tree 17fc5d67c1e7ec1272bc5486cd2553dc63b442d0
parent 67a24dd5f9f8dce1095f44cae20431eaf6c6eeea
author Jonathan Amsterdam <jba@google.com> 1623334247 -0400
committer Jonathan Amsterdam <jba@google.com> 1623433417 +0000

event: semi-automatic trace duration metric

If the call to Builder.End includes a DurationMetric label, then emit
a Metric measuring the time between the parent Start call and the End.

Also, fix a bug in Builder.Start where the synthesized End event
didn't have the same labels as the Start event.

Change-Id: If5e0598e69628e6300b8590a0c607426237aa2b7
Reviewed-on: https://go-review.googlesource.com/c/exp/+/326673
Trust: Jonathan Amsterdam <jba@google.com>
Run-TryBot: Jonathan Amsterdam <jba@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Ian Cottrell <iancottrell@google.com>