We don't use this mechanism any more, so the metric will always be zero.
Since CL 616255.
Update #73628
Change-Id: Ic179927a8bc24e6291876c218d88e8848b057c2a
Reviewed-on: https://go-review.googlesource.com/c/go/+/671096 Reviewed-by: Keith Randall <khr@google.com> Reviewed-by: Michael Knyszek <mknyszek@google.com>
Auto-Submit: Keith Randall <khr@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>