Outage report · Partial outage

Buildkite outage on Sep 9, 2026

Buildkite service disruption

SeverityPartial outage

StartedSep 9, 2026, 19:07UTC

ResolvedSep 10, 2026, 01:54UTC

Duration6h 47m

What happened

Buildkite reported a partial outage starting Sep 9, 2026, 19:07 UTC, affecting REST API, Web, Agent API, Job Queue. It was marked resolved at Sep 10, 2026, 01:54 UTC.

The incident lasted 6h 47m from first report to resolution.
Buildkite had reported 5 other partial or major outages in the 90 days before it.
9 other vendors we track reported a significant incident within 12 hours of it.

Latest update from Buildkite

## Service Impact _All times UTC unless stated otherwise._ Customers experienced elevated errors and latency across the Buildkite web interface, REST API, Agent API, and job queue during two periods: 18:43:00–19:21:00 and 20:02:00–20:28:00 on September 9, 2026. During these periods, customers encountered failed API requests, delayed job dispatch, and errors in agent operations including authentication, job acceptance, and artifact uploads. Some jobs impacted by the incident did not recover automatically. These jobs had to be manually cancelled and retried to complete successfully. Between 18:43:00–19:21:00: Agent API had an error rate up to 11.2% with no latency impact. REST API had a 9.7% error rate with no latency impact. Web request had a 2.6% error rate with no latency impact. Job queues were delayed by up to 3 minutes. Between 20:02:00–20:28:00: Agent API had an error rate up to 24.7% with no latency impact. REST API had a 4.9% error rate with no latency impact. Web requests

Read Buildkite's official incident report ↗