interface IGauge extends IMetric Since 0.2.0 Gauge: arbitrary set / inc / dec. observe sets the value. Methods set(value: number,labels?: Readonly<Record<string, string>>): void Sets the gauge to a specific value. inc(value?: number,labels?: Readonly<Record<string, string>>): void Increments the gauge. dec(value?: number,labels?: Readonly<Record<string, string>>): void Decrements the gauge.