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Fun fact: if you fuck up the only entry in .ssh/config you get some very confusing behaviour

$ cat .ssh/config
Hostname gitlabssh.home
IdentityFile ~/.ssh/gitlab.key

What would you expect this to do?

ssh myserver.example.com

It'll open a SSH session to gitlabssh.home.

That first line should be

Host gitlabssh.home

The directive HostName is valid, but overrides the destination connection name. With no "Host" before it, it applies globally.

That was mildly confusing few minutes.