[tor-bugs] #30028 [Internal Services/Tor Sysadmin Team]: additional prometheus/grafana exporters/dashboards

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#30028: additional prometheus/grafana exporters/dashboards
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 Reporter:  anarcat                              |          Owner:  anarcat
     Type:  project                              |         Status:
                                                 |  assigned
 Priority:  Medium                               |      Milestone:
Component:  Internal Services/Tor Sysadmin Team  |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:                                       |  Actual Points:
Parent ID:  #29681                               |         Points:
 Reviewer:                                       |        Sponsor:
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Comment (by anarcat):

 i added the postfix exporter on all `mail_processing` nodes. it's not all
 postfix servers, because, well, postfix is installed *everywhere*. i
 figured i would keep this only to a subset.

 this was a little trickier than the apache exporter, because the postfix
 exporter is not available in stretch, so I had to do an unofficial
 backport, which i uploaded to db.torproject.org. i also took this
 opportunity to upload a NMU of the package in Debian as well, since it was
 out of date.

 i imported the dashboard from
 [https://github.com/kumina/postfix_exporter/issues/21 this issue] but it
 doesn't work out of the box, we'll probably have to write our own. i
 started working on one, but it's incomplete.

 next step is to finish those graphs and deploy exporters for bind and
 (maybe?) pgsql.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/30028#comment:3>
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