What's Changed

New Features 🎉

• allow JSON values in Secret block by @zzstoatzz in https://github.com/PrefectHQ/prefect/pull/14980
• Workers enforce Deployment.concurrency_limits by @jeanluciano in https://github.com/PrefectHQ/prefect/pull/15022
• Improve logging on result serialization errors by @desertaxle in https://github.com/PrefectHQ/prefect/pull/15084
• record task run followers by @jakekaplan in https://github.com/PrefectHQ/prefect/pull/15100
• Switch to profile with matching PREFECT_API_URL on server start by @desertaxle in https://github.com/PrefectHQ/prefect/pull/15122

Bug Fixes 🐞

• Revert change to defer building the server-side version of PrefectBaseModel by @desertaxle in https://github.com/PrefectHQ/prefect/pull/15072
• Fixes prefect server start for Windows machines by @desertaxle in https://github.com/PrefectHQ/prefect/pull/15103
• Fix CloudUnauthorized case in prefect dashboard open by @zzstoatzz in https://github.com/PrefectHQ/prefect/pull/15106
• ensure on_failure hook runs upon parameter validation error by @zzstoatzz in https://github.com/PrefectHQ/prefect/pull/15109
• Update model_rebuild in main.py to explicitly pass namespace types by @desertaxle in https://github.com/PrefectHQ/prefect/pull/15117

Development & Tidiness 🧹

• Avoid result factories if persistence is turned off for a task by @cicdw in https://github.com/PrefectHQ/prefect/pull/15055
• Remove UnpersistedResult by @cicdw in https://github.com/PrefectHQ/prefect/pull/15056
• Replace PersistedResultBlob with ResultRecord by @desertaxle in https://github.com/PrefectHQ/prefect/pull/15064
• Update @prefecthq/prefect-ui-library to version 3.7.2 by @marvin-robot in https://github.com/PrefectHQ/prefect/pull/15082
• a couple typing and error improvements by @zzstoatzz in https://github.com/PrefectHQ/prefect/pull/15081
• Bump vite from 5.4.1 to 5.4.2 in /ui by @dependabot in https://github.com/PrefectHQ/prefect/pull/15068
• Bump micromatch from 4.0.5 to 4.0.8 in /ui by @dependabot in https://github.com/PrefectHQ/prefect/pull/15083
• Update @prefecthq/prefect-ui-library to version 3.7.3 by @marvin-robot in https://github.com/PrefectHQ/prefect/pull/15097
• Updates warning message when result persistence fails by @desertaxle in https://github.com/PrefectHQ/prefect/pull/15099
• fix typing and docstring for concurrency ctx managers by @zzstoatzz in https://github.com/PrefectHQ/prefect/pull/15108
• Remove unused Manifest class by @desertaxle in https://github.com/PrefectHQ/prefect/pull/15111
• Update @prefecthq/prefect-ui-library to version 3.7.5 by @marvin-robot in https://github.com/PrefectHQ/prefect/pull/15116
• Update @prefecthq/prefect-ui-library to version 3.7.6 by @marvin-robot in https://github.com/PrefectHQ/prefect/pull/15125
• Update @prefecthq/prefect-ui-library to version 3.7.7 by @marvin-robot in https://github.com/PrefectHQ/prefect/pull/15126
• annotation type fixes by @zzstoatzz in https://github.com/PrefectHQ/prefect/pull/15124

Uncategorized

• Test experimental_defer_build_mode with defer_build=True by @abrookins in https://github.com/PrefectHQ/prefect/pull/15052
• Readme updates: formatting typo and messaging updates by @sarahmk125 in https://github.com/PrefectHQ/prefect/pull/14952
• bugfix for sorting scheduled flow_runs by @tmylt in https://github.com/PrefectHQ/prefect/pull/14993
• Add whats new and upgrade guide by @jlowin in https://github.com/PrefectHQ/prefect/pull/14996
• add prefect dashboard open to open dashboard from CLI by @zzstoatzz in https://github.com/PrefectHQ/prefect/pull/14985
• simplify on_crash hook example by @zzstoatzz in https://github.com/PrefectHQ/prefect/pull/15079
• improve Manage concurrency docs by @zzstoatzz in https://github.com/PrefectHQ/prefect/pull/15088
• Quotes the components of a PostgreSQL connection URL when built from components by @chrisguidry in https://github.com/PrefectHQ/prefect/pull/15094
• minor docs formatting fixes by @zzstoatzz in https://github.com/PrefectHQ/prefect/pull/15105
• Update artifacts doc page by @discdiver in https://github.com/PrefectHQ/prefect/pull/15093
• Update language in quickstart by @cicdw in https://github.com/PrefectHQ/prefect/pull/15115
• Update write tasks page for clarity by @desertaxle in https://github.com/PrefectHQ/prefect/pull/15118
• Updates to logging page for clarity by @desertaxle in https://github.com/PrefectHQ/prefect/pull/15119
• Go through contributing docs by @cicdw in https://github.com/PrefectHQ/prefect/pull/15120
• Add Prefect Cloud IP Allowlist CLI by @collincchoy in https://github.com/PrefectHQ/prefect/pull/15087
• bubble up hydration placeholders by @jakekaplan in https://github.com/PrefectHQ/prefect/pull/15132
• Update work pools doc for flow and clarity by @desertaxle in https://github.com/PrefectHQ/prefect/pull/15127

New Contributors

• @tmylt made their first contribution in https://github.com/PrefectHQ/prefect/pull/14993

Full Changelog: https://github.com/PrefectHQ/prefect/compare/3.0.0rc19...3.0.0rc20