public static PrometheusExpositionService of(PrometheusRegistry prometheusRegistry) {
        return builder(prometheusRegistry).build();
    }
Returns a new {@link PrometheusExpositionService} that exposes Prometheus metrics from
the specified {@link PrometheusRegistry}.
prometheus1/src/main/java/com/linecorp/armeria/server/prometheus/PrometheusExpositionService.java