@java.lang.Override
      public int getPoolSize() {
        return poolSize_;
      }
<pre>
Optional. The number of VMs that the system should keep idle so that
new workstations can be started quickly for new users. Defaults to `0`
in the API.
</pre>

<code>int32 pool_size = 5 [(.google.api.field_behavior) = OPTIONAL];</code>

@return The poolSize.
java-workstations/proto-google-cloud-workstations-v1/src/main/java/com/google/cloud/workstations/v1/WorkstationConfig.java