Amazon CloudWatch
User Guide

Monitoring CloudWatch Usage

CloudWatch collects metrics that track the usage of some AWS resources. These metrics correspond to AWS service limits. Tracking these metrics can help you make sure your use of AWS stays within your service limits.

Currently, the only metric in this namespace that CloudWatch uses is CallCount. This metric is published with the dimensions Resource, Service, and Type. The Resource dimension specifies the name of the API operation being tracked. For example, the CallCount metric with the dimensions "Service": "CloudWatch", "Type": "API" and "Resource": "PutMetricData" indicates the number of times the CloudWatch PutMetricData API operation has been called in your account.

Account-level usage metrics for supported AWS resources are in the AWS/Usage namespace and are collected every minute.

The CallCount metric does not have a specified unit. The most useful statistic for the metric is SUM, which represents the total operation count for the 1-minute period.


Metric Description


The number of specified operations performed in your account.


Dimension Description


The name of the API operation. Valid values include the following:

DeleteAlarms, DeleteDashboards, DescribeAlarmHistory, DescribeAlarms, GetDashboard, GetMetricData, GetMetricStatistics, ListMetrics, PutDashboard, and PutMetricData


The name of the AWS service containing the resource.


The type of resource being tracked. Currently, the only valid value is API.


The class of resource being tracked. CloudWatch API usage metrics use this dimension with a value of None.