Switching https://example.com/inbox-safely from green to red because Redis::CommandError ERR max number of clients reached
えええ？
@Gargron No, that's my fault running too many processes and threads against the free Redis service (Heroku Redis $0/month only allows 20 connections.)
@zundan It is because I added Redis connection pools though, it used to only use 1 connection per process. Now each thread gets its own connection, Sidekiq manages its own pool, and Rails cache also manages its own pool.
@Gargron Ah, I see! Sorry to have misread that. I'll read the changes and adjust things for me. Luckily, Rails cache has been running on its own Redis service (another free) for a while.