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)
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