Grafana dashboard: Kubernetes Cluster
Description: Cluster level overview of workloads deployed, based on prometheus metrics exposed by kubelet, node-exporter, nginx ingress controller

Shows basic stuff about 
- cluster health (pod status count, pod restarts etc.)
- cluster nodes (cpu, memory, storage etc.)
- running pods (cpu, memory etc.)
- nginx ingress controller (connections, resp time)

intended for a starting point for looking at and debugging cluster health / performance

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