This circumvents the following problem:
• The prometheus client library appends “/metrics/…” to the pushURL.
• When pushURL ends in a trailing slash, the URL becomes e.g.
http://pushgateway.example.com:9091//metrics/…
• The pushgateway will reply with an HTTP 307 status code
(temporary redirect).
• While Go’s net/http client follows redirects by default, it will only
follow HTTP 302 (Found) and HTTP 303 (See Other) redirects for PUT and
POST requests, which the prometheus client library uses.
Hence, when calling e.g.:
prometheus.Push("foo", "bar", "http://pushgateway.example.com:9091/")
…your metrics would not actually get pushed successfully, but rather
you’d see the error message:
2015/11/26 10:59:49 main.go:209: unexpected status code 307 while pushing to http://push...
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 :(
Harmen