revert: rollback prom metrics container_env changes.

Signed-off-by: colstuwjx <colstuwjx@gmail.com>

metrics/prometheus.go

@@ -1836,7 +1836,7 @@ func DefaultContainerLabels(container *info.ContainerInfo) map[string]string {
 }
 
 // BaseContainerLabels returns a ContainerLabelsFunc that exports the container
-// name, first alias, image name as well as all its env and white listed label values.
+// name, first alias, image name as well as white listed label values.
 func BaseContainerLabels(whiteList []string) func(container *info.ContainerInfo) map[string]string {
 	whiteListMap := make(map[string]struct{}, len(whiteList))
 	for _, k := range whiteList {
@@ -1856,9 +1856,6 @@ func BaseContainerLabels(whiteList []string) func(container *info.ContainerInfo)
 				set[ContainerLabelPrefix+k] = v
 			}
 		}
-		for k, v := range container.Spec.Envs {
-			set[ContainerEnvPrefix+k] = v
-		}
 		return set
 	}
 }