You're seeing just the function send_log, go back to Membrane.Log.Router module for more information.
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send_log(level, message, time, tags \\ [])

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send_log(atom(), any(), String.t(), [atom()]) :: :ok

Sends asynchronous call to the router, requesting it to forward log message to appropriate loggers.

This functions assumes that passed log has level equal or greater than global level.