Add additional details on metric source being k8s nodes
Add additional details on metric source being k8s nodes

stoplightio/gitlabhq,iiet/iiet-git,htve/GitlabForChinese,jirutka/gitlabhq,iiet/iiet-git,darkrasid/gitlabhq,t-zuehlsdorff/gitlabhq,mmkassem/gitlabhq,dreampet/gitlab,t-zuehlsdorff/gitlabhq,mmkassem/gitlabhq,darkrasid/gitlabhq,iiet/iiet-git,dplarson/gitlabhq,t-zuehlsdorff/gitlabhq,axilleas/gitlabhq,dplarson/gitlabhq,t-zuehlsdorff/gitlabhq,jirutka/gitlabhq,dreampet/gitlab,jirutka/gitlabhq,mmkassem/gitlabhq,mmkassem/gitlabhq,dreampet/gitlab,dreampet/gitlab,stoplightio/gitlabhq,axilleas/gitlabhq,htve/GitlabForChinese,jirutka/gitlabhq,htve/GitlabForChinese,axilleas/gitlabhq,axilleas/gitlabhq,stoplightio/gitlabhq,htve/GitlabForChinese,darkrasid/gitlabhq,darkrasid/gitlabhq,iiet/iiet-git,stoplightio/gitlabhq,dplarson/gitlabhq,dplarson/gitlabhq