Outage report · Partial outage

Slack outage on Aug 13, 2026

Incident: Trouble Accessing Historical Messages With Custom Data Retention Policies Enabled

SeverityPartial outage

StartedAug 13, 2026, 21:21UTC

ResolvedSep 14, 2026, 22:31UTC

Duration32d 1h

What happened

Slack reported a partial outage starting Aug 13, 2026, 21:21 UTC. It was marked resolved at Sep 14, 2026, 22:31 UTC.

The incident lasted 32d 1h from first report to resolution.
It was the longest significant outage Slack reported in the 12 months up to it.
Slack had reported 11 other partial or major outages in the 90 days before it.
12 other vendors we track reported a significant incident within 12 hours of it.

Latest update from Slack

2:21pm PDT Users with custom data retention policies enabled might be unable to see or load older messages. We apologize for the trouble and we'll share more news as it becomes available. 2:49pm PDT We're continuing to investigate an issue affecting a subset of channels with custom message retention settings. Our teams are working to identify the technical trigger and an appropriate fix. We'll provide an update as more news becomes available. 12:35pm PDT We're continuing to investigate an issue affecting a subset of channels with custom message retention settings. Our Teams have restored functionality to the affected retention settings for known impacted customers. We are now working to identify and address any additional concerns regarding the message retention issues. 1:20pm PDT After further investigation, the custom retention settings have not fully been restored yet. Our teams have identified the technical trigger and are currently developing a mitigation plan to mitigate the impa

Read Slack's official incident report ↗