rhg: signal when falling back in logs
We use the `trace` level for the actual message because it can get really busy.
Differential Revision: https://phab.mercurial-scm.org/D11814
[build-system]
requires = ["setuptools", "wheel"]
[tool.black]
line-length = 80
exclude = '''
build/
| wheelhouse/
| dist/
| packages/
| \.hg/
| \.mypy_cache/
| \.venv/
| mercurial/thirdparty/
'''
skip-string-normalization = true
quiet = true