Apache Airflow version

Other Airflow 3 version (please specify below)

If "Other Airflow 3 version" selected, which one?

3.1.1

What happened?

Pool names can take any character, for example:
pool name with whitespace and emoji😎 is a valid pool name.

However, this will raise an InvalidStatsNameException when reporting metrics such as:

2025-12-30T10:47:28.000732Z [error    ] Invalid stat name: pool.deferred_slots.pool name with whitespace and emoji😎 table. [airflow.metrics.validators] loc=validators.py:125
airflow.exceptions.InvalidStatsNameException: The stat name (pool.running_slots.pool name with whitespace and emoji😎) has to be composed of ASCII alphabets, numbers, or the underscore, dot, or dash characters.

What you think should happen instead?

Valid pool names should report metrics too, and not cause an InvalidStatsNameException. Thinking out loud, we could:

• Transform the name into a valid stat name
• Report metrics using the pool id instead
• Restrict pool names
• ....?

All options are non-ideal because they're all (potential?) breaking changes, so open to alternative options.

How to reproduce

See above

Operating System

N/A

Versions of Apache Airflow Providers

No response

Deployment

Astronomer

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