Readme updates

helm/wekan/README.md

@@ -2,7 +2,57 @@
 
 ## Features
 
- o Uses a MongoDB replica set by default - this allows fault-tolerant and scalable MongoDB deployment (or just set the replicas to 1 for a single server install)
+o Uses a MongoDB replica set by default - this allows fault-tolerant
+  and scalable MongoDB deployment (or just set the replicas to 1 for
+  a single server install)
 
- o Optional Horizontal Pod Autoscaler (HPA), so that your Wekan pods will scale automatically with increased CPU load.
+o Optional Horizontal Pod Autoscaler (HPA), so that your Wekan pods
+  will scale automatically with increased CPU load.
 
+## The configurable values (values.yaml)
+
+Scaling Wekan:
+
+```yaml
+## Configuration for wekan component
+##
+
+replicaCount: 1
+```
+**replicaCount** Will set the initial number of replicas for the Wekan pod (and container)
+
+```yaml
+## Configure an horizontal pod autoscaler
+##
+autoscaling:
+  enabled: true
+  config:
+    minReplicas: 1
+    maxReplicas: 16
+    ## Note: when setting this, a `resources.request.cpu` is required. You
+    ## likely want to set it to `1` or some lower value.
+    ##
+    targetCPUUtilizationPercentage: 80
+```
+This section (if *enabled* is set to **true**) will enable the Kubernetes Horizontal Pod Autoscaler (HPA).
+
+**minReplicas:** this is the minimum number of pods to scale down to (We recommend setting this to the same value as **replicaCount**).
+
+**maxReplicas:** this is the maximum number of pods to scale up to.
+
+**targetCPUUtilizationPercentage:** This is the CPU at which the HPA will scale-out the number of Wekan pods.
+
+```yaml
+mongodb-replicaset:
+  enabled: true
+  replicas: 3
+  replicaSetName: rs0
+  securityContext:
+    runAsUser: 1000
+    fsGroup: 1000
+    runAsNonRoot: true
+```
+
+This section controls the scale of the MongoDB redundant Replica Set.
+
+**replicas:** This is the number of MongoDB instances to include in the set. You can set this to 1 for a single server - this will still allow you to scale-up later with a helm upgrade.