How to check the version of GitLab?

Question

How to check which version of GitLab is installed on the server?

I am about version specified in GitLab changelog:
https://gitlab.com/gitlab-org/gitlab-foss/b

Answer 1

It can be retrieved using REST, see Version API :

curl --header "PRIVATE-TOKEN: 9koXpg98eAheJpvBs5tK" https://gitlab.example.com/api/v4/version

For authentication see Personal access tokens documentation.