Update Kubernetes from v1.15.3 to v1.16.0 #543
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* Drop `node-role.kubernetes.io/master` and `node-role.kubernetes.io/node` node labels * Kubelet (v1.16) now rejects the node labels used in the kubectl get nodes ROLES output * kubernetes/kubernetes#75457
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* Prometheus was configured to use kubernetes discovery of etcd targets based on nodes matching the node label node-role.kubernetes.io/controller=true * Kubernetes v1.16 stopped permitting node role labels node-role.kubernetes.io/* so Typhoon renamed these labels (no longer any association with roles) to node.kubermetes.io/controller=true * As a result, Prometheus didn't discover etcd targets, etcd metrics were missing, etcd alerts were ineffective, and the etcd Grafana dashboard was empty * Introduced: #543
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* Prometheus was configured to use kubernetes discovery of etcd targets based on nodes matching the node label node-role.kubernetes.io/controller=true * Kubernetes v1.16 stopped permitting node role labels node-role.kubernetes.io/* so Typhoon renamed these labels (no longer any association with roles) to node.kubermetes.io/controller=true * As a result, Prometheus didn't discover etcd targets, etcd metrics were missing, etcd alerts were ineffective, and the etcd Grafana dashboard was empty * Introduced: #543
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node-role.kubernetes.io/masterandnode-role.kubernetes.io/nodenode labelskubectl get nodesroles output