MongoDB experienced a major incident on November 5, 2025 affecting MongoDB Cloud, lasting 5h 57m. The incident has been resolved; the full update timeline is below.
Affected components
Update timeline
- investigating Nov 05, 2025, 06:57 PM UTC
We are observing widespread issues in a single AZ in Azure West Europe. Customers may see nodes reporting as "down" and delayed cluster modifications for Azure clusters in West Europe. There are three total AZs in Azure West Europe, and primary failover will be handled by MongoDB.
- identified Nov 05, 2025, 07:08 PM UTC
Azure has posted to their Service Health dashboard indicating Virtual Machines in the West Europe region may experience service disruptions or degraded performance due to a thermal event impacting data center cooling systems in the region. Please refer to the Azure Service Health dashboard for their service issue updates.
- identified Nov 05, 2025, 08:13 PM UTC
Azure has posted the following to their public Status Page: https://azure.status.microsoft/en-us/status Thermal event in West Europe region Impact Statement: Starting at approximately 17:00 UTC on 05 November 2025, a subset of customers using Virtual Machine, Azure Databricks, Azure Database for PostgreSQL flexible servers, MySQL flexible servers, Azure Kubernetes Service, Storage, Service Bus and Virtual Machine Scale Sets, among other affected services in the West Europe region may experience service disruptions or degraded performance due to a subset of storage scale units going offline due to a thermal event impacting data center cooling systems in a single availability zone. Resources in other availability zones reliant on these storage scale units may be impacted. Current Status: We detected this issue via our automated service monitoring, which identified a spike in hardware temperatures and service incidents affecting multiple storage scale units. Cooling has been restored, and teams are working to recover the impacted storage scale units. The next update will be provided within 60 minutes, or as events warrant. This message was last updated at 20:07 UTC on 05 November 2025
- monitoring Nov 05, 2025, 08:47 PM UTC
We are seeing nodes in the impacted Azure West Europe Availability Zone coming online. We expect full zone recovery to take a few more hours, and will continue to monitor and provide updates.
- monitoring Nov 05, 2025, 09:31 PM UTC
Azure updated their public status post at 21:13 UTC on 05 November 2025 to indicate they anticipate seeing signs of recovery for their services in approximately 3 hours. We will continue to monitor and provide updates.
- monitoring Nov 05, 2025, 11:53 PM UTC
Many nodes have recovered in the impacted Availability Zone, however there are still some impacted nodes that are recovering. Azure's latest update at 22:49 UTC on 05 November 2025 indicated recovery efforts remain in progress and they anticipate seeing signs of recovery in approximately on these storage scale units in approximately 90 minutes. We will continue to monitor and provide updates.
- resolved Nov 06, 2025, 12:54 AM UTC
We are resolving the status post as we expect our system to remediate any lingering issues. Please follow the Azure status post for further updates on the availability zone remediation efforts from their end.