# MetricDimension
<a name="API_MetricDimension"></a>

The dimension of a metric.

## Contents
<a name="API_MetricDimension_Contents"></a>

 ** dimensionName **   <a name="iot-Type-MetricDimension-dimensionName"></a>
A unique identifier for the dimension.  
Type: String  
Length Constraints: Minimum length of 1. Maximum length of 128.  
Pattern: `[a-zA-Z0-9:_-]+`   
Required: Yes

 ** operator **   <a name="iot-Type-MetricDimension-operator"></a>
Defines how the `dimensionValues` of a dimension are interpreted. For example, for dimension type TOPIC\$1FILTER, the `IN` operator, a message will be counted only if its topic matches one of the topic filters. With `NOT_IN` operator, a message will be counted only if it doesn't match any of the topic filters. The operator is optional: if it's not provided (is `null`), it will be interpreted as `IN`.  
Type: String  
Valid Values: `IN | NOT_IN`   
Required: No

## See Also
<a name="API_MetricDimension_SeeAlso"></a>

For more information about using this API in one of the language-specific AWS SDKs, see the following:
+  [AWS SDK for C\$1\$1](https://docs.aws.amazon.com/goto/SdkForCpp/iot-2015-05-28/MetricDimension) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/iot-2015-05-28/MetricDimension) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/iot-2015-05-28/MetricDimension)