The dates for maintenance exclusions were changed from the dates

## Announcement Announcement The dates for maintenance exclusions were changed from the dates[announced earlier](https://docs.cloud.google.com/composer/docs/release-notes#November%5F17%5F2025). All Cloud Composer environment's GKE clusters are now set up with **maintenance exclusions** from December 4, 2025 to January 2, 2026\. For more information, see[Maintenance exclusions](https://cloud.google.com/kubernetes-engine/docs/concepts/maintenance-windows-and-exclusions#exclusions). ## Fix Fixed Fixed an issue where `composer.googleapis.com/environment/executor/open_slots`and `composer.googleapis.com/environment/executor/running_tasks` were not available in environments with Airflow 3. ## Feature Feature [**Database retention policy**](https://docs.cloud.google.com/composer/docs/composer-versioning-overview#comparison-airflow-versions) is now available in environments with Airflow 3, starting with composer-3-airflow-3.1.0-build.5\. This change is gradually rolled out in several releases and is available in the following regions in this release: europe-north1, us-west2, us-east1, europe-west3, asia-east2. ## Change Change _(Cloud Composer 3)_ The name format for [network attachments](https://docs.cloud.google.com/composer/docs/composer-3/connect-vpc-network) created by Cloud Composer was modified to enhance uniqueness. This change applies only to newly created network attachments. ## Feature Feature _(Cloud Composer 2)_ Cloud Composer's high availability infrastructure was enhanced to provide greater resilience against zonal outages. This feature was[announced previously](https://docs.cloud.google.com/composer/docs/release-notes#September%5F03%5F2025)and has finished gradually rolling out to all regions supported by Cloud Composer. ## Change Change _(Airflow 3.1.0 and 2.10.5)_ The `apache-airflow-providers-google` package was upgraded to version 19.0.0 in Cloud Composer 2 images and Cloud Composer 3 builds. For more information about changes, see the[apache-airflow-providers-google changelog](https://airflow.apache.org/docs/apache-airflow-providers-google/stable/changelog.html)from version 18.0.0 to version 19.0.0. ## Change Change _(Airflow 3.1.0 and 2.10.5)_ The `apache-airflow-providers-cncf-kubernetes`package was[upgraded to version 10.9.0](https://airflow.apache.org/docs/apache-airflow-providers-cncf-kubernetes/stable/changelog.html). For changes in other packages, see the[preinstalled packages changelog](https://cloud.google.com/composer/docs/versions-packages). ## Change Change New [Airflow builds](https://cloud.google.com/composer/docs/composer-versions#images-composer-3)are available in Cloud Composer 3: * [composer-3-airflow-3.1.0-build.5](https://cloud.google.com/composer/docs/versions-packages#composer-3-airflow-3-1-0-build-5) * [composer-3-airflow-2.10.5-build.22](https://cloud.google.com/composer/docs/versions-packages#composer-3-airflow-2-10-5-build-22) (default) * [composer-3-airflow-2.9.3-build.42](https://cloud.google.com/composer/docs/versions-packages#composer-3-airflow-2-9-3-build-42) ## Change Change New [images](https://cloud.google.com/composer/docs/composer-versions#images-composer-2)are available in Cloud Composer 2: * [composer-2.16.0-airflow-2.10.5](https://cloud.google.com/composer/docs/versions-packages#composer-2-16-0-airflow-2-10-5) (default) * [composer-2.16.0-airflow-2.9.3](https://cloud.google.com/composer/docs/versions-packages#composer-2-16-0-airflow-2-9-3) ## Deprecate Deprecated The following Cloud Composer versions and builds have reached their[end of support period](https://cloud.google.com/composer/docs/composer-versioning-overview#version-deprecation-and-support): composer-3-airflow-2.7.3-build.22, composer-3-airflow-2.7.3-build.23, composer-3-airflow-2.9.3-build.2, composer-3-airflow-2.9.3-build.3, composer-3-airflow-2.9.3-build.4, composer-3-airflow-2.9.3-build.5, composer-3-airflow-2.9.3-build.6, composer-3-airflow-2.9.3-build.7, composer-3-airflow-2.9.3-build.10, composer-2.9.10-\*, composer-2.9.11-\*, composer-2.10.0-\*.