labelsQuery 0 . . 1 The value is an expression for the filtering of labels attribute of resource when it is of key - value pair format . The expression is about the relationship between label - key and label - value which may include equal to or not equal to , within or not within a specified set etc . For example , label - key equals to label value , or label - key within { label - value 1 , label - value 2 }. Details are defined in [ 3 ]