Merge branch 'docs-add-runbooks' into 'master'

docs add first draft for runbook topic

See merge request gitlab-org/gitlab-ce!22588

doc/README.md

@@ -165,6 +165,7 @@ configuration. Then customize everything from buildpacks to CI/CD.
 - [Deployment of Helm, Ingress, and Prometheus on Kubernetes](user/project/clusters/index.md#installing-applications)
 - [Protected variables](ci/variables/README.md#protected-variables)
 - [Easy creation of Kubernetes clusters on GKE](user/project/clusters/index.md#adding-and-creating-a-new-gke-cluster-via-gitlab)
+- [Executable Runbooks](user/project/clusters/runbooks/index.md)
 
 ### Monitor
 

doc/user/project/clusters/runbooks/index.md

+# Runbooks
+
+Runbooks are a collection of documented procedures that explain how to 
+carry out a particular process, be it starting, stopping, debugging, 
+or troubleshooting a particular system.
+
+## Overview
+
+Historically, runbooks took the form of a decision tree or a detailed 
+step-by-step guide depending on the condition or system. 
+
+Modern implementations have introduced the concept of an "executable 
+runbooks", where along with a well define process, operators can execute 
+code blocks or database queries against a given environment.
+
+## Nurtch Executable Runbooks
+
+> [Introduced](https://gitlab.com/gitlab-org/gitlab-ce/issues/45912) in GitLab 11.4.
+
+The JupyterHub app offered via GitLab’s Kubernetes integration now ships 
+with Nurtch’s Rubix library, providing a simple way to create DevOps 
+runbooks. A sample runbook is provided, showcasing common operations.
+
+**<i class="fa fa-youtube-play youtube" aria-hidden="true"></i>
+Watch this [video](https://www.youtube.com/watch?v=Q_OqHIIUPjE)
+for an overview of how this is acomplished in GitLab!**
+
+## Requirements
+
+To create an executable runbook, you will need:
+
+1. **Kubernetes** - A Kubernetes cluster is required to deploy the rest of the applications. 
+    The simplest way to get started is to add a cluster using [GitLab's GKE integration](https://docs.gitlab.com/ee/user/project/clusters/#adding-and-creating-a-new-gke-cluster-via-gitlab).
+1. **Helm Tiller** - Helm is a package manager for Kubernetes and is required to install 
+    all the other applications. It is installed in its own pod inside the cluster which 
+    can run the helm CLI in a safe environment.
+1. **Ingress** - Ingress can provide load balancing, SSL termination, and name-based 
+    virtual hosting. It acts as a web proxy for your applications.
+1. **JupyterHub** - JupyterHub is a multi-user service for managing notebooks across 
+    a team. Jupyter Notebooks provide a web-based interactive programming environment 
+    used for data analysis, visualization, and machine learning.
+
+## Nurtch
+
+Nurtch is the company behind the [Rubix library](https://github.com/Nurtch/rubix). Rubix is 
+an open-source python library that makes it easy to perform common DevOps tasks inside Jupyter Notebooks. 
+Tasks such as plotting Cloudwatch metrics and rolling your ECS/Kubernetes app are simplified 
+down to a couple of lines of code. Check the [Nurtch Documentation](http://docs.nurtch.com/en/latest) 
+for more information.