private void finalizeObservation(
      FeignContext feignContext, Observation observation, Throwable ex, Response response) {
    feignContext.setResponse(response);
    if (ex != null) {
      observation.error(ex);
    }
    observation.stop();
  }
Wrap feign {@link Client} with metrics.
micrometer/src/main/java/feign/micrometer/MicrometerObservationCapability.java