mongo-ruby-driver VS redis-rb

The MongoDB Ruby Driver is hosted at RubyGems, or if you'd like to explore the source code it can be found on GitHub.

In regards to mongoid, no, I'm not using this, I am using the official MongoDB driver for Ruby (https://github.com/mongodb/mongo-ruby-driver/)

You're right the general client doesn't have the stack support yet. https://github.com/redis/redis-rb.

Sidekiq integration - requires the Redis gem 3.3.5 or higher. For this integration, the AppSignal gem 2.9.5 or higher is recommended.

It mentions hiredis. A quick look at the redis-rb source code yields that this is coming from Hiredis connection: https://github.com/redis/redis-rb/blob/6542934f01b9c390ee450bd372209a04bc3a239b/lib/redis/connection/hiredis.rb#L18

You're likely already using this library to connect, but check out these docs: https://github.com/redis/redis-rb#cluster-support

I use redis-rb to connect to my Redis cluster (multi shard/node architecture) from my Rails app. In the documentation, I can see that it is enough to provide the cluster endpoint while initialising the client and the client will discover the node endpoints along with their respective keys slot using the cluster-nodes command:

The redis-rb gem is not thread-friendly by default. If you use redis-rb without a connection pool you will end up with race conditions on Redis accesses.