There are defaults for cmdKesy = methodname and groupKey=classname.
If hytsrix cfg in application.yml is linked via this default names and method or class names get refactored the configuration is delinked without recognizing. Therefore explict labeling via custom commandKey and groupKey anotated above the Feign (interface) method would help to explicit link that and thre are no problems with code refactorings.

This is related to #189 (comment)