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Add metrics to track how often events are soft_failed
(#10156)
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.
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Add `synapse_federation_soft_failed_events_total` metric to track how often events are soft failed.
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@ -33,6 +33,7 @@ from typing import (
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)
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import attr
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from prometheus_client import Counter
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from signedjson.key import decode_verify_key_bytes
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from signedjson.sign import verify_signed_json
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from unpaddedbase64 import decode_base64
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@ -101,6 +102,11 @@ if TYPE_CHECKING:
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logger = logging.getLogger(__name__)
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soft_failed_event_counter = Counter(
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"synapse_federation_soft_failed_events_total",
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"Events received over federation that we marked as soft_failed",
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)
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@attr.s(slots=True)
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class _NewEventInfo:
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@ -2498,6 +2504,7 @@ class FederationHandler(BaseHandler):
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event_auth.check(room_version_obj, event, auth_events=current_auth_events)
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except AuthError as e:
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logger.warning("Soft-failing %r because %s", event, e)
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soft_failed_event_counter.inc()
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event.internal_metadata.soft_failed = True
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async def on_get_missing_events(
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