Loki and grafana metrics

i’m trying to configure our internal grafana server to read the metrics endpoints for grafana itself (v9.5.8 listening on port 3000) and loki (v2.8.4 listening on 3100).

curl’ing http://localhost:3000/metrics and http://localhost:3100/metrics i see the appropriate metrics for each. in grafana, when i configure a prometheus data source and either of those endpoints, i get a green checkmark with “data source is working”. however, when i explore either datasource and select the metric dropdown, loki flashes a yellow 404 message and the dropdown says “no options found”. the grafana prometheus data source doesn’t flash the 404 message, but still says “no options found”.

is there something else i need to do to get these configurations to work?