MongoDB Atlas change history: Cluster connectivity issues in Azure westus

MongoDB Atlas reported a major outage affecting some Azure westus clusters: intermittent connection failures, inter-node communication issues, nodes appearing down, and delayed cluster modifications. It started 2026-07-23 16:21 UTC and resolved 2026-07-23 20:28 UTC (4 h 6 min); Azure confirmed networking issues, and recovery completed after Azure rolled out mitigation.