This class represents one of two things:

Arguments in a call to a service

Use the attributes of this class as arguments to methods. You shouldn't make instances of this class. Each attribute should be used as a named argument in the calls that expect this type of object.

As an example, if Att1 is expected to be a Paws::CloudWatch::MetricDataQuery object:

  $service_obj->Method(Att1 => { Expression => $value, ..., ReturnData => $value  });

Results returned from an API call

Use accessors for each attribute. If Att1 is expected to be an Paws::CloudWatch::MetricDataQuery object:

  $result = $service_obj->Method(...);


This structure is used in both GetMetricData and PutMetricAlarm. The supported use of this structure is different for those two operations.

When used in GetMetricData, it indicates the metric data to return, and whether this call is just retrieving a batch set of data for one metric, or is performing a math expression on metric data. A single GetMetricData call can include up to 100 MetricDataQuery structures.

When used in PutMetricAlarm, it enables you to create an alarm based on a metric math expression. Each MetricDataQuery in the array specifies either a metric to retrieve, or a math expression to be performed on retrieved metrics. A single PutMetricAlarm call can include up to 20 MetricDataQuery structures in the array. The 20 structures can include as many as 10 structures that contain a MetricStat parameter to retrieve a metric, and as many as 10 structures that contain the Expression parameter to perform a math expression. Of those Expression structures, one must have True as the value for ReturnData. The result of this expression is the value the alarm watches.

Any expression used in a PutMetricAlarm operation must return a single time series. For more information, see Metric Math Syntax and Functions ( in the Amazon CloudWatch User Guide.

Some of the parameters of this structure also have different uses whether you are using this structure in a GetMetricData operation or a PutMetricAlarm operation. These differences are explained in the following parameter list.


Expression => Str

  The math expression to be performed on the returned data, if this
object is performing a math expression. This expression can use the
C<Id> of the other metrics to refer to those metrics, and can also use
the C<Id> of other expressions to use the result of those expressions.
For more information about metric math expressions, see Metric Math
Syntax and Functions
in the I<Amazon CloudWatch User Guide>.

Within each MetricDataQuery object, you must specify either Expression or MetricStat but not both.


  A short name used to tie this object to the results in the response.
This name must be unique within a single call to C<GetMetricData>. 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 underscore.
The first character must be a lowercase letter.

Label => Str

  A human-readable label for this metric or expression. This is
especially useful if this is an expression, so that you know what the
value represents. If the metric or expression is shown in a CloudWatch
dashboard widget, the label is shown. If Label is omitted, CloudWatch
generates a default.

MetricStat => Paws::CloudWatch::MetricStat

  The metric to be returned, along with statistics, period, and units.
Use this parameter only if this object is retrieving a metric and not
performing a math expression on returned data.

Within one MetricDataQuery object, you must specify either Expression or MetricStat but not both.

ReturnData => Bool

  When used in C<GetMetricData>, this option indicates whether to return
the timestamps and raw data values of this metric. If you are
performing this call just to do math expressions and do not also need
the raw data returned, you can specify C<False>. If you omit this, the
default of C<True> is used.

When used in PutMetricAlarm, specify True for the one expression result to use as the alarm. For all other metrics and expressions in the same PutMetricAlarm operation, specify ReturnData as False.


This class forms part of Paws, describing an object used in Paws::CloudWatch


The source code is located here:

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