*: Update to Prometheus 2.4.0

contrib/kube-prometheus: Set antiAffinity for Prometheus & Alertmanager

contrib/kube-prometheus: Generate new manifests with antiAffinity

contrib/kube-prometheus: jb update

Documentation: Generate after updating kube-prometheus manifests

contrib/kube-prometheus: Move antiaffinity into own jsonnet file

foobar

This is distributed as a library that the user is meant to import.
example:

```
kp =  (import 'kube-prometheus/kube-prometheus.libsonnet') +
      (import 'kube-prometheus/kube-prometheus-thanos.libsonnet') +
      {
        _config+:: {...}
      };
```

With those changes, diff does show any differences between generated manifests
with and without the version override in a top level jsonnet file.

kube-prometheus: Add Prometheus Operator alerts

contrib/.../alerts: improve alert messages

Only trigger disk running full alerts when the disk capacity is over 85%
and use recording rule of the kubernetes-mixin to only consider real
physical filesystems.

This bumps the kubernetes-mixin dependency to add
https://github.com/kubernetes-monitoring/kubernetes-mixin/pull/76.

Signed-off-by: Sergiusz Urbaniak <sergiusz.urbaniak@gmail.com>

Signed-off-by: Sergiusz Urbaniak <sergiusz.urbaniak@gmail.com>

Currently, we are mounting `/root` from the host as `/host/root`.
Instead simply `/` from the host should be mounted.

This fixes it

Signed-off-by: Sergiusz Urbaniak <sergiusz.urbaniak@gmail.com>