/**
* Register the MetricsPlugin with the RestExpress server.
*
* @param server a RestExpress server instance.
* @return MetricsPlugin
*/
@Override
public MetricsPlugin register(RestExpress server) {
if (isRegistered) return this;
server.registerPlugin(this);
this.isRegistered = true;
server.addMessageObserver(this).addPreprocessor(this).addPostprocessor(this);
return this;
}
