I guess that's a wrong namespace, maybe related to history/renames?
Seehttps://github.com/Seldaek/monolog/blob/main/src/Monolog/Processor/ProcessorInterface.php
Git blame will point at me for the removed lines, and I'm sure I added them for a reason (can't recall right now.)

I guess that's a wrong namespace, maybe related to history/renames?

The pass was added in#33663 and those lines haven't changed since then. I've browsed the source tree that very commit but the bridge did not have that interface at that time either.

I dug deeper and apparently, the interface did exist for a brief moment: Introduced in#27801, reverted in#28845.

I assume that the lines are an artifact of an earlier iteration of that PR. Since they effectively never did anything, the fix for me is to remove them.

The purpose of those lines was to wire processors automatically with the untracked token storage, so that they could log things found in the session without triggeringCache-Control: private on the response.

We should fix this behavior of it's broken.

Should we build that logic in MonologBundle instead?

I was having a look, monolog bundle already registers the tag for autoconfiguration:
https://github.com/symfony/monolog-bundle/blob/fde12fc628162787a4e53877abadc30047fd868b/DependencyInjection/MonologExtension.php#L131-L134

What this does is the binding. And we could argue that the binding is for SecurityBundle.

To me, we should fix the namespace in the lowest affected branch.