Partial degradation for code scanning default setup and for code quality
Resolved
Major impact
Updates
Resolved
On April 20, 2026 between 10:28 UTC and 15:04 UTC GitHub experienced degraded service for code scanning default setup, code quality, and project boards. Repair of affected project boards additionally lasted until April 21, 05:04 UTC <br /><br />During this time, code scanning default setup and code quality analyses were not triggered on newly opened pull requests. Additionally, newly created issues were not appearing on project boards. <br /><br />The cause was a serialization error that prevented proper triggering of code scanning, code quality analyses, and project board updates. <br /><br />We mitigated the issue by deploying a fix, restoring event publishing for code scanning and code quality. For project boards, an additional code change was deployed to update event consumers, followed by a reindex of affected project items. <br /><br />We are working to prevent recurrence by strengthening our schema validations and improving monitoring for drops in publishing on critical hydro topics.
Monitoring
The degradation has been mitigated. We are monitoring to ensure stability.
Monitoring
The issue remains mitigated. Issues that were linked to projects during the incident may take approximately three more hours to render correctly while we complete a re-index.
Monitoring
The degradation has been mitigated. We are monitoring to ensure stability.
Monitoring
The degradation has been mitigated. We are monitoring to ensure stability.
Monitoring
The degradation has been mitigated. We are monitoring to ensure stability.
Investigating
The issue has been mitigated. Newly created issues linked to projects should now function as expected. Issues that were linked to projects during the incident may take approximately five hours to render correctly while we complete a re-index.
Investigating
A deployment to fix this issue of new issues not showing up in projects is underway.
Investigating
We continue to work on mitigation regarding new issues not showing on project boards.
Investigating
We continue to work on mitigation regarding new issues not showing on project boards.
Investigating
Code scanning default setup and Code Quality triggers are back up and running. PRs not processed before or during this incident will require a new push to trigger code scanning or code quality analysis.<br /><br />We are seeing problems with new issues not showing on project boards and are working on mitigation.
Investigating
We are continuing to work on a mitigation to unblock code scanning default setup and code quality features on pull requests.
Investigating
We are currently deploying mitigations that should unblock code scanning default setup and code quality features on pull requests.
Investigating
We are actively working to mitigate an issue affecting code scanning default setup and code quality features on pull requests. Users may experience pull request code scanning and code quality analyses not being triggered on new pull requests. Our engineering team has identified the root cause and working on mitigating the issue.
Investigating
We are investigating reports of impacted performance for some GitHub services.