Clean up Kubernetes integration docs page

doc/user/project/integrations/kubernetes.md

@@ -96,10 +96,8 @@ the need to leave GitLab.
 
 ### Kubernetes monitoring
 
-GitLab has support for automatically detecting and monitoring Kubernetes metrics.
-Kubernetes exposes Node level metrics out of the box via the built-in
-[Prometheus metrics support in cAdvisor](https://github.com/google/cadvisor).
-No additional services or exporters are needed.
+Automatically detect and monitor Kubernetes metrics. Automatic monitoring of
+NGINX ingress is also supported.
 
 [> Read more about Kubernetes monitoring](./prometheus_library/kubernetes.md)
 
@@ -118,7 +116,7 @@ with no configuration, including: **Auto Build**, **Auto Test**, **Auto Code Qua
 
 NOTE: **Note:**
 Introduced in GitLab 8.15. You must be the project owner or have `master` permissions
-to use terminals. Support is currently limited to the first container in the
+to use terminals. Support is limited to the first container in the
 first pod of your environment.
 
 When enabled, the Kubernetes service adds [web terminal](../../../ci/environments.md#web-terminals)

doc/user/project/integrations/prometheus_library/cloudwatch.md

 # Monitoring AWS Resources
+
 > [Introduced](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/12621) in GitLab 9.4
 
 GitLab has support for automatically detecting and monitoring AWS resources, starting with the [Elastic Load Balancer](https://aws.amazon.com/elasticloadbalancing/). This is provided by leveraging the official [Cloudwatch exporter](https://github.com/prometheus/cloudwatch_exporter), which translates [Cloudwatch metrics](https://aws.amazon.com/cloudwatch/) into a Prometheus readable form.
 
+## Requirements
+
+The [Prometheus service](../prometheus/index.md) must be enabled.
+
 ## Metrics supported
 
 | Name | Query |

doc/user/project/integrations/prometheus_library/haproxy.md

@@ -3,6 +3,10 @@
 
 GitLab has support for automatically detecting and monitoring HAProxy. This is provided by leveraging the [HAProxy Exporter](https://github.com/prometheus/haproxy_exporter), which translates HAProxy statistics into a Prometheus readable form.
 
+## Requirements
+
+The [Prometheus service](../prometheus/index.md) must be enabled.
+
 ## Metrics supported
 
 | Name | Query |

doc/user/project/integrations/prometheus_library/kubernetes.md

 # Monitoring Kubernetes
+
 > [Introduced](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/8935) in GitLab 9.0
 
-GitLab has support for automatically detecting and monitoring Kubernetes metrics. Kubernetes exposes Node level metrics out of the box via the built-in [Prometheus metrics support in cAdvisor](https://github.com/google/cadvisor). No additional services or exporters are needed.
+GitLab has support for automatically detecting and monitoring Kubernetes metrics.
+
+## Requirements
+
+The [Prometheus](../prometheus.md) and [Kubernetes](../kubernetes.md)
+integration services must be enabled.
 
 ## Metrics supported
 
@@ -23,4 +29,4 @@ Prometheus server up and running. You have two options here:
 In order to isolate and only display relevant metrics for a given environment
 however, GitLab needs a method to detect which labels are associated. To do this, GitLab will [look for an `environment` label](metrics.md#identifying-environments).
 
-If you are using [GitLab Auto-Deploy][../../../ci/autodeploy/index.md] and one of the two [provided Kubernetes monitoring solutions](../prometheus.md#getting-started-with-prometheus-monitoring), the `environment` label will be automatically added.
+If you are using [GitLab Auto-Deploy](../../../../ci/autodeploy/index.md) and one of the two [provided Kubernetes monitoring solutions](../prometheus.md#getting-started-with-prometheus-monitoring), the `environment` label will be automatically added.

doc/user/project/integrations/prometheus_library/nginx.md

 # Monitoring NGINX
+
 > [Introduced](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/12621) in GitLab 9.4
 
 GitLab has support for automatically detecting and monitoring NGINX. This is provided by leveraging the [NGINX VTS exporter](https://github.com/hnlq715/nginx-vts-exporter), which translates [VTS statistics](https://github.com/vozlt/nginx-module-vts) into a Prometheus readable form.
 
+## Requirements
+
+The [Prometheus service](../prometheus/index.md) must be enabled.
+
 ## Metrics supported
 
 | Name | Query |

doc/user/project/integrations/prometheus_library/nginx_ingress.md

 # Monitoring NGINX Ingress Controller
+
 > [Introduced](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/13438) in GitLab 9.5
 
 GitLab has support for automatically detecting and monitoring the Kubernetes NGINX ingress controller. This is provided by leveraging the built in Prometheus metrics included in [version 0.9.0](https://github.com/kubernetes/ingress/blob/master/controllers/nginx/Changelog.md#09-beta1) of the ingress.
 
+## Requirements
+
+The [Prometheus service](../prometheus/index.md) must be enabled.
+
 ## Metrics supported
 
 | Name | Query |