# WorkSpaces Pools metrics and dimensions
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**Important**  
The WorkSpaces Pools feature is not available in the Beijing and Ningxia Regions.

Amazon WorkSpaces sends the following WorkSpaces Pools metrics and dimension information to Amazon CloudWatch.

WorkSpaces Pools sends metrics to CloudWatch one time every minute. The `AWS/Workspaces` namespace includes the following metrics.

## Pools usage metrics
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| Metric | Description | 
| --- | --- | 
|  ActiveUserSessionCapacity  | The number of user sessions currently being used for streaming sessions.<br />Units: Count<br />Valid statistics: Average, Minimum, Maximum | 
| ActualUserSessionCapacity | The total number of pool sessions that are available for streaming or are currently streaming.<pre>ActualUserSessionCapacity = AvailableUserSessionCapacity + ActiveUserSessionCapacity</pre><br />Units: Count<br />Valid statistics: Average, Minimum, Maximum | 
|  AvailableUserSessionCapacity  | The number of idle pool sessions currently available for user streaming.<pre>AvailableUserSessionCapacity = ActualUserSessionCapacity - ActiveUserSessionCapacity</pre><br />Units: Count<br />Valid statistics: Average, Minimum, Maximum | 
|  PendingUserSessionCapacity  | The number of sessions being provisioned for your pool. Represents the additional number of streaming sessions the pool can support after provisioning is complete.<br />Units: Count<br />Valid statistics: Average, Minimum, Maximum | 
| UserSessionsCapacityUtilization | The percentage of sessions in a pool that are being used, using the following formula.<pre>UserSessionCapacityUtilization = (ActiveUserSessionCapacity / ActualUserSessionCapacity) * 100</pre><br />Monitoring this metric helps with decisions about increasing or decreasing the value of a pool's desired capacity.<br />Units: Percent<br />Valid statistics: Average, Minimum, Maximum | 
|  DesiredUserSessionCapacity  | The total number of sessions that are either running or pending. This represents the total number of concurrent streaming sessions your pool can support in a steady state.<pre>DesiredUserSessionCapacity = ActualUserSessionCapacity + PendingUserSessionCapacity</pre><br />Units: Count<br />Valid statistics: Average, Minimum, Maximum | 
|  InsufficientCapacityError  | The number of session requests rejected due to lack of capacity.<br />You can set alarms to use this metric to be notified of users waiting for streaming sessions.<br />Units: Count<br />Valid statistics: Average, Minimum, Maximum, Sum |