Some Actions customers experiencing run start delays
This summary is created by Generative AI and may differ from the actual content.
Overview
Some GitHub Actions customers experienced run start delays between 08:50 UTC and 11:00 UTC on December 10, 2025, with approximately 8% of workflow runs affected, all of which successfully completed despite the delays.
Impact
Approximately 8% of workflow runs were affected, with longer-than-normal wait times for jobs starting or completing, but all jobs successfully completed.
Trigger
A spike in workflow events led to queuing of event processing, causing delays in starting or showing as completed for runs being processed by impacted nodes.
Detection
The team was alerted to this at 8:58 UTC.
Resolution
Impacted nodes were disabled from processing new jobs to allow queues to drain, and a mitigation was applied to fix the issues with queuing and running Actions jobs. Additionally, overall processing capacity was increased, and safeguards are being implemented to better balance load across all nodes when spikes occur.
Root Cause
The root cause of the incident was the queuing of event processing due to a spike in workflow events, which led to delays in starting or showing as completed for runs being processed by impacted nodes.