append(actionName, latency, errCode) {
		this.total.append(latency, errCode);

		if (actionName) {
			if (!this.actions.has(actionName))
				this.actions.set(
					actionName,
					new StatRequestStore(actionName, this.options.bucketCount)
				);
			this.actions.get(actionName).append(latency, errCode);
		}
	}
@param {any} actionName
@param {any} latency
@param {any} errCode

@memberof RequestStatistics