runtime/metrics: remove unused StopTheWorld Description field

This change removes the as-of-yet unused StopTheWorld field in the
Description struct. Adding a new field to a struct is much easier than
removing it, so let's save it for when we actually need it.

Change-Id: I8074b8569187c1a148500575fa8a661534e875d5
Reviewed-on: https://go-review.googlesource.com/c/go/+/282632
Run-TryBot: Michael Knyszek <[email protected]>
TryBot-Result: Go Bot <[email protected]>
Trust: Michael Knyszek <[email protected]>
Reviewed-by: Michael Pratt <[email protected]>
Reviewed-by: Austin Clements <[email protected]>

Author: mknyszek

api/go1.16.txt

@@ -395,7 +395,6 @@ pkg runtime/metrics, type Description struct, Cumulative bool
 pkg runtime/metrics, type Description struct, Description string
 pkg runtime/metrics, type Description struct, Kind ValueKind
 pkg runtime/metrics, type Description struct, Name string
-pkg runtime/metrics, type Description struct, StopTheWorld bool
 pkg runtime/metrics, type Float64Histogram struct
 pkg runtime/metrics, type Float64Histogram struct, Buckets []float64
 pkg runtime/metrics, type Float64Histogram struct, Counts []uint64

src/runtime/metrics/description.go

@@ -46,10 +46,6 @@ type Description struct {
 	//
 	// This flag thus indicates whether or not it's useful to compute a rate from this value.
 	Cumulative bool
-
-	// StopTheWorld is whether or not the metric requires a stop-the-world
-	// event in order to collect it.
-	StopTheWorld bool
 }
 
 // The English language descriptions below must be kept in sync with the