diff --git a/schemas/2015-04-01/Microsoft.Insights.json b/schemas/2015-04-01/Microsoft.Insights.json
index 53bf84cce2..eed7f42641 100644
--- a/schemas/2015-04-01/Microsoft.Insights.json
+++ b/schemas/2015-04-01/Microsoft.Insights.json
@@ -291,6 +291,17 @@
           ],
           "description": "List of dimension conditions. For example: [{\"DimensionName\":\"AppName\",\"Operator\":\"Equals\",\"Values\":[\"App1\"]},{\"DimensionName\":\"Deployment\",\"Operator\":\"Equals\",\"Values\":[\"default\"]}]."
         },
+        "dividePerInstance": {
+          "oneOf": [
+            {
+              "type": "boolean"
+            },
+            {
+              "$ref": "https://schema.management.azure.com/schemas/common/definitions.json#/definitions/expression"
+            }
+          ],
+          "description": "a value indicating whether metric should divide per instance."
+        },
         "metricName": {
           "type": "string",
           "description": "the name of the metric that defines what the rule monitors."