Merge branch 'docs-update-doc-for-prometheus-and-kubernetes-integrations' into 'master'

Updates documentation for Prometheus and Kubernetes integration

Closes #41432

See merge request gitlab-org/gitlab-ce!16156

doc/user/project/clusters/index.md

@@ -83,6 +83,7 @@ added directly to your configured cluster. Those applications are needed for
 | ----------- | :------------: | ----------- |
 | [Helm Tiller](https://docs.helm.sh/) | 10.2+ | Helm is a package manager for Kubernetes and is required to install all the other applications. It will be automatically installed as a dependency when you try to install a different app. It is installed in its own pod inside the cluster which can run the `helm` CLI in a safe environment. |
 | [Ingress](https://kubernetes.io/docs/concepts/services-networking/ingress/) | 10.2+ | Ingress can provide load balancing, SSL termination, and name-based virtual hosting. It acts as a web proxy for your applications and is useful if you want to use [Auto DevOps](../../../topics/autodevops/index.md) or deploy your own web apps. |
+| [Prometheus](https://prometheus.io/docs/introduction/overview/) | 10.4+ | Prometheus is an open-source monitoring and alerting system useful to supervise your deployed applications |
 
 ## Enabling or disabling the Cluster integration
 

doc/user/project/integrations/kubernetes.md

 ---
-last_updated: 2017-09-25
+last_updated: 2017-12-28
 ---
 
+CAUTION: **Warning:**
+Kubernetes service integration has been deprecated on GitLab 10.4. Fields on Kubernetes integration page are now uneditable, you can configure your clusters using the new [Clusters](../clusters/index.md) page.
+
 # GitLab Kubernetes / OpenShift integration
 
 GitLab can be configured to interact with Kubernetes, or other systems using the

doc/user/project/integrations/project_services.md

@@ -39,7 +39,7 @@ Click on the service links to see further configuration instructions and details
 | [Irker (IRC gateway)](irker.md) | Send IRC messages, on update, to a list of recipients through an Irker gateway |
 | [JIRA](jira.md) | JIRA issue tracker |
 | JetBrains TeamCity CI | A continuous integration and build server |
-| [Kubernetes](kubernetes.md) | A containerized deployment service |
+| [Kubernetes](kubernetes.md) _(Has been deprecated in GitLab 10.4)_ | A containerized deployment service |
 | [Mattermost slash commands](mattermost_slash_commands.md) | Mattermost chat and ChatOps slash commands |
 | [Mattermost Notifications](mattermost.md) | Receive event notifications in Mattermost |
 | [Microsoft teams](microsoft_teams.md) |  Receive notifications for actions that happen on GitLab into a room on Microsoft Teams using Office 365 Connectors |