There was an incident at 3:30am JST, Nov 17, 2021 for 20 minutes.
Cause: We're still investigating it.
Customers impacted: Chat servers were partially out during that time, users could not make a WebSocket connection.
Resolution: - It happened during a few deployments, we rollbacked immediately when we found it first. - The system became operational at 3:50am JST, Nov 17, 2021.