check_rancher2

Version 1.8.0 adds a lot of additional performance data to the plugin. The cluster and node performance data now show more information, including percentages of resources used (for example CPU used in percent). The plugin now also supports long parameters (-H and --apihost). Additional parameters were added to specifically trigger alerts when certain performance thresholds are reached on a node or cluster level: CPU Usage, Memory Usage or Pod Usage. Kudos and credits to @steffeneichler for this large PR!

Fix cluster status check (#26)

Version 1.7.0 adds additional internal checks to the -t node check. Prior to 1.7.0, only the node status was checked. This could either be Active, Unavailable, Drained or Cordoned (if I remember correctly). Release 1.7.0 adds additional checks on pressure conditions, such as Disk Pressure.