Significant Changes

The helm chart is now using a newer version of bitnami/postgresql dependency (#34817)

The version of bitnami/postgresql subchart upgraded from 12.10.0 to 13.2.24. The version of PostgreSQL binaries upgraded from 11 to 16.1.0.

The change requires existing bitnami/postgresql subchart users to perform manual major version upgrade using pg_dumpall or pg_upgrade.

As a reminder, it is recommended to set up an external database <https://airflow.apache.org/docs/helm-chart/stable/production-guide.html#database>_ in production.

Default Airflow image is updated to 2.8.1 (#36907)

The default Airflow image that is used with the Chart is now 2.8.1, previously it was 2.7.1.

Default PgBouncer and PgBouncer Exporter images have been updated (#36898)

The PgBouncer and PgBouncer Exporter images are based on newer software/os.

• pgbouncer: 1.21.0 based on alpine 3.14 (airflow-pgbouncer-2024.01.19-1.21.0)
• pgbouncer-exporter: 0.16.0 based on alpine 3.19 (apache/airflow:airflow-pgbouncer-exporter-2024.01.19-0.16.0)

Default StatsD image is updated to v0.26.0 (#37187)

The default StatsD image that is used with the Chart is now v0.26.0, previously it was v0.22.8.

Default Redis image is updated to 7-bookworm (#37187)

The default Redis image that is used with the Chart is now 7-bookworm, previously it was 7-bullseye.

New Features

• Enable native HPA for Airflow Workers (#36174)
• Add init container + sidecar support for Airflow Kerberos (#35548)
• Support MySQL backend as KEDA trigger (#36167)

Improvements

• Improve PriorityClass to improve debuggability (#36365)
• Add securityContexts in dag processors log groomer sidecar (#34499)
• Add support for securityContexts in dag processors wait-for-migrations container (#35593)
• Add templating for PVC storageClassName (#35581)
• Add volumeClaimTemplate for worker (#34986)
• Add support for priorityClassName on Redis pods (#34879)
• Configurable mount path for DAGs volume (#35083)
• Add support for custom emptyDir config (#34837)
• Added ability to enable/disable scheduler and webserver (#36991)

Bug Fixes

• Fix StatsD host in Airflow config (#35679)
• Set AIRFLOW_HOME env var with airflowHome value (#34839)
• Safer worker pod annotations (#35309)
• Set worker safeToEvict properly (#35130)
• Fix Redis broker URL with useStandardNaming (#34825)
• Fix metadata DB & port in KEDA connection when usePgbouncer is false (#34741)
• Fix PgBouncer connection with useStandardNaming (#34787)

Doc only changes

• Add docs about extending the Airflow Helm chart (#36331)
• Add comment for Elasticsearch connection scheme (#35588)
• Add notes about Virtualenvs preventing the need for custom images (#35306)

Misc

• Default Airflow version to 2.8.1 (#36907)
• Support git-sync v4 (#34731)
• Upgrade bitnami/postgresql subchart to 13.2.24 (#36156)
• Change git sync container indent to 4 (#35824)
• Remove K8S 1.24 support (#35214)
• Rebuild pgbouncer and pgbouncer-exporter images with newer versions (#36898)
• Update statsd and redis chart images (#37187)