code: function success(item, ctx) {
  		item.count++;
  
  		if (item.state === C.CIRCUIT_HALF_OPEN_WAIT)
  			circuitClose(item, ctx);
  		else
  			checkThreshold(item, ctx);
  	}
docs: Increment request counter and switch CB to CLOSE if it is on HALF_OPEN_WAIT.
  
  @param {Object} item
  @param {Context} ctx