Server updates (#1173)

## Server release  RELEASE.2024-03-26T22-10-45Z 

- Adding info about node dashboard for Grafana.
- Also updates links to JSON files for other dashboards that were
incorrect.

*no related docs issue*

## Not a server release, but fixes:

- Corrects information about JSON policy file size limits.
- Adds information about limit on tags per object.
    
Closes #1134

## Server RELEASE.2024-03-21T23-13-43Z
    
- Adds new `user` envvar and config for REDIS notifications
- Simplifies and updates discussion of encryption keys for SSE
    
Closes #1169

source/reference/minio-server/settings/notifications/redis.rst

@@ -214,6 +214,29 @@ Specify the password for the Redis server.
 
    MinIO redacts this value when returned as part of :mc-cmd:`mc admin config get`.
 
+User
+~~~~
+
+*Optional*
+
+.. versionadded:: RELEASE.2024-03-21T23-13-43Z
+
+.. tab-set::
+
+   .. tab-item:: Environment Variable
+      :sync: envvar
+
+      .. envvar:: MINIO_NOTIFY_REDIS_USER
+
+   .. tab-item:: Configuration Setting
+      :sync: config
+
+      .. mc-conf:: notify_redis user
+         :delimiter: " "
+
+
+Specify the user for the Redis server.
+
 Queue Directory
 ~~~~~~~~~~~~~~~