Grain change history: Zoom join failures

Grain reported a critical outage starting 2023-12-19 15:33 UTC: Zoom blocked Grain Recorder from joining approximately 75% of calls. A temporary mitigation appeared successful; Grain later worked with Zoom to deploy a proper fix, reporting no further issues. The incident was resolved 2024-01-19 17:40 UTC, with a recorded duration of 31 days 2 h.