MetricDimension
A CloudWatch dimension, which is specified using a Key (known as a Name in CloudWatch), Value pair. By default, Amazon EMR uses one dimension whose Key is JobFlowID and Value is a variable representing the cluster ID, which is ${emr.clusterId}. This enables the rule to bootstrap when the cluster ID becomes available.
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See Also
For more information about using this API in one of the language-specific AWS SDKs, see the following:
