Scaling
The metric data to return. Also defines whether this call is returning data for one metric only, or whether it is performing a math expression on the values of returned metric statistics to create a new time series. A time series is a series of data points, each of which is associated with a timestamp. You can call for a single metric or perform math expressions on multiple metrics. Any expressions used in a metric specification must eventually return a single time series. For more information and examples, see Create a target tracking scaling policy for Application Auto Scaling using metric math in the Application Auto Scaling User Guide. `TargetTrackingMetricDataQuery` is a property of the AWS::ApplicationAutoScaling::ScalingPolicy CustomizedMetricSpecification property type.
Constructors
Properties
The math expression to perform on the returned data, if this object is performing a math expression. This expression can use the `Id` of the other metrics to refer to those metrics, and can also use the `Id` of other expressions to use the result of those expressions. Conditional: Within each `TargetTrackingMetricDataQuery` object, you must specify either `Expression` or `MetricStat`, but not both.
A short name that identifies the object's results in the response. This name must be unique among all `MetricDataQuery` objects specified for a single scaling policy. If you are performing math expressions on this set of data, this name represents that data and can serve as a variable in the mathematical expression. The valid characters are letters, numbers, and underscores. The first character must be a lowercase letter.
Information about the metric data to return. Conditional: Within each `MetricDataQuery` object, you must specify either `Expression` or `MetricStat`, but not both.
Indicates whether to return the timestamps and raw data values of this metric. If you use any math expressions, specify `true` for this value for only the final math expression that the metric specification is based on. You must specify `false` for `ReturnData` for all the other metrics and expressions used in the metric specification. If you are only retrieving metrics and not performing any math expressions, do not specify anything for `ReturnData`. This sets it to its default (`true`).