There are still some dependencies that we need to make work to fully
deactivate the legacyImports in the future. I'll start opening PRs
against those other repositories.

Merged https://github.com/kubernetes-monitoring/kubernetes-mixin/pull/463 to remove duplicate entries for memory usage, however I'd like to move these changes to the Prometheus-Operator helm chart(https://github.com/helm/charts/pull/23024#issuecomment-661967101). I've regenerated the dashboards/alerts.

Includes prometheus-operator v0.35.1 which should fix the statefulset
crash loop issue #2950

Signed-off-by: Simon Pasquier <spasquie@redhat.com>

Generate manifests for fd5b77ca.

Pick up new alerts for unreachable nodes.