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Invalid /metrics output after adding new pipeline
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Description

The Prometheus exporter for ArcLamp broke when we added the excimer-buster pipeline. It contains lines with missing values, such as the following:

arclamp_newest_svg_seconds{period="hourly",profiler="excimer-buster",entry="all"}

I think this will fix itself once the graphs start being created; this task is to fix the underlying bug.

Event Timeline

Change 664601 had a related patch set uploaded (by Dave Pifke; owner: Dave Pifke):
[performance/arc-lamp@master] Fix metrics generation

https://gerrit.wikimedia.org/r/664601

Change 664601 merged by jenkins-bot:
[performance/arc-lamp@master] Fix metrics generation

https://gerrit.wikimedia.org/r/664601

Mentioned in SAL (#wikimedia-operations) [2021-02-22T16:26:28Z] <dpifke@deploy1001> Started deploy [performance/arc-lamp@1f3bce1]: Deploy ArcLamp fixes for T273565 and T273640

Mentioned in SAL (#wikimedia-operations) [2021-02-22T16:26:35Z] <dpifke@deploy1001> Finished deploy [performance/arc-lamp@1f3bce1]: Deploy ArcLamp fixes for T273565 and T273640 (duration: 00m 05s)