Fixing issue Azure#2467 In List Activity Logs $filter is not optional…

… and it requires at least a start time.

specification/monitor/resource-manager/Microsoft.Insights/stable/2015-04-01/activityLogs_API.json

@@ -51,8 +51,8 @@
             "name": "$filter",
             "in": "query",
             "type": "string",
-            "required": false,
-            "description": "Reduces the set of data collected.<br>The **$filter** argument is very restricted and allows only the following patterns.<br>- *List events for a resource group*: $filter=eventTimestamp ge '2014-07-16T04:36:37.6407898Z' and eventTimestamp le '2014-07-20T04:36:37.6407898Z' and resourceGroupName eq 'resourceGroupName'.<br>- *List events for resource*: $filter=eventTimestamp ge '2014-07-16T04:36:37.6407898Z' and eventTimestamp le '2014-07-20T04:36:37.6407898Z' and resourceUri eq 'resourceURI'.<br>- *List events for a subscription in a time range*: $filter=eventTimestamp ge '2014-07-16T04:36:37.6407898Z' and eventTimestamp le '2014-07-20T04:36:37.6407898Z'.<br>- *List events for a resource provider*: $filter=eventTimestamp ge '2014-07-16T04:36:37.6407898Z' and eventTimestamp le '2014-07-20T04:36:37.6407898Z' and resourceProvider eq 'resourceProviderName'.<br>- *List events for a correlation Id*: $filter=eventTimestamp ge '2014-07-16T04:36:37.6407898Z' and eventTimestamp le '2014-07-20T04:36:37.6407898Z' and correlationId eq 'correlationID'.<br><br>**NOTE**: No other syntax is allowed."
+            "required": true,
+            "description": "Reduces the set of data collected.<br>This argument is required and it also requires at least the start date/time.<br>The **$filter** argument is very restricted and allows only the following patterns.<br>- *List events for a resource group*: $filter=eventTimestamp ge '2014-07-16T04:36:37.6407898Z' and eventTimestamp le '2014-07-20T04:36:37.6407898Z' and resourceGroupName eq 'resourceGroupName'.<br>- *List events for resource*: $filter=eventTimestamp ge '2014-07-16T04:36:37.6407898Z' and eventTimestamp le '2014-07-20T04:36:37.6407898Z' and resourceUri eq 'resourceURI'.<br>- *List events for a subscription in a time range*: $filter=eventTimestamp ge '2014-07-16T04:36:37.6407898Z' and eventTimestamp le '2014-07-20T04:36:37.6407898Z'.<br>- *List events for a resource provider*: $filter=eventTimestamp ge '2014-07-16T04:36:37.6407898Z' and eventTimestamp le '2014-07-20T04:36:37.6407898Z' and resourceProvider eq 'resourceProviderName'.<br>- *List events for a correlation Id*: $filter=eventTimestamp ge '2014-07-16T04:36:37.6407898Z' and eventTimestamp le '2014-07-20T04:36:37.6407898Z' and correlationId eq 'correlationID'.<br><br>**NOTE**: No other syntax is allowed."
           },
           {
             "$ref": "#/parameters/SelectParameter"
@@ -80,9 +80,7 @@
         },
         "x-ms-odata": "#/definitions/EventData",
         "x-ms-examples": {
-          "Get Activity Logs without filter or select": { "$ref": "./examples/GetActivityLogsNoParams.json" },
           "Get Activity Logs with filter": { "$ref": "./examples/GetActivityLogsFiltered.json" },
-          "Get Activity Logs with select": { "$ref": "./examples/GetActivityLogsSelected.json" },
           "Get Activity Logs with filter and select": { "$ref": "./examples/GetActivityLogsFilteredAndSelected.json" }
         }
       }