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log <level> <expr> 

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<expr>.klog(<message>)

where <expr> is any valid KRL expression and <message> results in a string (or something that can be cast as a string such as a number).

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The following example would place a string with the value of a variable named query in the log if the rule firedshould fire:

pre {
  query = event:attr("query")
  fire = function(query){
    result = shouldFire(query);
    
  }()
fired { log debug "query:"+query } 

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