[Feature Request]: Gauge metrics in stackdriver

### What happened?

Java Beam version: 2.39.0

The following code doenst seem to work.

- There are no error messages reported in the logs as well.
- There are no quota issues
- This code is used in DataFlow pipeline

Code sample:

private final Gauge numSuccessfulApiRequests = Metrics.gauge(MyClass.class, "num_successful_api_requests");
log.info("MyClass, setting gauge metric");
numSuccessfulApiRequests.set(1);

### Issue Priority

Priority: 1

### Issue Component

Component: beam-community