Prometheus: make chart range configurable.

[feym78]

Hi!
Noticed that time range for prometheus chart is hardcoded as 10 minutes - https://github.com/headlamp-k8s/plugins/blob/main/prometheus/src/chart.tsx#L45
Is it possible to make it configurable in grafana style?

At least for wider time range like 1-60 minutes. May be free choice of range or predefined, like 10, 20, 30, 40, 50, 60.. etc minutes.
Ten minutes looks too small for debug purposes.
Thanks.

[feym78]

Hi!
Noticed that in the new version of prometheus plugin now there is setting for default timespan. Great job, this is really a big improvement!
Is it possible to make the similar dropdown in recourse-level view? Like change it in a pod and etc page granularly.