MetaLogger.debug

You're seeing just the function debug, go back to MetaLogger module for more information.
Link to this function

debug(chardata_or_fun, metadata \\ [])

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Logs a debug message keeping logger metadata from caller processes. Returns :ok or an {:error, reason} tuple.

Examples

MetaLogger.debug("hello?")
MetaLogger.debug(fn -> "dynamically calculated debug" end)
MetaLogger.debug(fn -> {"dynamically calculated debug", [additional: :metadata]} end)