[tor-bugs] #13362 [Onionoo]: Make Onionoo's logs more useful

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#13362: Make Onionoo's logs more useful
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     Reporter:  karsten      |      Owner:
         Type:  enhancement  |     Status:  needs_revision
     Priority:  normal       |  Milestone:
    Component:  Onionoo      |    Version:
   Resolution:               |   Keywords:
Actual Points:               |  Parent ID:
       Points:               |
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Comment (by karsten):

 Agreed, let's define what we'd like to log and how, and let's document
 that both for code contributors and for service operators.  Some
 suggestions:
  - I'd like to keep a detailed log for debugging problems.  We could use
 two log levels for normal operation: debug and info.
  - There should also be logs for warnings and errors.  We might even
 suggest setting up Nagios scripts that check whether either of these log
 files is not empty and issue a warning message to the operator.  During
 normal operation, there shouldn't be any warnings or even errors, so we
 should only use those two log levels when the operator must take a look.
 Once the operator resolves the problem they should delete the log file;
 warnings and error messages will still be contained in detailed logs.
 We'll probably want two sets of warning/error logs for back-end and front-
 end.
  - We don't really need a separate statistics log file.  What we might
 want to do instead is define thresholds for certain operations, like
 reading descriptors of a certain time, and emit a warning if that
 operation takes longer than that.  We could use the same log files as
 described above.

 I didn't merge my task-13362 branch to master yet.  Please let me know
 which changes require more discussion, and I'll split up the commit and
 merge the undisputed parts.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/13362#comment:5>
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