How should I configure prometheus datasource in Gitlab's embedded Grafana

[mabihan]

Hi,

I'm using the Gitlab's embedded Grafana and I successfully installed gitlab-ci-pipelines-exporter, on the same server. The metrics are exposed on the port 8090.

root@gitlab-prod-01:~# curl 127.0.0.1:8090/metrics 2>&1 | grep gitlab_ci_pipeline | wc -l
15099

I don't know why, I cannot configure the datasource : I get a 404 error. Here are my datasource settings :

Name

Gitlab CI Pipeline Exporter

HTTP

URL : http://127.0.0.1:8090
Access : Server
Whitelisted Cookies :

Auth

...(none selected)
Scrape interval : 15s
Query timeout : 60s
HTTP Method : GET

How should I configure the datasource ? I do not understand this message.