[skip ci] Fix grafana memory panel legend (#7752)

Signed-off-by: Weida Zhu <weida.zhu@zilliz.com>

deployments/monitor/grafana/milvus-dashboard.json

@@ -16,7 +16,7 @@
   "gnetId": null,
   "graphTooltip": 0,
   "id": 25,
-  "iteration": 1631179997707,
+  "iteration": 1631329496680,
   "links": [],
   "panels": [
     {
@@ -3771,7 +3771,6 @@
       },
       "yaxes": [
         {
-          "$$hashKey": "object:269",
           "format": "short",
           "label": null,
           "logBase": 1,
@@ -3780,7 +3779,6 @@
           "show": true
         },
         {
-          "$$hashKey": "object:270",
           "format": "short",
           "label": null,
           "logBase": 1,
@@ -3844,7 +3842,7 @@
           "expr": "sum(process_resident_memory_bytes{app_kubernetes_io_name=\"$app_name\", app_kubernetes_io_instance=~\"$instance\", namespace=\"$namespace\"})",
           "interval": "",
           "intervalFactor": 2,
-          "legendFormat": "total",
+          "legendFormat": "memory",
           "queryType": "randomWalk",
           "refId": "A"
         }
@@ -3869,7 +3867,6 @@
       },
       "yaxes": [
         {
-          "$$hashKey": "object:345",
           "format": "bytes",
           "label": null,
           "logBase": 1,
@@ -3878,7 +3875,6 @@
           "show": true
         },
         {
-          "$$hashKey": "object:346",
           "format": "bytes",
           "label": null,
           "logBase": 1,
@@ -3968,7 +3964,6 @@
       },
       "yaxes": [
         {
-          "$$hashKey": "object:421",
           "format": "short",
           "label": null,
           "logBase": 1,
@@ -3977,7 +3972,6 @@
           "show": true
         },
         {
-          "$$hashKey": "object:422",
           "format": "short",
           "label": null,
           "logBase": 1,
@@ -4163,7 +4157,6 @@
       },
       "yaxes": [
         {
-          "$$hashKey": "object:92",
           "format": "bytes",
           "label": null,
           "logBase": 1,
@@ -4172,7 +4165,6 @@
           "show": true
         },
         {
-          "$$hashKey": "object:93",
           "format": "bytes",
           "label": null,
           "logBase": 1,
@@ -4720,7 +4712,7 @@
       {
         "allValue": null,
         "current": {
-          "selected": true,
+          "selected": false,
           "text": "test",
           "value": "test"
         },
@@ -4751,9 +4743,9 @@
       {
         "allValue": null,
         "current": {
-          "selected": true,
-          "text": "my-release",
-          "value": "my-release"
+          "selected": false,
+          "text": "All",
+          "value": "$__all"
         },
         "datasource": "$datasource",
         "definition": "label_values(go_info{app_kubernetes_io_name=\"$app_name\", namespace=\"$namespace\"}, app_kubernetes_io_instance)",
@@ -4846,5 +4838,5 @@
   "timezone": "browser",
   "title": "Milvus2.0",
   "uid": "uLf5cJ3Gz",
-  "version": 76
+  "version": 77
 }