prometheus notes

label_join(sum by (namespace, pod_name) (container_memory_usage_bytes{job="kubelet", pod_name!="", image!=""}), "pod", "", "pod_name") 

[Prometheus-PQL](https://www.jianshu.com/p/9cac39b94e9d)

[Prometheus学习系列（二十一）之PromQL函数](https://www.jianshu.com/p/f77047fd8dca)

[prometheus.(4).函数计算公式](https://www.cnblogs.com/orange-lsc/p/12825562.html#by)