v3

• Matches all possibles disks drives. (#6, @Lord-Y)

v2

• Makes CPU and memory usage charts staircased.
• Removes io_kubernetes_ labels prefix usage for newer Prometheus versions.
• More clever file system device detection (for CoreOS
  mainly).

Dashboard created

• Total and used cluster resources: CPU, memory, filesystem.
  And total cluster network I/O pressure.
• Kubernetes pods usage:
  CPU, memory, network I/O.
• Containers usage: CPU, memory, network I/O.
  Docker and rkt containers
  which runs on cluster nodes but outside Kubernetes are also monitored.
• systemd system services
  usage: CPU, memory.
• Showing all above metrics both for all cluster and each node separately.