add acl related config in sentinel.conf (redis#7952)

sentinel.conf

@@ -124,6 +124,42 @@ sentinel monitor mymaster 127.0.0.1 6379 2
 # Default is 30 seconds.
 sentinel down-after-milliseconds mymaster 30000
 
+# IMPORTANT NOTE: starting with Redis 6.2 ACL capability is supported for
+# Sentinel mode, please refer to the Redis website https://redis.io/topics/acl
+# for more details.
+
+# Sentinel's ACL users are defined in the following format:
+#
+#   user <username> ... acl rules ...
+#
+# For example:
+#
+#   user worker +@admin +@connection ~* on >ffa9203c493aa99
+#
+# For more information about ACL configuration please refer to the Redis
+# website at https://redis.io/topics/acl and redis server configuration 
+# template redis.conf.
+
+# ACL LOG
+#
+# The ACL Log tracks failed commands and authentication events associated
+# with ACLs. The ACL Log is useful to troubleshoot failed commands blocked 
+# by ACLs. The ACL Log is stored in memory. You can reclaim memory with 
+# ACL LOG RESET. Define the maximum entry length of the ACL Log below.
+acllog-max-len 128
+
+# Using an external ACL file
+#
+# Instead of configuring users here in this file, it is possible to use
+# a stand-alone file just listing users. The two methods cannot be mixed:
+# if you configure users here and at the same time you activate the external
+# ACL file, the server will refuse to start.
+#
+# The format of the external ACL user file is exactly the same as the
+# format that is used inside redis.conf to describe users.
+#
+# aclfile /etc/redis/sentinel-users.acl
+
 # requirepass <password>
 #
 # You can configure Sentinel itself to require a password, however when doing