The service encountered an outage in the ingestion path which retained the access logs at the messaging-level.
While being identified by the monitoring, this error unfortunately triggered as low-priority, hence being silent during a part of the week-end which led to a drop of access logs after a retention period.
We have found the root issue and the problem is now resolved and should prevent further similar incident.
Besides, we've fixed the level of criticity in our monitoring infrastructure.
26/09/2022 12:00 UTC: End of incident