CandleClock.ErrorLogger.log_formatted

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

log_formatted(formatted, message, level \\ :error, metadata \\ [])

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Specs

log_formatted(
  binary(),
  message(),
  level :: Logger.level(),
  metadata :: Logger.metadata()
) :: no_return()

Logs a formatted error with an optional preceding message.