Adding an alarm from a different account to a CloudWatch cross-account dashboard
Sign in to the monitoring account.
Open the CloudWatch console at https://console.aws.amazon.com/cloudwatch/
. At the top of the page, choose the account where the alarm is located.
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In the navigation pane, choose Alarms.
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Select the check box next to the alarm that you want to add, and choose Add to dashboard.
Select the cross-account dashboard that you want to add it to, and choose Add to dashboard.