code: function checkThreshold(item, ctx) {
  		if (item.count >= item.opts.minRequestCount) {
  			const rate = item.failures / item.count;
  			if (rate >= item.opts.threshold)
  				trip(item, ctx);
  		}
  	}
docs: Check circuit-breaker failure threshold of Endpoint
  
  @param {Object} item
  @param {Context} ctx