code: function done( error ) {
  				if ( error ) {
  					next( error );
  					return;
  				}
  				if ( !request.hasOwnProperty( 'locals' ) ) {
  					request.locals = {};
  				}
  				request.locals.monitor = metrics;
  				next();
  			}
docs: FUNCTION: done( [error] )
  Callback invoked once all plugins have reported back to the monitor.
  
  @private
  @param {Object} [error] - error object