[cbartz]

Applicable spec: N/A

Overview

Replace python-libjuju await calls in test_prometheus_metrics with synchronous jubilant calls. The fixture now returns the app name (str) instead of the Application object, and the test uses juju.config() + polling helpers instead of instance_helper.ensure_charm_has_runner() / await app.set_config().

Rationale

The test is quite flaky, due to hanging AllWatcher hang after cross-controller integrations.

Juju Events Changes

N/A

Module Changes

N/A

Library Changes

N/A

Checklist

• The charm style guide was applied.
• The contributing guide was applied.
• The changes are compliant with ISD054 - Managing Charm Complexity
• The documentation for charmhub is updated.
• The PR is tagged with appropriate label (urgent, trivial, complex).
• The changelog is updated with changes that affects the users of the charm.
• The application version number is updated in github-runner-manager/pyproject.toml.

[yanksyoon]

LGTM, thanks for fixing this!