change alarm metric for DLQ

Author: devksingh4

cloudformation/main.yml

@@ -558,11 +558,11 @@ Resources:
       AlarmDescription: "Items are present in the application DLQ, meaning some messages failed to process."
       Namespace: "AWS/SQS"
       MetricName: "ApproximateNumberOfMessagesVisible"
-      Statistic: "Sum"
-      Period: "60"
-      EvaluationPeriods: "1"
+      Statistic: "Maximum"
+      Period: 60
+      EvaluationPeriods: 1
       ComparisonOperator: "GreaterThanThreshold"
-      Threshold: "0"
+      Threshold: 0
       AlarmActions:
         - !Ref AlertSNSArn