fix issue for monitor (#14364)

Author: Youri970410

src/Monitor/Monitor/Metrics/GetAzureRmMetricCommand.cs

@@ -153,7 +153,7 @@ protected override void ProcessRecordInternal()
                 timegrain = null;
             }
             string metricNames = (this.MetricName != null && this.MetricName.Count() > 0) ? string.Join(",", this.MetricName) : null;
-            string aggregation = (this.AggregationType != null && this.AggregationType.HasValue) ? this.AggregationType.Value.ToString() : null;
+            string aggregation = this.AggregationType.HasValue ? this.AggregationType.Value.ToString() : null;
             int? top = (this.Top == default(int?)) ? null : this.Top;
             string orderBy = (this.OrderBy == default(string)) ? null : this.OrderBy;
             ResultType? resultType = (this.ResultType == default(ResultType?)) ? null : this.ResultType;

src/Monitor/Monitor/ScheduledQueryRules/NewScheduledQueryRuleCommand.cs

@@ -114,7 +114,7 @@ protected override void ProcessRecordInternal()
 
                 parameters.Validate();
                 if (this.ShouldProcess(this.Name,
-                    string.Format("Creating Log Alert Rule '{0}' in resource group {0}", this.Name,
+                    string.Format("Creating Log Alert Rule '{0}' in resource group {1}", this.Name,
                         this.ResourceGroupName)))
                 {
 

src/Monitor/Monitor/ScheduledQueryRules/RemoveScheduledQueryRuleCommand.cs

@@ -85,7 +85,7 @@ protected override void ProcessRecordInternal()
             }
 
             if (this.ShouldProcess(this.Name,
-                string.Format("Deleting Log Alert Rule '{0}' in resource group {0}", this.Name,
+                string.Format("Deleting Log Alert Rule '{0}' in resource group {1}", this.Name,
                     this.ResourceGroupName)))
             {
                 try