The issue has been resolved.

The team has traced the scheduling delays to packet loss at an upstream network provider (AS1299 / Arelion), affecting both IPv4 and IPv6 traffic. We are continuing to monitor the situation and will share further updates as they become available.

The system has recovered. The team is investigating the cause.

The team is investigating elevated scheduling delays for uptime monitors & API checks in the us-west-1 region.