PrefectHQ/prefect 3.7.0

3.7.0 - Our little features are all grown up 🥲

on GitHub

Prefect 3.7.0 promotes infrastructure decorators and the plugin system to GA. Infrastructure decorators are now ready for defining reusable run infrastructure directly in Python, and plugins now live in first-class settings with backward-compatible support for existing experimental configuration. Turns out they were just going through a phase.

New Features 🎉

• Graduate infrastructure decorators to GA by @desertaxle in #21784
• Promote plugin system from experimental to GA by @desertaxle in #21787
• Add isolated workspace resolver for flow run setup by @desertaxle in #21699

Enhancements ➕➕

• Support inline block placeholder substitution by @hemantmm in #21777
• Render Mermaid.js diagrams in Markdown blocks in ui-v2 by @devin-ai-integration[bot] in #21793
• Eliminate O(N²) checksum scan in read_block_schemas by @VittoriaLanzo in #21754
• Add per-browser UI version switcher by @desertaxle in #21706
• Add server default result storage config surface by @zzstoatzz in #21532
• Route server default result storage through runtime resolution by @zzstoatzz in #21759
• Add flow.generate_mermaid_graph() method for dependency-free flow visualization by @znicholasbrown in #21786
• Route flow-run execute through workspace resolver by @desertaxle in #21796
• Add flow engine module entrypoint by @desertaxle in #21799
• Run prepared pyproject workspaces with uv by @desertaxle in #21801
• Warn when nested ThreadPoolTaskRunner submission would deadlock by @devin-ai-integration[bot] in #21800
• Add cycle detection for block_document references by @Lougarou in #21829

Bug Fixes 🐞

• Use now() helper instead of DateTime.now() in deployment CLI by @devin-ai-integration[bot] in #21769
• Fix race condition in GitRepository.pull_code() with file-based locking by @devin-ai-integration[bot] in #21388
• Retry record_bulk_task_run_events on IntegrityError by @devin-ai-integration[bot] in #21813
• Set custom flow run names before Running events by @devin-ai-integration[bot] in #21803
• Prevent deadlock in mark_deployments_ready / mark_deployments_not_ready by @chuqCTC in #21792
• Fix V2 concurrency lease release errors by @devin-ai-integration[bot] in #21797

Development & Tidiness 🧹

• Avoid run_coro_as_sync deadlock in wait futures test by @devin-ai-integration[bot] in #21766
• Widen timing tolerance for test_flow_run_lateness_when_scheduled by @devin-ai-integration[bot] in #21781
• Widen flow timeout in test_timeout_concurrency_slot_released by @devin-ai-integration[bot] in #21788
• Add apt retry config to old-sqlite.Dockerfile by @devin-ai-integration[bot] in #21814
• Use thread-based pytest-timeout for test_timeout_stops_execution_at_next_task_for_sync_flows by @devin-ai-integration[bot] in #21819
• Add zombie flow detection trigger regression test by @devin-ai-integration[bot] in #21802

Full Changelog: 3.6.29...3.7.0