Github user steveloughran commented on the issue:
https://github.com/apache/spark/pull/9571
One other metric set I'm thinking of relates to a JIRA on app UIs not being
visible: making the time of last scan a metric, both as an epoch time and diff
from current time. That would let a management tool keep track of the scan
history, maybe even show alerts if things are out of date. At the very least,
if there are support calls, *and someone were to add the coda hale metrics
servlets* then users could point their browsers at the metrics page and get a
lump of JSON to paste into JIRAs
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