public static String getOnlineInstanceNodePath(final String instanceId, final InstanceType instanceType) {
        return String.join("/", "", ROOT_NODE, COMPUTE_NODE, ONLINE_NODE, instanceType.name().toLowerCase(), instanceId);
    }
@Test
    void assertGetOnlineInstanceNodePath() {
        assertThat(ComputeNode.getOnlineInstanceNodePath("foo_instance_1", InstanceType.PROXY), is("/nodes/compute_nodes/online/proxy/foo_instance_1"));
        assertThat(ComputeNode.getOnlineInstanceNodePath("foo_instance_2", InstanceType.JDBC), is("/nodes/compute_nodes/online/jdbc/foo_instance_2"));
    }