BUG/MINOR: add last_chk in stats

Author: hdurand0710

models/native_stat_stats.go

@@ -7188,6 +7188,7 @@ definitions:
           hrsp_other: 0
           iid: 0
           intercepted: 346
+          last_chk: L4OK in 0ms
           mode: http
           pid: 3204
           rate: 64
@@ -7471,6 +7472,11 @@ definitions:
                       - frontend
                       - backend
               x-nullable: true
+          last_chk:
+              type: string
+              x-dependency:
+                  type: server
+              x-nullable: true
           lastchg:
               type: integer
               x-dependency:

models/native_stat_stats_compare.go

@@ -384,6 +384,11 @@ native_stat_stats:
       x-nullable: true
       x-dependency:
         type: frontend
+    last_chk:
+      type: string
+      x-nullable: true
+      x-dependency:
+        type: server
   example:
     scur: 129
     smax: 2000
@@ -420,3 +425,4 @@ native_stat_stats:
     intercepted: 346
     dcon: 0
     dses: 0
+    last_chk: "L4OK in 0ms"