Addede function to reset metrics

src/index.ts

@@ -141,5 +141,9 @@ export class Metrics {
     res.status(200)
     res.end(this._client.register.metrics())
   }
+
+  public resetMetrics = (): void => {
+    this._client.register.resetMetrics()
+  }
 }
 export default Metrics