Configure Datasource returns error

[JustNZ]

Hello,

After installing the plugin and configuring the datasource I get the following red error message:

My Datasource Details:

[github-amine-kherbouche]

same here 👋

[gaetanars]

You use Grafana Mimir Alertmanager, not Prometheus Alertmanager. Same issue for me.

[forsberg]

Same for me on Grafana 11. Looks like it's making a request to Grafana itself (see <title>Grafana</title> in the output).

Not using mimir.

[forsberg]

I have a hard time believing this, but what solved this problem for me was to not name my datasource of type camptocamp-prometheus-alertmanager-datasource "alertmanager".

In my case, URL was set to http://kube-prometheus-stack-alertmanager.monitoring.svc.cluster.local:9093/alertmanager/

If my datasource was named "alertmanager", I would see a request in the request log of grafana itself where it received a request for /alertmanager, i.e, it seems like for some reason, the http request was not routed to my actual alertmanager, but to grafana. If I instead name my datasource "camptocamp-prometheus-alertmanager-datasource", it starts working.

This seems to appeared somewhere between Grafana 9.0.5 and Grafana 11.0.0.

Oddly enough, this was only a problem on one of my Grafana instances.