public static PrometheusExpositionService of(CollectorRegistry collectorRegistry) {
        return new PrometheusExpositionService(collectorRegistry, Flags.transientServiceOptions());
    }
Returns a new {@link PrometheusExpositionService} that exposes Prometheus metrics from the specified
{@link CollectorRegistry}.
core/src/main/java/com/linecorp/armeria/server/metric/PrometheusExpositionService.java