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The syntax of an explicit logging

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expression is:

<expr>.klog(<message>)

where where <expr> is any valid any valid KRL expression. The expression is returned, and <message> results something like the following is added to the console log (and the "Logging" tab of the UI if enabled):

[KLOG] <message> <expr converted to a string>

The syntax of an explicit logging statement in the postlude is:

log <level> <expr> 

where <level> is one of info, warn, error, or debug; and <expr> is any valid KRL expression that results in a string (or something that can be cast as a string such as a number). Explicit logging places statements also place the log message in two places:

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the console

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log, and the "Logging" tab of the UI if

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enabled.

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

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

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Another approach to logging would use explicit error handling.See Debugging KRL for more information on debugging tools.