Why ?

I worked on a project that didn't had insights on how many messages were present in "queues" (because of some hosting quirks) and to have this information we've developed a command that aims to make it possible via the Symfony's console.
After a visio call with an ex-colleague on another Symfony project, it turns out that he was verry interested to have this command in Symfony.
I've also discused with@Jean-Beru that literraly pushed me too open that PR.

So here I am.

What does it does ?

This quite simple, like for thesetup-transport command it takes in input all configured transports' receivers andOnly if they implementSymfony\Component\Messenger\Transport\Receiver\MessageCountAwareInterface it gets the message count and prints it out in a pretty little table.

Limitation

This command won't work if the configured transport's receiver does not implementSymfony\Component\Messenger\Transport\Receiver\MessageCountAwareInterface

A small demo ?