[metrics-bugs] #22122 [Metrics/metrics-lib]: Add support for six new key-value pairs added by OnionPerf

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#22122: Add support for six new key-value pairs added by OnionPerf
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 Reporter:  karsten              |          Owner:  metrics-team
     Type:  enhancement          |         Status:  needs_review
 Priority:  Medium               |      Milestone:  metrics-lib 1.7.0
Component:  Metrics/metrics-lib  |        Version:
 Severity:  Normal               |     Resolution:
 Keywords:                       |  Actual Points:
Parent ID:                       |         Points:
 Reviewer:                       |        Sponsor:
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Comment (by karsten):

 Thanks, Rob, for the quick feedback!  I included as many of those details
 as possible while trying to leave out implementation specifics.  (I also
 considered my note to self above by reformatting JavaDocs and including
 `@since` tags.)  Now waiting for a review of the Java parts before this
 can go in.  Thanks again!

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/22122#comment:3>
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