How to filter warnings for select environments?

[jaraco]

In pypa/setuptools#2865 (comment), I'm attempting to filter out warnings for select environments (Python 3.10+ or PyPy). However, I find that if I try to warnings.filterwarnings in conftest.py, the settings are superseded by settings in pytest.ini.filterwarnings. Is there a supported way to filter warnings on these select enviroments to be applied after the global warning filters are applied?

[jaraco]

I'm thinking something like a pytest_filterwarnings hook would be nice. It could allow warnings to be filtered globally, but happen in a plugin such that it could have runtime effects. Perhaps it should have two phases, to hook in before and after the warning filters are processed from config.