In the past, I've tried using #redis sentinel for this #mastodon instance. But looks like there is a long standing bug on rubby with redis sentinel.
I don't know if it has been resolved by now. But I think I found a quick resolve for this problem, using a redis proxy whose support sentinel. And one of my candidate is enriclluelles's redis-sentinel-proxy https://github.com/enriclluelles/redis-sentinel-proxy
Will try it soon. There is 3rd party container image at https://hub.docker.com/r/patrickdk/redis-sentinel-proxy

