[tor-bugs] #31780 [Circumvention/BridgeDB]: Write a specification for BridgeDB's metrics

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#31780: Write a specification for BridgeDB's metrics
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 Reporter:  phw                     |          Owner:  phw
     Type:  task                    |         Status:  merge_ready
 Priority:  Medium                  |      Milestone:
Component:  Circumvention/BridgeDB  |        Version:
 Severity:  Normal                  |     Resolution:
 Keywords:                          |  Actual Points:
Parent ID:                          |         Points:  0.5
 Reviewer:  cohosh                  |        Sponsor:  Sponsor30-can
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Comment (by phw):

 Replying to [comment:8 phw]:
 > Replying to [comment:7 karsten]:
 > > Just one question: can we somehow make these changes to existing
 `bridgedb-metrics.log*` files, either on polyanthum or on colchicifolium?
 It would be sad to lose a month of files just because of cosmetic changes
 to the spec. If so, do you prefer editing files yourself, or shall I do
 that?
 > [[br]]
 > I will modify all the files that are currently on polyanthum but you'll
 have to modify the ones that were already synced to colchicifolium.
 [[br]]
 Ok, this is done. The updated files should soon be synced to
 colchicifolium.

 Here's an implementation quirk that I just realised: When I restart
 BridgeDB (e.g., to update to the latest version), it does not write its
 unfinished metrics to disk, which means that we are losing  up to 24 hours
 worth of metrics after each restart. I filed #31936 for this issue.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/31780#comment:9>
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