scheduler.tasks.running metric is always 0

[pdebelak]

Apache Airflow version

2.5.1

What happened

I'd expect the scheduler.tasks.running metric to represent the number of running tasks, but it is always zero. It appears that #10956 broke this when it removed the line that increments num_tasks_in_executor. Right now that variable is set to 0, never incremented, and the emitted as a gauge.

What you think should happen instead

scheduler.tasks.running should either represent the number of tasks running or be removed altogether.

How to reproduce

No response

Operating System

Ubuntu 18.04

Versions of Apache Airflow Providers

No response

Deployment

Official Apache Airflow Helm Chart

Deployment details

No response

Anything else

No response

Are you willing to submit PR?

• Yes I am willing to submit a PR!

Code of Conduct

• I agree to follow this project's Code of Conduct

[pdebelak]

It's unclear to me if self.executor.has_task(task_instance) is still a valid thing to call to increment this or what the correct way to do this is now.