luoyuliuyin

Use kubeconfig as one of the optional parameters for creating KubernetesHook

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### Description When we use `KubernetesPodOperator`, we need to create `KubernetesHook` in order to connect to Kubernetes services. There are currently 3 supported methods for creating `KubernetesHook`: 1、environment variable method,...

Feature: Support using content of kubeconfig to create KubernetesHook

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PR of `Use kubeconfig as one of the optional parameters for creating KubernetesHook` closes: https://github.com/apache/airflow/issues/39227 When we use `KubernetesPodOperator`, we need to create `KubernetesHook` in order to connect to Kubernetes...

Fix: Reuse ProcessPoolExecutor in CeleryExecutor

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PR of https://github.com/apache/airflow/issues/39482 When the scheduler send task to celery, if there is only 1 task in the current cycle, the task will be sent to the main thread; if...

### Apache Airflow version 2.9.1 ### If "Other Airflow 2 version" selected, which one? _No response_ ### What happened? When the scheduler send task to celery, if there is only...