3.7.5 - No run left CANCELLING

Enhancements ➕➕

• Add cancelling timeout cleanup producer by @desertaxle in #22238
• Add backend observability for worker channel and cleanup queue by @devin-ai-integration[bot] in #22310

Bug Fixes 🐞

• Fix pending task runs in flow run graph by @devin-ai-integration[bot] in #22287
• Add index on event_resources(occurred) for vacuum performance by @devin-ai-integration[bot] in #22250
• Fix FastAPI 0.137 compatibility — skip route deletion when router is referenced by @devin-ai-integration[bot] in #22277
• Degrade events WebSocket on transient connection failures by @yukiyan in #22241
• Declare ESCAPE character in LIKE expressions for SQLite compatibility by @devin-ai-integration[bot] in #22264
• Snapshot block registry before iterating in auto-registration by @devin-ai-integration[bot] in #22297
• Avoid subflow tracking key collisions by @zzstoatzz in #22286
• Preserve IANA timezone names in RRuleSchedule.from_rrule() by @devin-ai-integration[bot] in #22232
• Handle RecursionError in Flow.serialize_parameters by @chuqCTC in #22245
• Prevent SSRF via remote $ref in JSON schema validation by @chrisguidry in #22252
• URL-encode credentials in asyncpg LISTEN/NOTIFY DSN by @chuqCTC in #22089
• Fix profile inspect --output json emitting invalid JSON for active profile by @devin-ai-integration[bot] in #22317

Development & Tidiness 🧹

• Add "context deadline exceeded" to transient Docker build error patterns by @devin-ai-integration[bot] in #22266
• Use retry_asserts for flaky automation notification test by @devin-ai-integration[bot] in #22246
• Fix stale EventLoopThread globals after fork causing subprocess deadlocks by @devin-ai-integration[bot] in #22308
• Run db_vacuum maintenance queries without the API statement timeout by @zzstoatzz in #22291
• Support AnyIO 4.14 task group interface by @zzstoatzz in #22309
• Bump runtime uv image pins to 0.11.21 by @jakekaplan in #22265
• Migrate CI workflows to prefect-ci-bot trust-tier Apps by @jamiezieziula in #22288

Documentation 📓

• Document Cloud-only features and fix the Cloud badge by @mitchnielsen in #22229
• Add user-facing versioning and compatibility page by @mitchnielsen in #22228
• Document programmatic flow run cancellation by @zzstoatzz in #22243
• Fix deployment name format in schedule creation guide by @devin-ai-integration[bot] in #22284
• Align zombie-flow detection guide with current heartbeat defaults by @devin-ai-integration[bot] in #22285
• Document lifecycle events for automations, concurrency, artifacts, work pools/queues by @github-actions[bot] in #22230

Full Changelog: 3.7.4...3.7.5