Sunday December 3, 2023

Issue summary:
On December 3, 2023 from 4:35 PM PST to around 5:29 PM PST, a small number of customers experienced trouble loading parts of Slack such as threads, channels, and direct messages. Affected customers may have also had trouble sending messages and running some workflows.

One of our databases experienced a minor hardware issue. This triggered an automatic intervention from our redundancy systems, and a new database was brought into service. However, the new database entered a state where it could not successfully respond to incoming queries.

As an immediate mitigation step, we performed a manual replacement and redirected the incoming queries to a third database. This resolved the issue for all impacted customers.

8:20 PM PST

We have resolved the issue, and Slack should be back to full functionality for everyone. If you run in to any lingering issues, please refresh Slack with Cmd/Ctrl + Shift + R.

Thank you for bearing with us, we appreciate it.

5:58 PM PST

In addition to the Threads view, customers may also be running in to trouble with blank channels and direct message conversations, issues with some workflows, and problems sending messages. We are working to resolve this as fast as we can. We'll be back with more information in 30 minutes.


Note: We've changed the incident title to better reflect the scope of the issues.

5:27 PM PST

Some customers may be experiencing issues loading the Threads view at the moment. We are actively investigating and we'll provide an update in 30 minutes.

We apologize for the disruption to your work.

4:56 PM PST