Method putAttribute

packages/firebase-performance/common.ts:20–20

(attribute: string, value: string)

	getMetrics(): { [key: string]: number };
	incrementMetric(metricName: string, incrementBy: number): void;
	putAttribute(attribute: string, value: string): void;
	putMetric(metricName: string, value: number): void;
	removeMetric(metricName: string): void;
	start();