*: cut v0.1

Use prebuilt container with jsonnet in it

Note prometheus adapter component

Fixes Grafana config in ingress example

Per coreos/prometheus-operator#2519

Pin kubernetes-mixin v0.1.0

Update am to v0.17.0

Update kubespray libsonnet for kubespray v2.9.0

These changes have been tested against kubespray v2.9.0 on a baremetal
cluster created from scratch. They have not been tested against previous
versions of kubespray.

Fixes:

https://github.com/coreos/kube-prometheus/issues/79

alerts: Replace ntp with timex metrics

A local ntp server is optional, while timex is in kernel and always
present. Some ntp daemons like chrony can also only be run in a client
mode, which synchronizes the kernel but doesn't expose an ntp server.
Using the timex metrics is a more reliable approach.

jsonnet/prometheus-adapter: add metrics to default user-facing roles

Currently, only cluster wide admins have the permissions to view
metrics resources. This fixes it by adding a read-only cluster role
which includes aggregation labels to synthesize permission rules for
standard user-facing roles according to [1].

Note that only the "pods" resource is granted as reading "nodes"
metrics requires a cluster wide permission.

[1] https://kubernetes.io/docs/reference/access-authn-authz/rbac/#user-facing-roles

Update GitHub issue templates

Link fixes

README fixes, Dockerfile bump

update README.md

Update to Alertmanager v0.16.2