chore: reduce redis-cluster pods and move HA out of "experimental" state (#565)

The pod reduction for `redis-cluster` should help users seeking for a Gitea deployment with less pods. Users seeking for a minimal deployment are further advised to follow https://gitea.com/gitea/helm-chart#user-content-single-pod-configurations.

HA is working fine in the provided configuration and should be moved out of the "experimental" state given that there were no reports of Gitea malfunctioning reported to HA usage in recent months/since v9 release.

Reviewed-on: https://gitea.com/gitea/helm-chart/pulls/565
Reviewed-by: techknowlogick <techknowlogick@noreply.gitea.com>
Co-authored-by: pat-s <patrick.schratz@gmail.com>
Co-committed-by: pat-s <patrick.schratz@gmail.com>

README.md

@@ -10,7 +10,7 @@
     - [Database defaults](#database-defaults)
     - [Server defaults](#server-defaults)
     - [Metrics defaults](#metrics-defaults)
-    - [Rootless defaults](#rootless-defaults)
+    - [Rootless Defaults](#rootless-defaults)
   - [Single-Pod Configurations](#single-pod-configurations)
   - [Additional _app.ini_ settings](#additional-appini-settings)
     - [User defined environment variables in app.ini](#user-defined-environment-variables-in-appini)
@@ -105,10 +105,8 @@ When upgrading, please refer to the [Upgrading](#upgrading) section at the botto
 
 ## High Availability
 
-⚠️ **EXPERIMENTAL** ⚠️
-
-Since version 9.0.0 this chart has experimental support for running Gitea and it's dependencies in a HA setup.
-The setup is still experimental and care must be taken for production use as Gitea core is not yet officially HA-ready.
+Since version 9.0.0 this chart supports running Gitea and it's dependencies in HA mode.
+Care must be taken for production use as not all implementation details of Gitea core are officially HA-ready yet.
 
 Deploying a HA-ready Gitea instance requires some effort including using HA-ready dependencies.
 See the [HA Setup](docs/ha-setup.md) document for more details.
@@ -996,10 +994,12 @@ To comply with the Gitea helm chart definition of the digest parameter, a "custo
 
 ### redis-cluster
 
-| Name                        | Description                            | Value   |
-| --------------------------- | -------------------------------------- | ------- |
-| `redis-cluster.enabled`     | Enable redis                           | `true`  |
-| `redis-cluster.usePassword` | Whether to use password authentication | `false` |
+| Name                             | Description                                  | Value   |
+| -------------------------------- | -------------------------------------------- | ------- |
+| `redis-cluster.enabled`          | Enable redis                                 | `true`  |
+| `redis-cluster.usePassword`      | Whether to use password authentication       | `false` |
+| `redis-cluster.cluster.nodes`    | Number of redis cluster master nodes         | `3`     |
+| `redis-cluster.cluster.replicas` | Number of redis cluster master node replicas | `0`     |
 
 ### PostgreSQL-ha
 

docs/ha-setup.md

@@ -1,7 +1,5 @@
 # High Availability
 
-⚠️ **EXPERIMENTAL** ⚠️
-
 All components (in-memory DB, volume/asset storage, code indexer) used by Gitea must be deployed in a HA-ready fashion to achieve a full HA-ready Gitea deployment.
 The following document explains how to achieve this for all individual components.
 
@@ -97,6 +95,11 @@ To do so, you need to set the following configuration values yourself:
 - `gitea.config.cache.ADAPTER`: `redis`
 - `gitea.config.cache.HOST`: `<your redis connection string>`
 
+By default, the `redis-cluster` chart provisions three standalone master nodes of which each has a single replica.
+To reduce the number of pods for a default Gitea deployment, we opted to omit the replicas (`replicas: 0`) by default.
+Only the minimum required number of master pods for a functional `redis-cluster` deployment are provisioned.
+For a "proper" `redis-cluster` setup however, we recommend to set `replicas: 1` and `nodes: 6`.
+
 ## Object and asset storage
 
 Object/asset storage refers to the storage of attachments, avatars, LFS files, etc.

values.yaml

@@ -479,9 +479,14 @@ gitea:
 ## @section redis-cluster
 ## @param redis-cluster.enabled Enable redis
 ## @param redis-cluster.usePassword Whether to use password authentication
+## @param redis-cluster.cluster.nodes Number of redis cluster master nodes
+## @param redis-cluster.cluster.replicas Number of redis cluster master node replicas
 redis-cluster:
   enabled: true
   usePassword: false
+  cluster:
+    nodes: 3 # default: 6
+    replicas: 0 # default: 1
 
 ## @section postgresql-ha
 #