The avatar url in the graph page goes to 404 when it combines with the relative path configuration

I’m not sure that I’m posting this on the right page, but there is a small issue in the gitlab-ce.

I’m in the v15.9.4(gitlab-ce-15.9.4), and the avatar url in the graph page goes to 404 when it combines with the relative path configuration.

image

For example:

in gitlab.rb: (omnibus install)
external_url ‘https://exa.example.com/gitlab
gitlab_rails[‘gravatar_ssl_url’] = “https://seccdn.libravatar.org/avatar/%{hash}?s=%{size}&d=identicon

Then the image’s url in the image goes to

https://exa.example.com/gitlabhttps://seccdn.libravatar.org/avatar/%{hash}?s=%{size}&d=identicon

and definitely, this url goes to 404 error.

I think there is another url configuration that I should change for this, but I can’t find any information about this.

Where should I change for this issue? Is this an unreported issue?