[metrics-bugs] #28322 [Metrics]: Deploy better notification system for operational issues

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#28322: Deploy better notification system for operational issues
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     Reporter:  karsten  |      Owner:  metrics-team
         Type:  task     |     Status:  new
     Priority:  Medium   |  Milestone:
    Component:  Metrics  |    Version:
     Severity:  Normal   |   Keywords:
Actual Points:           |  Parent ID:
       Points:           |   Reviewer:
      Sponsor:           |
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 We have been using Nagios to monitor Onionoo for a few years now, and we
 recently extended (#28242) or added new Nagios checks (#28271).

 We should consider adding even more checks. One year ago we
 [https://lists.torproject.org/pipermail/metrics-
 team/2017-November/000523.html discussed what checks that could be], and
 it seems like this list could still serve as starting point for adding new
 checks now.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/28322>
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