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The Create composite alarm button enables when you select alarms from the All alarms list. That is because a composite alarm's purpose is to monitor and aggregate state of other alarms, so you need to first pick which alarms to aggregate.
There is no dependency on alarms in the source account. You can create alarms in the monitoring account on metrics in the source accounts at will, and then aggregate them in composite alarms in the monitoring account.
It is not possible to make a composite alarm in the monitoring account checking alarm state of alarms in source accounts.
回答済み 1年前
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AWS公式更新しました 1年前
The part I was looking for in your answer was this "You can create alarms in the monitoring account on metrics in the source accounts at will, and then aggregate them in composite alarms in the monitoring account". Following the AWS documentation to setup cross-account for Cloudwatch is not allowing such action. I can't create alarms and I can't create composite alarms, from the monitoring account.