Merging task outcome metric and other minutia to chrome #4491
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### Motivation We currently have no metric that tracks the error rate for each task. This PR implements that, and the error rate can be obtained by summing up the metric with outcome=failure, divided by the overall sum. This is useful for SLI alerting. Part of #4271
### Motivation #4364and #4381 have introduced metrics for how long it took between a testcase creation and some event of interest (cleanup considering to close a bug, analyze finishing, et al). These percentile metrics allowed us to notice that there are several testcases that did not make progress for more than a year. This PR introduces logging so we can pinpoint them, and discuss if a purge of some sort is required
vitorguidi
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Motivation
This merges #4489, #4458 and #4483 to the chrome temporary deployment branch
The purpose is to have task error rate metrics, and log what old testcases are polluting the testcase upload metrics, so we can figure out if a purge is necessary