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.

Pick up new alerts for unreachable nodes.

* Bumping prometheus-adapter and Grafana versions

* Bumping prometheus-adapter version in libsonnet file

* Regenerating lockfile

* Bumping Grafana version in libsonnet file

* Updating kustomization.yaml

* Update Prometheus, Node Exporter & Grafana

* Update Prometheus to 2.10.0

* Add generated manifests

* Update lock reference to git sha

* Retrigger Travis