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{
  "parserClassName": "org.apache.metron.parsers.GrokParser",
  "sensorTopic": "squid",
  "parserConfig": {
    "grokPath": "/apps/metron/patterns/squid",
    "patternLabel": "SQUID_DELIMITED",
    "timestampField": "timestamp"
  },

  "fieldTransformations" : [

     {

     "transformation" : "MTLSTELLAR"
    ,"output" : [ "full_hostname", "domain_without_subdomains" ]
    ,"config" : {
                    "full_hostname" : "URL_TO_HOST(url)"
                   ,"domain_without_subdomains" : "DOMAIN_REMOVE_SUBDOMAINS(full_hostname)"
                   }
     }
]

}

...