On April 21, 2023 at 12:04 UTC, we observed increased latency for Publish API calls to our Mumbai Point of Presence. The issue specifically affected some customers whose publish calls are routed through the PubNub Functions service. We scaled up capacity, and the issue was resolved on April 21, 2023 at 13:40 UTC.
To prevent a similar issue from occurring in the future, we are implementing changes to our scaling process to better address these traffic patterns and adding improved alerting and monitoring for earlier warning of such issues. This should assist with faster responses if there are repeated intervals of high load then lower load.