Documentation

Represents a CloudWatch metric of your choosing for a target tracking scaling policy to use with Application Auto Scaling.

For information about the available metrics for a service, see Amazon Web Services services that publish CloudWatch metrics in the Amazon CloudWatch User Guide.

To create your customized metric specification:

• Add values for each required parameter from CloudWatch. You can use an existing metric, or a new metric that you create. To use your own metric, you must first publish the metric to CloudWatch. For more information, see Publish custom metrics in the Amazon CloudWatch User Guide.
• Choose a metric that changes proportionally with capacity. The value of the metric should increase or decrease in inverse proportion to the number of capacity units. That is, the value of the metric should decrease when capacity increases, and increase when capacity decreases.

For an example of how creating new metrics can be useful, see Scaling based on Amazon SQS in the Amazon EC2 Auto Scaling User Guide. This topic mentions Auto Scaling groups, but the same scenario for Amazon SQS can apply to the target tracking scaling policies that you create for a Spot Fleet by using the Application Auto Scaling API.

For more information about the CloudWatch terminology below, see Amazon CloudWatch concepts in the Amazon CloudWatch User Guide.

See: newCustomizedMetricSpecification smart constructor.

Create a value of CustomizedMetricSpecification with all optional fields omitted.

Use generic-lens or optics to modify other optional fields.

The following record fields are available, with the corresponding lenses provided for backwards compatibility:

$sel:dimensions:CustomizedMetricSpecification', customizedMetricSpecification_dimensions - The dimensions of the metric.

Conditional: If you published your metric with dimensions, you must specify the same dimensions in your scaling policy.

$sel:unit:CustomizedMetricSpecification', customizedMetricSpecification_unit - The unit of the metric. For a complete list of the units that CloudWatch supports, see the MetricDatum data type in the Amazon CloudWatch API Reference.

$sel:metricName:CustomizedMetricSpecification', customizedMetricSpecification_metricName - The name of the metric. To get the exact metric name, namespace, and dimensions, inspect the Metric object that is returned by a call to ListMetrics.

$sel:namespace:CustomizedMetricSpecification', customizedMetricSpecification_namespace - The namespace of the metric.

$sel:statistic:CustomizedMetricSpecification', customizedMetricSpecification_statistic - The statistic of the metric.

The dimensions of the metric.

Conditional: If you published your metric with dimensions, you must specify the same dimensions in your scaling policy.

The unit of the metric. For a complete list of the units that CloudWatch supports, see the MetricDatum data type in the Amazon CloudWatch API Reference.

The name of the metric. To get the exact metric name, namespace, and dimensions, inspect the Metric object that is returned by a call to ListMetrics.

The namespace of the metric.

The statistic of the metric.