Profile fallback statistics

Well you could do it if you assume the fall back is working when there is a LB failure.

The following will trigger everytime the LB_FAILED event is triggered which assumes the fall back host is properly working)

 
 when RULE_INIT { 
      log local0. "Initialize the count of requests: [STATS::set fallback "current_count" 0]" 
      set ::count 0 
  
   } 
  
 when HTTP_REQUEST { 
   if { [HTTP::uri] starts_with "/give-me-stats-baby" } { 
         set html_content "Fallback StatisticsIncremented the current count to: [STATS::incr fallback 'current_count']" 
     HTTP::respond 200 content $html_content 
   } 
 } 
  
 when LB_FAILED {    
   log local0. "Incremented the current count to: [STATS::incr fallback "current_count"]" 
 }    
  
  
 

The output will be:

Rule stats_rule : Incremented the current count to: 100

You can also go further by adding /give-me-stats-baby it will output the count via HTML. However please be aware that if you reboot or re-initialize the irule it will go straight back to 0. Also keep in mind that I have tested this so there might be some syntax issue but the general logic is there.

Hope this helps,

CB