Resolved
We've been monitoring the latency throughout the day. It has remained at normal levels, so this incident is now resolved.
Monitoring
Between 12:18 and 12:26, we saw a period of latency against Slack's "create channel" and "send message" endpoints, meaning incident channels were slow to create, and some messages were slow to send. This latency only affected a small proportion of incidents, and we're keeping an eye on the situation.