Monday November 23, 2020


Users located in Europe experiencing a degraded service

Issue summary:
On November 23, 2020 from around 2:02 a.m. to 2:20 a.m. PST, some users in Europe experienced their workspaces not updating in real-time, such as being unable to receive new messages automatically. Affected users would've seen a grey banner with a prompt to load new messages.

This issue was caused by a change we made that unintentionally increased the memory usage on some servers. We rolled back the change to resolve the issue.

Note: We've updated the times in this message, as this issue occurred during a different time frame than we initially thought.

5:05 PM PST

We are happy to report that customers should no longer be experiencing degraded performance. If you experience further issues please reach out to Thanks again for bearing with us and sorry again for any interruption caused.

7:28 AM PST

We continue to see some improvement but are not out of the woods just yet. We appreciate your continued patience and we'll report back with further news as soon as we have it.

6:27 AM PST

If you’re affected by the degraded service issue, we’re starting to see some improvements, but we still have some work to do. We’ll confirm when things are back to normal.

5:24 AM PST

Our team have reverted some changes which they believe may have caused the degraded performance for some users in Europe. We are currently assessing whether this has resolved the problem entirely.

4:04 AM PST

Users may be experiencing a degraded service when using Slack at the moment. We believe this is only impacting those located in Europe. We are investigating the cause of the issue, and apologise for the disruption.

3:02 AM PST

Services affected