* Without the prometheus.io/port annotation, Prometheus
service discovery can scrape other Prometheus ports that
may be available.
* For example, Prometheus sidecars (not included) may
be scraped and that may be unintended
* Annotate Prometheus service to scrape metrics from
Prometheus itself (enables Prometheus* alerts)
* Update kube-state-metrics addon-resizer to 1.7
* Use port 8080 for kube-state-metrics
* Add PrometheusNotIngestingSamples alert rule
* Change K8SKubeletDown alert rule to fire when 10%
of kubelets are down, not 1%
* https://github.com/coreos/prometheus-operator/pull/1032