These tests are always timing out in our Jenkins CI environment. We have moved our timeout to 2 minutes. I have added a check for the short flag so other can skip these tests as we are until this can be identified.
We are running into a timeout with TestHistogramConcurrency on our Jenkins box. I noticed in the stack trace for the timeout this block.
goroutine 2348 [chan send]:
github.comcast.com/ventris/kober/vnd/github.com/prometheus/client_golang/prometheus.(*goCollector).Collect(0xc20801e8e0, 0xc20800a7e0)
/var/lib/jenkins/jobs/Kober/workspace/src/github.comcast.com/ventris/kober/vnd/github.com/prometheus/client_golang/prometheus/go_collector.go:49 +0x6dd
github.comcast.com/ventris/kober/vnd/github.com/prometheus/client_golang/prometheus.func·028()
/var/lib/jenkins/jobs/Kober/workspace/src/github.comcast.com/ventris/kober/vnd/github.com/prometheus/client_golang/prometheus/go_collector_test.go:27 +0x11a
created by github.comcast.com/ventris/kober/vnd/github.com/prometheus/client_golang/prometheus.TestGoCollector
/var/lib/jenkins/jobs/Kober/workspace/src/github.comcast.com/ventris/kober/vnd/github.com/prometheus/client_golang/prometheus/go_collector_test.go:28 +0x35e
This suggested that even though the TestGoCollector test was finished, a goroutine was still hanging around. I traced it back to the call to c.Collect always sending twice of the provided channel. This change receives that second value and allows the goroutine to finish with the test.
Still can't figure out why TestHistogramConcurrency is timing out after 2 minutes :(
Using tabs to align things has the downside that people who have set the
tabstop to be of a different lenght than the orignial author's run the
risk of not having the alignment stay. In the current Makefile before
this change people with tabstop of 4 do not see the equals line up.
The prometheus link in the README is broken - there is no page at www.prometheus.io (it's at promethius.io - I guess they didn't set up a redirect). @beorn7
Björn Rabenstein