private boolean isHealthy() {
        for (HealthChecker healthChecker : healthCheckers) {
            if (!healthChecker.isHealthy()) {
                return false;
            }
        }
        return true;
    }
Returns a new builder which builds a new {@link HealthCheckService}.
core/src/main/java/com/linecorp/armeria/server/healthcheck/HealthCheckService.java