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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.