Method: Aws::CloudWatch::Types::MetricDataQuery#expression

Defined in:
lib/aws-sdk-cloudwatch/types.rb

#expression ⇒ String

This field can contain either a Metrics Insights query, or a metric math expression to be performed on the returned data. For more information about Metrics Insights queries, see [Metrics Insights query components and syntax] in the *Amazon CloudWatch User Guide*.

A math expression can use the ‘Id` of the other metrics or queries to refer to those metrics, and can also use the `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 *Amazon CloudWatch User Guide*.

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

[1]: docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring/cloudwatch-metrics-insights-querylanguage [2]: docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring/using-metric-math.html#metric-math-syntax

Returns:

  • (String) 


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# File 'lib/aws-sdk-cloudwatch/types.rb', line 2833

class MetricDataQuery < Struct.new(
  :id,
  :metric_stat,
  :expression,
  :label,
  :return_data,
  :period,
  :account_id)
  SENSITIVE = []
  include Aws::Structure
end