feat(cloudwatch): support cross-environment search expressions #16539
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Fixes #9039 (also some prior discussion on #9034)
Currently CDK gives no way to specify account or region on MathExpressions which means it is not possible to run search expressions against environments other than the deployment environment.
The CloudWatch console currently has this capability, however the documentation still states that
accountId
orregion
should only be used on metric widgets. I've left feedback to ask whether this documentation is out of date or whether it is an undocumented feature.This change adds in the
searchAccount
andsearchRegion
property which can be optionally specified for the Dashboards use case. When a MathExpression with a searchAccount or searchRegion set is attempted to be used within an Alarm, the change throws an error as Alarms do not support search expressions.By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license