DataLogger.log
You're seeing just the function
log, go back to DataLogger module for more information.
Specs
log(DataLogger.Destination.topic(), data :: term()) :: :ok | {:error, reason :: term()}
This function is the sole entry point of the DataLogger application.
It is used to log/send the data passed to it to the configured destinations.
The topic given can be used to send the data to different sub-destinations of every destination configured.