Scheduled Grid Migrations are experiencing extended downtime
Final update
This issue is now resolved. Current status and actions being taken: We identified database write throttling as the cause of the stalled grid migrations. We applied a drop rule for jobs that were stuck in a retry loop, which has restored normal migration processing. Scope: A small number of enterprise users undergoing grid migrations experienced extended delays in accessing Slack. Current impact to end users: Affected users may have experienced an inability to access Slack during their migration window. Known workarounds: No workarounds needed at this time. We apologize for how this incident affected you and your business.
Timeline
- Resolved · May 8, 17:44 UTC
This issue is now resolved. Current status and actions being taken: We identified database write throttling as the cause of the stalled grid migrations. We applied a drop rule for jobs that were stuck in a retry loop, which has restored normal migration processing. Scope: A small number of enterprise users undergoing grid migrations experienced extended delays in accessing Slack. Current impact to end users: Affected users may have experienced an inability to access Slack during their migration window. Known workarounds: No workarounds needed at this time. We apologize for how this incident affected you and your business.
- Update · May 8, 12:13 UTC
Users who are undergoing scheduled Grid Migrations are experiencing extended downtime. Downtime is expected during a Grid Migration however it's taking longer than usual. During the downtime users are unable to access Slack until the migration completes. We've identified an issue with Job Queues, which may be the cause and are investigating this further. The next update will be provided once additional information becomes available.
More from Slack
Full history| Started | Incident | Impact | Duration |
|---|---|---|---|
| Sep 1211:04 UTC | Some customers experiencing blurry image previews and download issues | minor | 8h 56m |
| Sep 1000:34 UTC | Trouble loading Workspace-level Apps & Workflows settings page is returning blank pages | minor | 2h 40m |
| Aug 1321:21 UTC | Trouble Accessing Historical Messages With Custom Data Retention Policies Enabled | minor | 32d 1h |
| Aug 622:22 UTC | Trouble Using Search Bar For Some Admins | minor | 2h 44m |
| Jul 2802:13 UTC | Feature Degradation Affecting the Receipt of Emails in Slack | minor | 1h 30m |
| Jul 2408:22 UTC | Issue sending messages to channels via certain Workflows | minor | 2h 24m |
Also caused by capacity and load
All| Started | Vendor | Incident | Impact | Duration |
|---|---|---|---|---|
| Sep 2213:19 UTC |  ClickHouse | We are investigating an issue with CH servers in Azure germanywestcentral regionClickHouse | minor | 5h 6m |
| Sep 1607:20 UTC |  GitHub | Degradation with Gemini 3.8 FlashGitHub | major | 10h 28m |
| Sep 1509:47 UTC | GitHub | Disruption with some GitHub servicesGitHub | minor | 1h 30m |
| Sep 422:02 UTC | GitHub | Degradation in repos contents APIGitHub | minor | 21m |
| Sep 221:44 UTC |  Expo | Elevated Linux worker queue timesExpo | minor | 21m |
| Sep 115:00 UTC | GitHub | Delays in commit processingGitHub | minor | 1h 1m |
Sources: vendors' own status pages, published postmortems and SEC 8-K Item 1.05 filings, read daily. Times as reported. Logos via logo.dev; trademarks belong to their owners.