MetricAutoObserver doesn't work when I register module using forRootAsync

[jurampark-pala]

Hi, thanks for making this amazing library.

It was working perfectly when I register module using the 'forRoot' but if I change to 'forRootAsync', it doesn't. Anyone knows the reason for this?

Here's the code I used.

OpenTelemetryModule.forRootAsync({
      imports: [],
      useFactory: () => ({
        applicationName: "helloworld",
        metricAutoObservers: [
          HttpRequestDurationSeconds.build({
            // unit is milliseconds, 0.1 seconds ~ 8 seconds.
            boundaries: [100, 300, 500, 1000, 2000, 4000, 8000],
          }),
          ActiveHandlesMetric,
        ],
        metricExporter: new PrometheusExporter({
          endpoint: "metrics",
          port: 9464,
        }),
        metricInterval: 1000,
      }),
    }),

Thanks in advance!