Add example interval aggregation to MetricRouter config for CI

.github/ci-router.json

@@ -1,22 +1,37 @@
 {
-    "add_tags" : [
-        {
-            "key" : "cluster",
-            "value" : "testcluster",
-            "if" : "*"
-        },
-        {
-            "key" : "test",
-            "value" : "testing",
-            "if" : "name == 'temp_package_id_0'"
-        }
-    ],
-    "delete_tags" : [
-        {
-            "key" : "unit",
-            "value" : "*",
-            "if" : "*"
-        }
-    ],
-    "interval_timestamp" : true
+  "add_tags": [
+    {
+      "key": "cluster",
+      "value": "testcluster",
+      "if": "*"
+    },
+    {
+      "key": "test",
+      "value": "testing",
+      "if": "name == 'temp_package_id_0'"
+    }
+  ],
+  "delete_tags": [
+    {
+      "key": "unit",
+      "value": "*",
+      "if": "*"
+    }
+  ],
+  "interval_aggregates": [
+    {
+      "name": "temp_cores_avg",
+      "function": "avg(values)",
+      "if": "match('temp_core_%d+', metric.Name())",
+      "tags": {
+        "type": "node"
+      },
+      "meta": {
+        "group": "<copy>",
+        "unit": "<copy>",
+        "source": "MetricAggregator"
+      }
+    }
+  ],
+  "interval_timestamp": true
 }