I was running the cache:pool:prune command and nothing was pruned. I discovered that no pools were added to the command even though I have about 6 of them in my application.

The CachePoolPrunerPass is responsible for adding the pools to the command, but uses the class name of the command to find its service. This might be fine for Symfony 4, but in my 3.4 application it cannot find the service. After I changed the service id to console.command.cache_pool_prune the compiler pass worked correctly again and I could prune my cache pools.

I could make a PR for this, but I think it might break it on Symfony 4. What would be the best way to proceed with this?