Heat Maps irule by Colin.

Ive tried this rule out as well and had to edit it to get it to work correctly. It seems the author didnt actually test the final rule. In testing the recently edited rule works fantastic and amazed my CEO; in production however, it is a different story. Within 1 min of being deployed onto our production site the Google Chart API started denying traffic. The bigIP LTM CPU ramped up to 100% and another min after that and the whole bigip LTM device crashed completely. Upon restart of the device we had to wait almost an hour for the TMM to finish cleanup before traffic started serving again. Here is the modified rule that caused the trouble.

when RULE_INIT {
      Configure static portions of the HTML response for the heatmap pages
      set static::resp1 ""
   }

   
when HTTP_REQUEST timing on {
if {  [HTTP::uri] != "/"}  { 
     switch -glob [string tolower [HTTP::uri]] {
       "/asia*" - 
       "/africa*" - 
       "/europe*" - 
       "/middle_east*" - 
       "/south_america*" - 
       "/usa*" -
       "/world*" - 
       "/heatmap*" {
         set chld ""  
         set chd ""
         set zoom ""
         set zoomURL ""  
         set regions ""  
         set urlTotal 0  
         set regionTotal 0 
     Split apart the zoom region from the filter URL in the request  
         set zoom [getfield [string map {"/" "" "heatmap" "world"} [HTTP::uri]] "?" 1]
         set zoomURL [getfield [string map {"/" "" "heatmap" "world"} [HTTP::uri]] "?" 2]
     Get a list of all states or countries, applying the URL filter where necessary
     and retrieve the associated count of requests from that area to that URL
       First step through the mytables table, which is a pointer table referencing all subtables with counter values in them
         foreach mysub [table keys -subtable mytables] {
       Next determine whether to search state or country tables
           if {$zoom eq "usa"} {
             if {$mysub starts_with "state:"} { 
       For each state sub table step through each key, which will be a URL, and count the request to that URL.
       This is also where URL filtering is applied if applicable
               foreach myurl [table keys -subtable $mysub] {
                 if {$zoomURL ne ""} { 
                   if {$myurl eq $zoomURL} {  
                     append chld "[getfield $mysub ":" 2]"
                     append chd "[table lookup -subtable $mysub $myurl],"
                     set urlTotal [table lookup -subtable $mysub $myurl]
                   }
                 } else {
                   append chld "[getfield $mysub ":" 2]"
                   append chd "[table lookup -subtable $mysub $myurl],"  
                   set urlTotal [table lookup -subtable $mysub $myurl]
                 }
                 set regionTotal [expr $regionTotal + $urlTotal]  
                 set urlTotal 0  
               }  
               append regions "[getfield $mysub ":" 2] : $regionTotal
"
               set regionTotal 0
             } 
           } else {
             if {$mysub starts_with "country:"} { 
               foreach myurl [table keys -subtable $mysub] {
                 if {$zoomURL ne ""} { 
                   if {$myurl eq $zoomURL} {  
                     append chld "[getfield $mysub ":" 2]"
                     append chd "[table lookup -subtable $mysub $myurl],"
                     set urlTotal [table lookup -subtable $mysub $myurl]
                   }
                   set regionTotal [expr $regionTotal + $urlTotal]  
                   set urlTotal 0  
                 } else {
                   append chld "[getfield $mysub ":" 2]"
                   append chd "[table lookup -subtable $mysub $myurl],"  
                   set urlTotal [table lookup -subtable $mysub $myurl]
                 }
                   set regionTotal [expr $regionTotal + $urlTotal]  
                     set urlTotal 0    
               }  
               append regions "[getfield $mysub ":" 2] : $regionTotal
"
               set regionTotal 0
             } 
           }
         }
 
 
     Send back the pre-formatted response, set in RULE_INIT, combined with the map zoom, list of areas, and request count
         set chd [string trimright $chd ","] 
       First loop through the trackingurls class to get a list of all URLs to be tracked and format HTML around them for links
         set filters ""  
         foreach mytrackingurl [class names trackingurls] {
           append filters " | "
         }  
         set filters [string trimright $filters " | "]   
  
       Combine the above generated HTML with the static HTML in RULE INIT and respond to the client
        HTTP::respond 200 content "${static::resp1}${regions}${static::resp2}${zoom}&chd=t:${chd}&chld=${chld}${static::resp3}Filter by URL:  | $filters $static::resp4"
       }
      
      "/resetmap" {
        foreach pointertable [table keys -subtable mytables] {
          foreach entry [table keys -subtable $pointertable] {
            table delete -subtable $pointertable $entry
          }  
        } 
        foreach pointerentry [table keys -subtable mytables] {
          table delete -subtable mytables $pointerentry
        }  
        HTTP::respond 200 Content "
Table Cleared."
      }
   
      default {
   Look up country & state locations 
        set cloc [whereis [IP::client_addr] country]
        set sloc [whereis [IP::client_addr] abbrev]
      
    If the IP doesn't resolve to anything, pick a random IP (useful for testing on private networks)Uncomment for test.
        if {($cloc eq "") and ($sloc eq "")} { 
          set ip [expr { int(rand()*255) }].[expr { int(rand()*255) }].[expr { int(rand()*255) }].[expr { int(rand()*255) }]
          set cloc [whereis $ip country]
          set sloc [whereis $ip abbrev]
          if {($cloc eq "") or ($sloc eq "")} {  
              set cloc "US"
            set sloc "WA"
          }
        }
   
    Strip slashes from URI to allow easy queries
        set friendlyURL [string map {/ ""} [HTTP::uri]]
    Create a new table named country:location or state:location
        if {[table incr -subtable country:$cloc -mustexist $friendlyURL] eq ""} {
          table set -subtable country:$cloc $friendlyURL 1 indefinite indefinite
        }  
    Update the mytables pointer table with the new country or state table name  
        if {[table incr -subtable mytables -mustexist country:$cloc] eq ""} {
          table set -subtable mytables country:$cloc 1 indefinite indefinite
        }  
    Same as above for states, not countries.
        if {$cloc eq "US"} {  
          if {[table incr -subtable state:$sloc -mustexist $friendlyURL] eq ""} {
              table set -subtable state:$sloc $friendlyURL 1 indefinite indefinite
          }  
          if {[table incr -subtable mytables -mustexist state:$sloc] eq ""} {
             table set -subtable mytables state:$sloc 1 indefinite indefinite
          }    
        }
Uncomment if you want to see what state you are coming from.
        HTTP::respond 200 Content "Added - Country: $cloc State: $sloc"
  }   
 }
}
}
 site usage Heatmap:Connections per Region:
"
      set static::resp2  "
Click to zoom to region: |  |  |  |  |  | "
      set static::resp4 "