Slack outage on December 18, 2025
Slack users likely saw failed connections, degraded availability, or session instability for this Productivity service. The incident reached Minor severity and lasted 45 min. The stored report window does not show a preserved user-report spike.
From 7:12 AM to 4:50 PM PST on December 8, 2025, some users encountered a "Something's fishy!" error when loading threads or experienced delays or a blank screen when loading specific channels in Slack.We identified the cause as a recent configuration change that triggered unexpected rate limiting on backend components responsible for fetching message data for threads. We reverted the problematic change, resolving the issue for all users.
Deterministic readout · awaiting AI summary pass
Incident detected
Minor confidence crossed the incident threshold for Incident: Issues loading or viewing threads.
Marked resolved
The incident was closed after 45 min of observed impact.
No per-source signal payloads were preserved in this incident's snapshot window.
Confidence scoring
25.00The incident reached 25.00 peak confidence across available stored status snapshots.
User reports
0 / 15mNo elevated user-report volume was preserved in the incident window snapshots.
Status samples
0 affectedThe incident row exists, but the bounded snapshot window does not include affected status samples.
Recovery signal
ResolvedRecovery was recorded at Thu, Dec 18, 2025, 05:29 PM UTC.