[tor-bugs] #28271 [Metrics/Onionperf]: Check OnionPerf instances from Nagios

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#28271: Check OnionPerf instances from Nagios
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     Reporter:  irl                |      Owner:  hiro
         Type:  task               |     Status:  new
     Priority:  Medium             |  Milestone:
    Component:  Metrics/Onionperf  |    Version:
     Severity:  Normal             |   Keywords:
Actual Points:                     |  Parent ID:
       Points:                     |   Reviewer:
      Sponsor:                     |
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 There are a few things that we can check, some are easier than others.

 * Is the host up and the webserver running? (this is easy with built-in
 checks)
 * Is the tgen server running on the Internet? (this is easy with built-in
 checks)
 * Is the analyze task running? (needs a plugin)
 * Is the tgen server running on an Onion service? (needs a plugin)

 For monitoring the Onion service, I'm looking at reusable plugins, so
 there are two tests. One checks to see how old the descriptor is and a
 second test actually tries connecting to the service. The first of these
 tests is affected by #28269 (but not blocked) and both are blocked by
 [[https://github.com/robgjansen/onionperf/issues/42|onionperf#42]].

 As a workaround for monitoring the Onion service, which really is the bit
 that is breaking, we can instead monitor the analysis of timeouts from Tor
 Metrics' CSV files.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/28271>
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