[tor-bugs] #25132 [Core Tor]: Add uptime messages to control protocol GETINFO

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#25132: Add uptime messages to control protocol GETINFO
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     Reporter:             |      Owner:  (none)
  ageisp0lis               |
         Type:             |     Status:  new
  enhancement              |
     Priority:  Medium     |  Milestone:  Tor: unspecified
    Component:  Core Tor   |    Version:  Tor: unspecified
     Severity:  Normal     |   Keywords:  control protocol, GETINFO, uptime
Actual Points:             |  Parent ID:
       Points:             |   Reviewer:
      Sponsor:             |
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 I am helping to maintain a fleet of relays and intended to write a
 Prometheus exporter (that's a numerical time-series databases and
 monitoring system) in Python using stem in order to aggregate statistics
 from them, such as `traffic/read` and `traffic/written`, from which I can
 then build pretty graphs and metrics visualization/analytics. I discovered
 that there was no way to get the uptime in the control protocol. My first
 approach was to parse the heartbeat message in the logs via Logstash, but
 that's not good enough.

 This would very useful to have for sysadmins/SRE/DevOps to monitor their
 relays.

 I have done the implementation which adds two new commands: 'uptime'
 (seconds) and 'uptime_str' (in the heartbeat format). They're in separate
 commits.

 It's pushed up to this branch: https://github.com/ageis/tor/tree/control-
 getinfo-uptime

 I also have the accompanying update to torspec:
 https://github.com/ageis/torspec/tree/control-getinfo-uptime

 Please review and let me know what else I need to do in order to further
 this patch along. I actually couldn't find much information about your
 development/contribution processes.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/25132>
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