[tor-bugs] #28841 [Core Tor/Tor]: Write tool for onion service health assesment

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#28841: Write tool for onion service health assesment
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     Reporter:  asn           |      Owner:  (none)
         Type:  defect        |     Status:  new
     Priority:  Medium        |  Milestone:  Tor: unspecified
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:  tor-hs reachability research
Actual Points:                |  Parent ID:
       Points:                |   Reviewer:
      Sponsor:                |
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 We've been getting lots of reports about bad reachability of onion
 services (e.g. #28730) and in particular the v3 ones.

 We need a tool that we can use to evaluate and monitor the health of onion
 services. We should use it to verify how reachable and stable onions are,
 and also as a benchmark for how their stability changes over time.

 A relevant ticket here is #13209 which we can leverage in the future.

 One way to write such a tool is to provide it with an onion service, and
 the tool fetches its desc from every HSDir, then introduces itself to all
 the intro points, and make sure that rendezvous can occur. Then it
 monitors this over time to find issues with reachability.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/28841>
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