For #37112.

Change-Id: I5a5e8dd550c0d646e5dcdbdf38274895e27cdd88
Reviewed-on: https://go-review.googlesource.com/c/go/+/247044
Run-TryBot: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
This commit is contained in:
Michael Anthony Knyszek 2020-08-06 16:47:58 +00:00 • committed by Michael Knyszek
parent 07c3f65d53
commit a8b28ebc87
4 changed files with 86 additions and 8 deletions
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12
src/runtime/metrics/doc.go
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@ -44,6 +44,18 @@ the documentation of the Name field of the Description struct.
Supported metrics
/gc/cycles/automatic:gc-cycles
Count of completed GC cycles generated by the Go runtime.
/gc/cycles/forced:gc-cycles
Count of completed forced GC cycles.
/gc/cycles/total:gc-cycles
Count of all completed GC cycles.
/gc/heap/goal:bytes
Heap size target for the end of the GC cycle.
/gc/heap/objects:objects
Number of objects, live or unswept, occupying heap memory.