Host metadata in beats

How does the add_host_metadata fetch the host metadata fields. I am particularly concerned about the below fields in RHEL OS. I want to fetch the same fields using fluent-bit in my application.

         "name":"Mac OS X"
      "ip": ["", ""],
      "mac": ["00:25:96:12:34:56", "72:00:06:ff:79:f1"]

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