Add workers.celery.topologySpreadConstraints & workers.kubernetes.topologySpreadConstraints

[Miretpl]

related: #28880

This PR introduces two new fields: workers.celery.topologySpreadConstraints and workers.kubernetes.topologySpreadConstraints. The workers.topologySpreadConstraints field is now deprecated.

---

Was generative AI tooling used to co-author this PR?

• Yes (please specify the tool below)

---

• Read the Pull Request Guidelines for more information. Note: commit author/co-author name and email in commits become permanently public when merged.
• For fundamental code changes, an Airflow Improvement Proposal (AIP) is needed.
• When adding dependency, check compliance with the ASF 3rd Party License Policy.
• For significant user-facing changes create newsfragment: {pr_number}.significant.rst, in airflow-core/newsfragments. You can add this file in a follow-up commit after the PR is created so you know the PR number.

[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

Adds executor-specific topology spread constraint configuration for workers in the Helm chart, deprecating the previous shared workers.topologySpreadConstraints field.

Changes:

• Introduces workers.celery.topologySpreadConstraints and workers.kubernetes.topologySpreadConstraints in values + schema.
• Adds deprecation messaging for workers.topologySpreadConstraints (schema description + Helm NOTES).
• Updates Helm tests to validate precedence/overrides for the new fields.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
helm-tests/tests/helm_tests/airflow_core/test_worker_sets.py	Extends test matrix to cover Celery worker-set overrides for topology spread constraints.
helm-tests/tests/helm_tests/airflow_core/test_worker.py	Parametrizes worker deployment test to validate deprecated vs new Celery-specific topology spread constraints precedence.
helm-tests/tests/helm_tests/airflow_aux/test_pod_template_file.py	Parametrizes pod-template-file test to validate deprecated vs new Kubernetes-specific topology spread constraints precedence.
chart/values.yaml	Documents deprecation and adds new values keys for Celery/Kubernetes worker topology spread constraints.
chart/values.schema.json	Deprecates old schema description and adds schema entries for new keys.
chart/templates/NOTES.txt	Adds a deprecation warning when old workers.topologySpreadConstraints is used.
chart/files/pod-template-file.kubernetes-helm-yaml	Switches pod template to prefer workers.kubernetes.topologySpreadConstraints over deprecated/shared fields.

[github-actions]

Backport successfully created: chart/v1-2x-test

Note: As of Merging PRs targeted for Airflow 3.X
the committer who merges the PR is responsible for backporting the PRs that are bug fixes (generally speaking) to the maintenance branches.

In matter of doubt please ask in #release-management Slack channel.

Status	Branch	Result
✅	chart/v1-2x-test