Significant Changes

Time unit for scheduled_duration and queued_duration changed (#37936)

scheduled_duration and queued_duration metrics are now emitted in milliseconds instead of seconds.

By convention all statsd metrics should be emitted in milliseconds, this is later expected in e.g. prometheus statsd-exporter.

Support for OpenTelemetry Metrics is no longer "Experimental" (#40286)

Experimental support for OpenTelemetry was added in 2.7.0 since then fixes and improvements were added and now we announce the feature as stable.

Bug Fixes

• Fix calendar view scroll (#40458)
• Validating provider description for urls in provider list view (#40475)
• Fix compatibility with old MySQL 8.0 (#40314)
• Fix dag (un)pausing won't work on environment where dag files are missing (#40345)
• Extra being passed to SQLalchemy (#40391)
• Handle unsupported operand int + str when value of tag is int (job_id) (#40407)
• Fix TriggeredDagRunOperator triggered link (#40336)
• Add [webserver]update_fab_perms to deprecated configs (#40317)
• Swap dag run link from legacy graph to grid with graph tab (#40241)
• Change httpx to requests in file_task_handler (#39799)
• Fix import future annotations in venv jinja template (#40208)
• Ensures DAG params order regardless of backend (#40156)
• Use a join for TI notes in TI batch API endpoint (#40028)
• Improve trigger UI for string array format validation (#39993)
• Disable jinja2 rendering for doc_md (#40522)
• Skip checking sub dags list if taskinstance state is skipped (#40578)
• Recognize quotes when parsing urls in logs (#40508)

Doc Only Changes

• Add notes about passing secrets via environment variables (#40519)
• Revamp some confusing log messages (#40334)
• Add more precise description of masking sensitive field names (#40512)
• Add slightly more detailed guidance about upgrading to the docs (#40227)
• Metrics allow_list complete example (#40120)
• Add warning to deprecated api docs that access control isn't applied (#40129)
• Simpler command to check local scheduler is alive (#40074)
• Add a note and an example clarifying the usage of DAG-level params (#40541)
• Fix highlight of example code in dags.rst (#40114)
• Add warning about the PostgresOperator being deprecated (#40662)
• Updating airflow download links to CDN based links (#40618)
• Fix import statement for DatasetOrTimetable example (#40601)
• Further clarify triage process (#40536)
• Fix param order in PythonOperator docstring (#40122)
• Update serializers.rst to mention that bytes are not supported (#40597)

Miscellaneous

• Upgrade build installers and dependencies (#40177)
• Bump braces from 3.0.2 to 3.0.3 in /airflow/www (#40180)
• Upgrade to another version of trove-classifier (new CUDA classifiers) (#40564)
• Rename "try_number" increments that are unrelated to the airflow concept (#39317)
• Update trove classifiers to the latest version as build dependency (#40542)
• Upgrade to latest version of hatchling as build dependency (#40387)
• Fix bug in SchedulerJobRunner._process_executor_events (#40563)
• Remove logging for "blocked" events (#40446)