Add some logging around sync for stuck message debugging #1300
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For matrix-org/synapse#7206
Reviewer: if this looks okay, please merge it so the backend team can test with it ASAP.
Intended to be removed (or possibly converted into a proper off-by-default setting) once the issue concludes.
There's a bunch of null checking through defaults here because this is a very critical part of the whole stack. We default to writing errors to the console, but do not break the app for failing to log info about the sync.
To enable, run
localStorage.setItem("mx_do_sync_logging", "true");
in the JS console