"HTTP Request Durations" panel in grafana-operator-overview has"No data" because of $__interval

[nobuto-m]

Bug Description

grafana-k8s-operator/src/self_dashboard.json

Line 962 in 3a0706a

"expr": "histogram_quantile(0.95, sum(rate(grafana_http_request_duration_seconds_bucket{juju_charm=\"grafana-k8s\"}[$__interval])) by (le,handler))",

By changing the query to use $__rate_interval, it shows some data.

To Reproduce

1. juju deploy cos-lite --trust --channel latest/edge
2. open the grafana dashboard

Environment

App           Version  Status  Scale  Charm             Channel      Rev
alertmanager  0.27.0   active      1  alertmanager-k8s  latest/edge  107
catalogue              active      1  catalogue-k8s     latest/edge   34
grafana       9.5.3    active      1  grafana-k8s       latest/edge  109
loki          2.9.5    active      1  loki-k8s          latest/edge  128
prometheus    2.50.1   active      1  prometheus-k8s    latest/edge  174
traefik       v2.11.0  active      1  traefik-k8s       latest/edge  177

Relevant log output

N/A

Additional context

No response

[nobuto-m]

Upstream uses $__rate_interval fwiw.
https://github.com/grafana/grafana/blob/8f5839fe8ff5ae4e5f3f08f055fe8c788b8ed42c/grafana-mixin/dashboards/grafana-overview.json#L369-L391