Memory quota panel: memory limits % must include cache

[nanouck]

https://github.com/kubernetes-monitoring/kubernetes-mixin/blob/05a58f765eda05902d4f7dd22098a2b870f7ca1e/dashboards/resources/pod.libsonnet#L240

The cache usage is counted within the container’s cgroup, which can be restricted in size by the limit In our case the pod task has been OOM killed because WSS + cache is reaching the limit

https://community.ibm.com/community/user/aiops/blogs/riley-zimmerman/2021/07/02/memory-measurements-complexities-part2

-          'sum(container_memory_working_set_bytes{%(cadvisorSelector)s, %(clusterLabel)s="$cluster", namespace="$namespace", pod="$pod", container!="", image!=""}) by (container) / sum(cluster:namespace:pod_memory:active:kube_pod_container_resource_limits{%(clusterLabel)s="$cluster", namespace="$namespace", pod="$pod"}) by (container)' % $._config,
+          'sum(container_memory_working_set_bytes{%(cadvisorSelector)s, %(clusterLabel)s="$cluster", namespace="$namespace", pod="$pod", container!="", image!=""} + container_memory_cache{%(cadvisorSelector)s, %(clusterLabel)s="$cluster", namespace="$namespace", pod="$pod", container != "", container != "POD"}) by (container) / sum(cluster:namespace:pod_memory:active:kube_pod_container_resource_limits{%(clusterLabel)s="$cluster", namespace="$namespace", pod="$pod"}) by (container)' % $._config

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