[tor-bugs] #20380 [Metrics/CollecTor]: Expand INSTALL.md to a more complete operator's guide

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#20380: Expand INSTALL.md to a more complete operator's guide
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 Reporter:  karsten            |          Owner:
     Type:  enhancement        |         Status:  needs_review
 Priority:  Medium             |      Milestone:  CollecTor 1.1.0
Component:  Metrics/CollecTor  |        Version:
 Severity:  Normal             |     Resolution:
 Keywords:                     |  Actual Points:
Parent ID:                     |         Points:
 Reviewer:                     |        Sponsor:
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Comment (by iwakeh):

 Looks fine!  The executable jar runs, INSTALL.md and changelog are fine,
 all tests (incl. the usually ignored) pass.

 I'll prepare the announcement and make the changes to the relevant wiki
 pages.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20380#comment:24>
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