Tuesday September 23, 2025

Summary

Starting around 12:15 PM PDT until around 4:10 PM PDT on September 23, 2025, some users experienced errors and latency when attempting to query items using the AI search feature in Slack.

A backend search system encountered an unexpected spike in processing times, resulting in downstream latency and timeouts when users would attempt to use Slack AI search. We identified the cause of the unexpected processing spike and introduced additional load handling measures to resolve the issue for all users.

1:25 PM PST

Resolved

We’ve successfully reverted the earlier change that was causing this issue. We’ve also completed monitoring capacity usage and latency on our infrastructure, and see that performance has returned to its expected levels. This incident is now resolved. We apologise for any disruption caused to customers and appreciate your patience with this issue.

4:27 PM PST

Update

Upon further investigation, we determined users may observe errors in addition to slowness. We identified and are reverting a recent change that caused the issue. While we monitor the progress of the change revert, we are actively increasing the capacity of our search infrastructure. Users may observe improved search latency as we continue our work.

Thank you for your patience as we work to resolve this issue. We'll provide and update as soon as we have additional information to share.

3:26 PM PST

Investigating

We're currently investigating an issue where some users may observe slowness with AI search summaries and general slowness with search functionality. We will provide an update once more information becomes available. Thanks for sticking with us as we work to resolve this issue.

2:32 PM PST