synapse-product/changelog.d/11760.misc
David Robertson f160fe18e3
Debug for device lists updates (#11760)
Debug for #8631.

I'm having a hard time tracking down what's going wrong in that issue.
In the reported example, I could see server A sending federation traffic
to server B and all was well. Yet B reports out-of-sync device updates
from A.

I couldn't see what was _in_ the events being sent from A to B. So I
have added some crude logging to track

- when we have updates to send to a remote HS
- the edus we actually accumulate to send
- when a federation transaction includes a device list update edu
- when such an EDU is received

This is a bit of a sledgehammer.
2022-01-20 13:38:44 +00:00

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Add optional debugging to investigate [issue 8631](https://github.com/matrix-org/synapse/issues/8631).