Slack Connectivity, API Issues
Resolved
This incident has been resolved.
Update
Most issues related to Slack APIs and Workflows should now be resolved; however, Slack continues to monitor issues with mentions and replaying older events: https://slack-status.com/
Investigating
Slack is experiencing widespread connectivity, app, and API issues. Users may experience problems with Slack log-ins, load times, and other API-related features such as messaging, workflows, and threads. Slack is aware of the issue and is working to resolve: https://slack-status.com/