PrefectHQ/prefect 3.4.15 on GitHub

What's Changed?

New Features 🎉

Event emission from the command line with prefect event emit
Emit events directly from external systems with the new prefect event emit CLI command. Perfect for triggering deployment runs from CI/CD!
```
prefect event emit user.logged_in --resource-id user-123
prefect event emit order.shipped --resource-id order-456 --payload '{"tracking": "ABC123"}'
```
by @zzstoatzz in #18813

Enhancements ➕➕

Add schedule_after field to RunDeployment action for delayed execution by @chrisguidry in #18801
Update deployment concurrency limit lease maintenance to raise on failure by @desertaxle in #18811
Enable metrics server on workers by @bdalpe in #18630
Add artifact created and updated events by @zangell44 in #18818

Bug Fixes 🐞

Fix metric trigger validation in automations schema by @zzstoatzz in #18773
Fix event filter empty label value arrays to return no results by @chrisguidry in #18810
Special case for proactive automation by @jakekaplan in #18819
Add dictionary handling into _to_environment_variable_value by @vyagubov in #18817

Development & Tidiness 🧹

Fix workflow to publish prefect-aws images when triggered via workflow_call by @desertaxle in #18763
Bump ruff from 0.12.8 to 0.12.10 by @dependabot[bot] in #18768
Fix CloudFormation template generation during prefect-aws release by @desertaxle in #18792
Skip validating generated CloudFormation templates by @desertaxle in #18794
Add uv set up to integration package release by @desertaxle in #18793

Documentation 📓

Overhaul ECS Worker Guide by @bdalpe in #18756
Add PREFECT_SERVER_EVENTS_CAUSAL_ORDERING to self-hosted docs by @zzstoatzz in #18774
Fix profiles_path rendering in settings ref by @rcash in #18772
Document PostgreSQL 14.9+ requirement by @desertaxle in #18784
Add SQS queue and EventBridge setup to ECS worker manual deployment guide by @desertaxle in #18789
Fix Docker healthcheck documentation to use Python instead of curl by @zzstoatzz in #18809

Full Changelog: 3.4.14...3.4.15