Source of CloudWatch metrics
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In the AWS accounts I am supporting I have a number of custom CloudWatch metrics that I'm unable to identify how they are being populated, i.e. where the source of the put-metric-data is coming from. How can I identify the user/service/resource that is posting data to CloudWatch?
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Given the name CloudTrailMetrics, I assume that metrics are registered from CloudTrail logs sent to CloudWatch Logs using a metric filter.
https://docs.aws.amazon.com/awscloudtrail/latest/userguide/cloudwatch-alarms-for-cloudtrail.html
Many thanks shibata, I am definitely a step closer to understand how this CloudWatch alarm works; and I've learnt something new about metric filter. Much appreciate it.