Adding a note to mention the alert rule cannot be set at same time everyday

Author: MonikaReddy-MSFT

articles/azure-monitor/alerts/alerts-create-log-alert-rule.md

@@ -168,6 +168,8 @@ Limitations for log search alert rule queries:
     1. Enter values for the **Alert rule name** and the **Alert rule description**.
        > [!NOTE]
        > Notice that rule that uses **Identity** cannot have the character ";" in the **Alert rule name**
+       > Customers cannot set a specific time to run the alert at same time everyday, but they can set frequency to run the alert rule.
+       
     1. Select the **Region**.
     1. <a name="managed-id"></a>In the **Identity** section, select which identity is used by the log search alert rule to send the log query. This identity is used for authentication when the alert rule executes the log query.