Joining two metrics

Hello Team,
I have been trying to join two metrics, But whenever I add an operator, I get no data. Could someone help me figure it out?

topk(5, stddev(container_memory_usage{k8s_cluster_name=“lab”}) by (k8s_container_name)) * on(k8s_node_name) group_left(support_level) k8s_cluster_metadata{}