Add kube-monkey support to Auto DevOps

Problem to solve

#27089 (closed) will give us the ability to install kube-monkey with one click, however, all configuration and annotations must still be done manually.

Intended users

developers, operators

Further details

Proposal

If user has installed kube-monkey in their Kubernetes cluster, allow application to opt-in to chaos through the use of env variables which auto-deploy will use to annotate the user's app.

When user sets kube-monkey/enabled to enabled, we can use defaults for all other labels and use them if user does not specify them explicitly.

variable	value	default?	description
kube-monkey/enabled	enabled	no	sets kube-monkey/enabled value to enabled on user's deployment
kube-monkey/identifier	custom	yes	used to identify the pods that belong to a k8s app as Pods inherit labels from their k8s app
kube-monkey/mtbf	2	yes	Mean time between failure (in days)
kube-monkey/kill-mode	fixed	yes	Default behavior is for kube-monkey to kill only ONE pod of your app. You can override this behavior
kube-monkey/kill-value	1	yes	Specify value for kill-mode, if fixed provide an integer of pods to kill

Once user has enabled chaos, auto-deploy to annotate deployment with relevant values

---
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: monkey-victim
  namespace: app-namespace
spec:
  template:
    metadata:
      labels:
        kube-monkey/enabled: enabled
        kube-monkey/identifier: monkey-victim
        kube-monkey/mtbf: '2'
        kube-monkey/kill-mode: "fixed"
        kube-monkey/kill-value: '1'

See https://github.com/asobti/kube-monkey for further info

Permissions and Security

Documentation

Testing

What does success look like, and how can we measure that?

What is the type of buyer?

Links / references

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