Decrease value of limit before "Namespace quota is going to be full.

[PG2000]

Hello,

as some experience of day to day problems with resource quotas it think it would make sense to decrease the default value to 0.75. for the warning alert.

kube-prometheus/manifests/kubernetes-prometheusRule.yaml

Line 306 in 408f386

> 0.9 < 1

I often was informed by a team or user when this happens after they tried to restart an deployment, statefulset etc. and the alert has not be thrown as the limit was to high.

Same here:

kube-prometheus/manifests/kubernetes-prometheusRule.yaml

Line 319 in 408f386

== 1

Could this ever happen that it will be exactly 1

So, what is your experience with this? If this makes sense i could provide a PR.