Resolved
GitHub's webhook problems have now resolved; our integration should now be functioning normally. If you notice any continuing issues, please let us know at support@linear.app.
Investigating
GitHub is investigating issues with webhooks. For users of the GitHub integration in Linear, this will likely appear as problems both initiating the connection between issues and PRs/commits, and issues with the integration updating associated issue statuses. More information is available on githubstatus.com.