"Job History" broken - data is multiple months stale

[howardjohn]

Example: https://prow.istio.io/job-history/gs/istio-prow/pr-logs/directory/integ-security-k8s-tests_istio last data is from May, but this job runs 100s of times a day and should have results for recent runs

[howardjohn]

This is still an issue

[ericvn]

Still an issue: see https://prow.istio.io/job-history/gs/istio-prow/pr-logs/directory/unit-tests_istio from https://prow.istio.io/view/gs/istio-prow/pr-logs/pull/istio_istio/36786/unit-tests_istio/1480908993751683072.