AWS::IoTSiteWise::AssetModel Metric

Contains an asset metric property. With metrics, you can calculate aggregate functions, such as an average, maximum, or minimum, as specified through an expression. A metric maps several values to a single value (such as a sum).

The maximum number of dependent/cascading variables used in any one metric calculation is 10. Therefore, a root metric can have up to 10 cascading metrics in its computational dependency tree. Additionally, a metric can only have a data type of DOUBLE and consume properties with data types of INTEGER or DOUBLE.

For more information, see Metrics in the AWS IoT SiteWise User Guide.

Syntax

To declare this entity in your AWS CloudFormation template, use the following syntax:

JSON

{
  "Expression" : String,
  "Variables" : [ ExpressionVariable, ... ],
  "Window" : MetricWindow
}

YAML

  Expression: String
  Variables: 
    - ExpressionVariable
  Window: 
    MetricWindow

Properties

Expression

The mathematical expression that defines the metric aggregation function. You can specify up to 10 variables per expression. You can specify up to 10 functions per expression.

For more information, see Quotas in the AWS IoT SiteWise User Guide.

Required: Yes

Type: String

Update requires: No interruption

Variables

The list of variables used in the expression.

Required: Yes

Type: Array of ExpressionVariable

Update requires: No interruption

Window

The window (time interval) over which AWS IoT SiteWise computes the metric's aggregation expression. AWS IoT SiteWise computes one data point per window.

Required: Yes

Type: MetricWindow

Update requires: No interruption