This is a tiny Go logger for Numelon projects. It is Numelon Nuxis compatible.
It has concurrent-safe writes, coloured terminal output for fun during development, plain output, and systemd-journald output with the correct priorities.
Look at the source code, it is short enough and straightforward to grasp.
Logging by itself is safe to use concurrently.
Configuration on the other hand with SetLevel, SetWriter, and SetOutputMode are NOT mutable concurrent state.
Configure the logger once during initialisation, before starting any concurrent logging, and then leave it alone.