Dagster change history: Serverless runs failing to launch

Some Dagster Serverless runs failed to launch in a major outage starting 2023-09-18 18:07 UTC and resolved at 2023-09-19 04:03 UTC, lasting 9 h 55 min. Dagster reported AWS networking issues in two availability zones caused about 30% of new runs to fail container start; it deployed a fallback to stable zones, and the underlying issue appeared resolved.