Root cause: A software defect caused the worker communication service in the EU region to crash and restart repeatedly. Impacted customers: Customers whose workers use the poll-based communication mode. Runs on those workers were stuck when the run was triggered manually by a user and the stack had a server-side initialization policy attached. Other polling workers may have been briefly delayed while the service restarted.

We have the fix implemented and we will release it shortly.

We have noticed increased number of errors related to polling workers API, we are mitigating the problem.