Merge pull request #774 from brancz/update-rules

assets/prometheus/rules/alertmanager.rules.yaml

assets/prometheus/rules/general.rules.yaml

assets/prometheus/rules/kube-apiserver.rules.yaml

assets/prometheus/rules/kube-controller-manager.rules.yaml

assets/prometheus/rules/kube-scheduler.rules.yaml

assets/prometheus/rules/kube-state-metrics.rules.yaml

assets/prometheus/rules/kubelet.rules.yaml

assets/prometheus/rules/kubernetes.rules.yaml

assets/prometheus/rules/node.rules.yaml

assets/prometheus/rules/prometheus.rules.yaml

manifests/prometheus/prometheus-k8s-rules.yaml