Trello outage on Nov 30, 2023

What happened

Trello reported a major outage starting Nov 30, 2023, 14:21 UTC, affecting Trello.com, API. It was marked resolved at Nov 30, 2023, 17:37 UTC.

• The incident lasted 3h 16m from first report to resolution.
• It was the longest significant outage Trello reported in the 12 months up to it.
• Trello had reported 2 other partial or major outages in the 90 days before it.

Latest update from Trello

### **SUMMARY** On Nov 30 2023, between 14:04 and 16:57 UTC, Atlassian customers using Trello experienced errors when accessing and interacting with the application. This incident impacted Trello users on the iOS and Android mobile apps as well as those using the Trello web app. The event was triggered by the release of a code change that eventually overloaded a critical part of the Trello database. The incident was detected immediately by our automated monitoring systems and was mitigated by disabling the relevant code change. The issue was extended by the failure of a secondary service whose recovery caused an increase in load on the same critical part of the Trello database, which created a negative feedback loop. This secondary service recovery involved reestablishing over a million connections, with each connection attempt adding load to the same part of the Trello database. We attempted to aid the service recovery by intentionally blocking some of the inbound Trello traffic to r

Read Trello's official incident report ↗

What our independent monitoring saw

Our independent monitoring of Trello started after this incident, so this report is based on Trello's status page.

Trello's overall reliability

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