Gitlab KAS doesn't need to be enabled to start
Gitlab "omnibus" (on-prem) CE, 15.11 (and probably before)
If your gitlab.rb does not contain a line about gitlab_kas['enable']
It seems to default for KAS is to START ( enable = true ) which is unexpected in the sense the doc says to activate it manually by gitlab_kas['enable'] = true
In short, the default seems to be true. So either the DOC should be changed or the default should be bugfixed to "false" not true.
Also, if you upgrade (eg from 14.X) your instance, KAS will auto-start for the same reason.
Edited by Cedric Dotnet