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* Add metrics to track how often events are `soft_failed` (#10156)Eric Eastwood2021-06-111-0/+1
Spawned from missing messages we were seeing on `matrix.org` from a federated Gtiter bridged room, https://gitlab.com/gitterHQ/webapp/-/issues/2770. The underlying issue in Synapse is tracked by https://github.com/matrix-org/synapse/issues/10066 where the message and join event race and the message is `soft_failed` before the `join` event reaches the remote federated server. Less soft_failed events = better and usually this should only trigger for events where people are doing bad things and trying to fuzz and fake everything.