test:
[sig-instrumentation][sig-builds][Feature:Builds] Prometheus when installed on the cluster should start and expose a secured proxy and verify build metrics 

is failing frequently in CI, see search results:
https://search.ci.openshift.org/?maxAge=168h&context=1&type=bug%2Bjunit&name=&maxMatches=5&maxBytes=20971520&groupBy=job&search=%5C%5Bsig-instrumentation%5C%5D%5C%5Bsig-builds%5C%5D%5C%5BFeature%3ABuilds%5C%5D+Prometheus+when+installed+on+the+cluster+should+start+and+expose+a+secured+proxy+and+verify+build+metrics


https://prow.ci.openshift.org/job-history/origin-ci-test/pr-logs/directory/pull-ci-openshift-cluster-network-operator-release-4.5-e2e-ovn-hybrid-step-registry


`fail [github.com/openshift/origin/test/extended/util/prometheus/helpers.go:174]: Expected
    <map[string]error | len:1>: {
        "openshift_build_total{phase=\"Complete\"} >= 0": {
            s: "promQL query: openshift_build_total{phase=\"Complete\"} >= 0 had reported incorrect results:\n[]",
        },
    }
to be empty`

I'm Seeing Prometheus errors across 4.5 CI, https://sippy.ci.openshift.org/?release=4.5#TopFailingTestsWithoutABug, all down from high passing rates in prior weeks