Add some CNCF branding.

content/community.html

@@ -23,6 +23,7 @@ title: Community
     <p>
       <strong>Issue tracker:</strong> We use the GitHub issue tracker for the various <a href="http://github.com/prometheus">Prometheus repositories</a>
     </p>
+
     <h1>Contributing</h1>
     <p>
       We welcome community contributions! Please see the
@@ -31,6 +32,16 @@ title: Community
       more elaborate or controversial changes, please discuss them on the mailing
       list before sending a pull request.
     </p>
+
+    <h1>Project Governance</h1>
+    <p>
+      Prometheus is an independent open-source project and not controlled by
+      any single company.  To emphasize this and clarify our governance
+      structure, we joined the
+      <a href="https://cncf.io/">Cloud Native Computing Foundation</a> in 2016.
+    </p>
+    <a href="https://cncf.io/"><img class="orig-size" src="/assets/cncf_logo.png"></a> 
+
     <h1>Commercial support</h1>
     <p>
       This is a list of third-party companies which provide support or
@@ -40,6 +51,7 @@ title: Community
     <ul>
       <li><a href="http://www.robustperception.io">Robust Perception</a></li>
     </ul>
+
     <h1>Acknowledgements</h1>
     <p>
       Prometheus was initially started by

content/css/docs.css

@@ -348,6 +348,11 @@ footer {
   display: block;
 }
 
+.doc-content img.orig-size {
+  width: auto;
+  margin-left: 0;
+}
+
 .toc {
   padding: 1em;
   background-color: #f5f5f5;

content/docs/introduction/overview.md

@@ -12,7 +12,10 @@ monitoring and alerting toolkit originally built at
 [SoundCloud](http://soundcloud.com). Since its inception in 2012, many
 companies and organizations have adopted Prometheus, and the project has a very
 active developer and user [community](/community). It is now a standalone open source project
-and maintained independently of any company.
+and maintained independently of any company. To emphasize this and clarify
+the project's governance structure, Prometheus joined the
+[Cloud Native Computing Foundation](https://cncf.io/) in 2016
+as the second hosted project after [Kubernetes](http://kubernetes.io/).
 
 For a more elaborate overview, see the resources linked from the
 [media](/docs/introduction/media/) section.

content/index.html

@@ -99,6 +99,10 @@ layout: jumbotron
       <h1><i class="fa fa-github"></i> Open Source</h1>
       <p>Prometheus is 100% open source and community-driven. All components are available under the <a href="http://www.apache.org/licenses/LICENSE-2.0">Apache 2 License</a> on <a href="https://github.com/prometheus">GitHub</a>.</p>
       <iframe src="https://ghbtns.com/github-btn.html?user=prometheus&repo=prometheus&type=star&count=true&size=large" frameborder="0" scrolling="0" class="github-stars"></iframe>
+      <br><br>
+      <p>We are a <a href="https://cncf.io/">Cloud Native Computing Foundation</a> member project.</p>
+      <br>
+      <p><a href="https://cncf.io/"><img src="assets/cncf_logo.png"></a></p>
     </div>
   </div>