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Hello,
CloudWatch works as push based service, and not as a poll service. By this I mean that CloudWatch itself does not pull any datapoint from the service, its the service which push the datapoints to CloudWatch - https://docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring/cloudwatch_architecture.html
Check that particular alarm metric's datapoint and see if that alarm is working fine as per the datapoint received from SWF workflow. If your alarm is in correct state based on the datapoint it received, check on SWF service that why it is not sending correct metric information.
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