Initial docs about labeling

docs/xks/developer-guide/best-practices.md

@@ -17,4 +17,30 @@ This page aims to collect best practices and common mistakes that can be made wh
 
 Here are some good resources to also read on top of this page.
 
-* [https://srcco.de/posts/web-service-on-kubernetes-production-checklist-2019.html](https://srcco.de/posts/web-service-on-kubernetes-production-checklist-2019.html)
+- [https://srcco.de/posts/web-service-on-kubernetes-production-checklist-2019.html](https://srcco.de/posts/web-service-on-kubernetes-production-checklist-2019.html)
+
+## Labels
+
+There are multiple reasons to label your workloads.
+
+- Grouping
+- Searchability
+- Billing
+
+The Kubernetes communnity have a number of default labels that they recommend to put on all your workloads.
+There are also a number of extra labels that might be useful for you, remember that these labels are only
+examples and you will have to try around to find which labels fits best for you.
+
+### Kubernetes standard Labels
+
+```.yaml
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: deployment
+  labels:
+    app.kubernetes.io/name: user-api
+    app.kubernetes.io/version: "42"
+    app.kubernetes.io/component: api
+    app.kubernetes.io/part-of: payment-gateway
+```