[metrics-bugs] #31071 [Metrics/ExoneraTor]: Add a notice if we're missing data for a lookup

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#31071: Add a notice if we're missing data for a lookup
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 Reporter:  karsten             |          Owner:  karsten
     Type:  enhancement         |         Status:  needs_review
 Priority:  Medium              |      Milestone:
Component:  Metrics/ExoneraTor  |        Version:
 Severity:  Normal              |     Resolution:
 Keywords:                      |  Actual Points:
Parent ID:                      |         Points:
 Reviewer:  irl                 |        Sponsor:
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Comment (by irl):

 How do we plan to detect incomplete data? Perhaps the simplest option is
 to have a table that keeps track of events, and return those events along
 with the result instead of making the query more complex. i.e. do two SQL
 queries, one for the data and a second one for any events that might give
 context.

 When the importer fails to find a new exit list, it can just add an entry
 to the events table. If there are not enough addresses in it, or no
 address was recently checked, it could do the same.

 Understanding how often this has happened would be a good start, maybe we
 don't need to have the importer do this if it's not happening that often,
 we can just detect it and manually add rows to the table.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/31071#comment:3>
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