grafana: update goaurrpc dashboard (rate-limit chart)

Add panel to visualize how many requests end up being rate-limited

Signed-off-by: moson-mo <mo-son@mailbox.org>

roles/grafana/files/dashboards/goaurrpc.json

@@ -493,6 +493,99 @@
       "title": "Requests per second",
       "type": "timeseries"
     },
+    {
+      "datasource": {
+        "type": "prometheus",
+        "uid": "Prometheus"
+      },
+      "fieldConfig": {
+        "defaults": {
+          "color": {
+            "mode": "palette-classic"
+          },
+          "custom": {
+            "axisCenteredZero": false,
+            "axisColorMode": "text",
+            "axisLabel": "",
+            "axisPlacement": "auto",
+            "axisSoftMin": 0,
+            "barAlignment": 0,
+            "drawStyle": "line",
+            "fillOpacity": 0,
+            "gradientMode": "none",
+            "hideFrom": {
+              "legend": false,
+              "tooltip": false,
+              "viz": false
+            },
+            "lineInterpolation": "linear",
+            "lineWidth": 1,
+            "pointSize": 5,
+            "scaleDistribution": {
+              "type": "linear"
+            },
+            "showPoints": "auto",
+            "spanNulls": false,
+            "stacking": {
+              "group": "A",
+              "mode": "none"
+            },
+            "thresholdsStyle": {
+              "mode": "off"
+            }
+          },
+          "mappings": [],
+          "thresholds": {
+            "mode": "absolute",
+            "steps": [
+              {
+                "color": "green",
+                "value": null
+              },
+              {
+                "color": "red",
+                "value": 80
+              }
+            ]
+          }
+        },
+        "overrides": []
+      },
+      "gridPos": {
+        "h": 5,
+        "w": 24,
+        "x": 0,
+        "y": 12
+      },
+      "id": 25,
+      "options": {
+        "legend": {
+          "calcs": [],
+          "displayMode": "list",
+          "placement": "bottom",
+          "showLegend": true
+        },
+        "tooltip": {
+          "mode": "single",
+          "sort": "none"
+        }
+      },
+      "targets": [
+        {
+          "datasource": {
+            "type": "prometheus",
+            "uid": "Prometheus"
+          },
+          "editorMode": "builder",
+          "expr": "rate(rpc_requests_rate_limited[5m])",
+          "legendFormat": "requests",
+          "range": true,
+          "refId": "A"
+        }
+      ],
+      "title": "Requests rate-limited per second",
+      "type": "timeseries"
+    },
     {
       "datasource": {
         "type": "prometheus",
@@ -554,7 +647,7 @@
         "h": 5,
         "w": 24,
         "x": 0,
-        "y": 12
+        "y": 17
       },
       "id": 8,
       "options": {
@@ -650,7 +743,7 @@
         "h": 5,
         "w": 24,
         "x": 0,
-        "y": 17
+        "y": 22
       },
       "id": 10,
       "options": {
@@ -702,7 +795,7 @@
           "refId": "average"
         }
       ],
-      "title": "Request duration",
+      "title": "Request processing duration",
       "type": "timeseries"
     },
     {
@@ -767,7 +860,7 @@
         "h": 5,
         "w": 24,
         "x": 0,
-        "y": 22
+        "y": 27
       },
       "id": 16,
       "options": {
@@ -800,7 +893,7 @@
     }
   ],
   "refresh": "30s",
-  "schemaVersion": 37,
+  "schemaVersion": 38,
   "style": "dark",
   "tags": [],
   "templating": {