metrics: record the number of times lint rules are triggered during a build #2484
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This metric records the number of times it sees a lint warning in the
progress stream and categorizes the number of times each rule has been
triggered. This will only record whether a lint warning was triggered
and not whether the linter was even used or which rules were present.
That information isn't presently part of the stream.
With this change, we might be reaching some of the limitations that
spying on the progress stream gives us for metrics and may want to
consider another way for the build to communicate metrics back to the
client.