QueryMonitor Fatal error: Cannot declare class QM_PHP, because the name is already in use

Case: Staging and production copies of a WordPress 5.4 website on the same server. Activating QueryMonitor 3.9.0 on Staging works, but throws `Fatal error: Cannot declare class QM_PHP` on Production.

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Python 3 PIP Warning: Consider adding this directory to PATH

Case: Running Ubuntu 20.04 w/ Python 3.8 (python3 executable). Installing a script with pip install returns a warning that the path of the script is not present as an environment variable:

WARNING: The script undervolt is installed in '/home/<username>/.local/bin' which is not on PATH. Consider adding this directory to PATH or, if you prefer to suppress this warning, use --no-warn-script-location.

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