Update mesh-mode-grafana.json (#2177)

* Update mesh-mode-grafana.json

fix bugs for more than one instance

* Update mesh-mode-grafana.json

Fix heatmap

docs/en/setup/backend/telemetry/mesh-mode-grafana.json

@@ -450,7 +450,7 @@
       "links": [],
       "targets": [
         {
-          "expr": "rate(mesh_grpc_in_latency_bucket[10m])",
+          "expr": "sum(rate(mesh_grpc_in_latency_bucket[10m])) by (le)",
           "format": "heatmap",
           "hide": false,
           "instant": false,
@@ -864,7 +864,7 @@
       "links": [],
       "targets": [
         {
-          "expr": "rate(persistence_timer_bulk_execute_latency_bucket[10m])",
+          "expr": "sum(rate(persistence_timer_bulk_execute_latency_bucket[10m])) by (le)",
           "format": "heatmap",
           "hide": false,
           "instant": false,
@@ -1116,4 +1116,4 @@
   "title": "SkyWalking mesh-mode dashboard",
   "uid": "P9nAI98mz",
   "version": 4
-}
+}
\ No newline at end of file