Added troubleshooting section to "Group-level Kubernetes clusters"
Added troubleshooting section to "Group-level Kubernetes clusters"

mmkassem/gitlabhq,stoplightio/gitlabhq,stoplightio/gitlabhq,mmkassem/gitlabhq,stoplightio/gitlabhq,mmkassem/gitlabhq,stoplightio/gitlabhq,mmkassem/gitlabhq