persistence/redis: add how-to for deletion

docs/persistence/redis/README.md

@@ -15,3 +15,5 @@ for caching.
 :dart: [Create Redis via Application](how-to/create-application.md)
 
 :dart: [Create Redis as a standalone instance](how-to/create-explicit.md).
+
+:dart: [Delete Redis](how-to/delete.md)

docs/persistence/redis/how-to/delete.md

@@ -0,0 +1,56 @@
+---
+tags: [redis, how-to]
+---
+
+# Delete Redis
+
+This page guides you through the steps required to delete a Redis instance.
+
+## Prerequisites
+
+- [You are a member of a NAIS team](../../../explanations/team.md)
+- [You have set up command-line access](../../../operate/how-to/command-line-access.md)
+
+## Steps
+
+Before you delete a Redis instance, ensure that no applications are using it.
+If you delete a Redis instance in use, the applications will lose access to the data stored in the instance.
+
+### List Redis instances
+
+To list all Redis instances belonging to your team:
+
+1. Open [NAIS Console](https://console.<<tenant()>>.cloud.nais.io) in your browser and select your team.
+2. Select the `Redis` tab
+3. Find the name of the Redis instance you want to delete
+
+### Disable termination protection
+
+Before your can delete a specific Redis instance, you must first disable termination protection.
+
+To disable termination protection, run the following command:
+
+```shell
+kubectl patch redis <REDIS-NAME> \
+  --type json \
+  -p='[{"op": "replace", "path": "/spec/terminationProtection", "value": false}]'
+```
+
+### Delete Redis instance
+
+To delete the Redis instance, run the following command:
+
+```shell
+kubectl delete redis <REDIS-NAME>
+```
+
+### Remove references from application manifests
+
+Ensure that all references to the Redis instance are removed from your application manifests:
+
+```diff title="app.yaml"
+spec:
+-  redis:
+-    - instance: <REDIS-INSTANCE-NAME>
+-      access: <ACCESS-LEVEL>
+```