# WorkSpaces Pools metrics and dimensions
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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. Units: Count 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> Units: Count Valid statistics: Average, Minimum, Maximum  | 
|  AvailableUserSessionCapacity  |  The number of idle pool sessions currently available for user streaming. <pre>AvailableUserSessionCapacity = ActualUserSessionCapacity - ActiveUserSessionCapacity</pre> Units: Count 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. Units: Count 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> Monitoring this metric helps with decisions about increasing or decreasing the value of a pool's desired capacity. Units: Percent 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> Units: Count Valid statistics: Average, Minimum, Maximum  | 
|  InsufficientCapacityError  |  The number of session requests rejected due to lack of capacity. You can set alarms to use this metric to be notified of users waiting for streaming sessions. Units: Count Valid statistics: Average, Minimum, Maximum, Sum  |