append(latency, errCode) {
		this.dirty = true;
		this.cycleCount++;
		this.count++;
		if (errCode) this.errors[errCode] = (this.errors[errCode] || 0) + 1;

		if (latency != null) this.lastTimeBucket.times.push(latency);
	}
@param {any} latency
@param {any} errCode

@memberof StatRequestStore