GetLabels return labels that identifies given application additional labels are used only when creating object if you are creating something use additional=true if you need labels to filter component then use additional=false.

GetNonOdoSelector are supposed to be used for selection of any resource part of an application that is not managed by odo.

GetSelector are supposed to be used for selection of any resource part of an application that is managed by odo.

App is the default name used when labeling.

ApplicationLabel is label key that is used to group all object that belong to one application It should be save to use just this label to filter application.

ManagedBy notes that this is managed by odo.

ManagerVersion is a Kubernetes label that adds what version of odo is being ran.