I want to know why some versions display 9990 and others display 9991? this is namerd1.4.2 https://api.linkerd.io/1.4.2/namerd/index.html#introduction  this is namerd1.7.3 https://api.linkerd.io/1.7.3/namerd/index.html#introduction 
I want to know why some versions display 9990 and others display 9991?
this is namerd1.4.2
https://api.linkerd.io/1.4.2/namerd/index.html#introduction
this is namerd1.7.3
https://api.linkerd.io/1.7.3/namerd/index.html#introduction