This issue has been resolved. We saw a spike in Slack events due to changing our App's name in the Slack directory. We're taking steps to make sure this doesn't happen again.
Posted Aug 22, 2018 - 15:25 EDT
Update
We are continuing to monitor for any further issues.
Posted Aug 22, 2018 - 14:33 EDT
Monitoring
A fix has been implemented and we are monitoring the results.