External data Group URI hit counts

[root@ve11a:Active:Changes Pending] config  tmsh list ltm virtual bar
ltm virtual bar {
    destination 172.28.19.252:80
    ip-protocol tcp
    mask 255.255.255.255
    profiles {
        http { }
        tcp { }
    }
    rules {
        myrule
    }
    snat automap
    vlans-disabled
}
[root@ve11a:Active:Changes Pending] config  tmsh list ltm pool foo1
ltm pool foo1 {
    members {
        200.200.200.101:80 {
            address 200.200.200.101
        }
    }
}
[root@ve11a:Active:Changes Pending] config  tmsh list ltm pool foo2
ltm pool foo2 {
    members {
        200.200.200.102:80 {
            address 200.200.200.102
        }
    }
}
[root@ve11a:Active:Changes Pending] config  tmsh list ltm data-group external uri_class
ltm data-group external uri_class {
    external-file-name uri_class_file
    type string
}
[root@ve11a:Active:Changes Pending] config  cat /config/filestore/files_d/Common_d/data_group_d/\:Common\:uri_class_file_1
"/app1" := "foo1",
"/app2/" := "foo2",
[root@ve11a:Active:Changes Pending] config  tmsh list ltm rule myrule
ltm rule myrule {
    when HTTP_REQUEST {
   set uri [string tolower [HTTP::uri]]
   if {[class match -- $uri starts_with uri_class]} {
      ISTATS::incr "ltm.virtual /Common/bar counter [class match -name $uri starts_with uri_class]" 1
      pool [class match -value $uri starts_with uri_class]
   }
}
}

 istats is in User-defined section.

[root@ve11a:Active:Changes Pending] config  tmsh show ltm virtual bar

---------------------------------------------------------
Ltm::Virtual Server: bar
---------------------------------------------------------
Status
  Availability     : unknown
  State            : enabled
  Reason           : The children pool member(s) either don't have service checking enabled, or service check results are not available yet
  CMP              : enabled
  CMP Mode         : all-cpus
  Destination      : 172.28.19.252:80

Traffic                    ClientSide  Ephemeral  General
  Bits In                      474.0K          0        -
  Bits Out                     916.1K          0        -
  Packets In                      795          0        -
  Packets Out                     790          0        -
  Current Connections               0          0        -
  Maximum Connections             100          0        -
  Total Connections               158          0        -
  Min Conn Duration/msec            -          -        8
  Max Conn Duration/msec            -          -     2.0K
  Mean Conn Duration/msec           -          -     2.0K
  Total Requests                    -          -      158

CPU Usage Ratio (%)
  Last 5 Seconds                    0
  Last 1 Minute                     0
  Last 5 Minutes                    0

User-defined  Value
  /app1   101
  /app2/   51