Improve Prometheus rules and alerts and Grafana dashboards

* Collate upstream rules, alerts, and dashboards and tune for use
in Typhoon
* Previously, a well-chosen (but older) set of rules, alerts, and
dashboards were maintained to reflect metric name changes

CHANGES.md

@@ -13,15 +13,16 @@ Notable changes between versions.
 
 #### Addons
 
-* Raise nginx-ingress liveness/readiness timeout to 5 seconds
-* Remove nginx-ingess default-backend ([#401](https://github.com/poseidon/typhoon/pull/401))
-  * nginx-ingress now responds with its own 404 page by default
-* Improve Prometheus metrics labels and drop extraneous metrics ([#397](https://github.com/poseidon/typhoon/pull/397))
+* Improve Prometheus rules and alerts ([#404](https://github.com/poseidon/typhoon/pull/404))
+  * Drop extraneous metrics ([#397](https://github.com/poseidon/typhoon/pull/397))
   * Add `pod` name label to metrics discovered via service endpoints
   * Rename `kubernetes_namespace` label to `namespace`
-* Revamp the Grafana addon ([#403](https://github.com/poseidon/typhoon/pull/403))
+* Improve Grafana and dashboards ([#403](https://github.com/poseidon/typhoon/pull/403), [#404](https://github.com/poseidon/typhoon/pull/404))
   * Upgrade Grafana from v5.4.3 to 6.0.0-beta2
   * Enable Grafana [Explore](http://docs.grafana.org/guides/whats-new-in-v6-0/#explore) UI as a Viewer (inspect/edit without saving)
+* Raise nginx-ingress liveness/readiness timeout to 5 seconds
+* Remove nginx-ingess default-backend ([#401](https://github.com/poseidon/typhoon/pull/401))
+  * nginx-ingress now responds with its own 404 page by default
 
 ## v1.13.3