CandleClock.ErrorLogger.log_exit

You're seeing just the macro log_exit, go back to CandleClock.ErrorLogger module for more information.
Link to this macro

log_exit(error, pid \\ nil, log_level \\ :error, metadata \\ [])

View Source (macro)

Like log_error/3, but is used to log caught exits.

When the pid is given, it will pass {:EXIT, pid} instead of :exit to Exception.format/3.