public Builder setPoolSize(int value) {

          poolSize_ = value;
          bitField0_ |= 0x00000010;
          onChanged();
          return this;
        }
<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>

@param value The poolSize to set.
@return This builder for chaining.
java-workstations/proto-google-cloud-workstations-v1beta/src/main/java/com/google/cloud/workstations/v1beta/WorkstationConfig.java