The GitHub Actions job "Check newsfragment PR number" on 
airflow.git/fix/scheduler/dbdagbag-unbounded-cache has failed.
Run started by GitHub user jason810496 (triggered by jason810496).

Head commit for run:
e3a4ee1ed6246bc61d4620a0457efb38aec87d3e / LIU ZHE YOU <[email protected]>
Require a metric namespace whenever the Dag cache is enabled

An empty-string default let a subclass that forgot its namespace drop its cache
metrics silently, and the registry test only pins the namespaces of the
subclasses it already knows about, so nothing would catch it.

Declaring the namespace as a property that raises turns that into a loud
failure on the first emission. A cache is a per-component concern, so a caching
bag with nothing to attribute its activity to is a programming error rather
than a configuration to tolerate.

Report URL: https://github.com/apache/airflow/actions/runs/32022251919

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