More specifically, how could I find the subscribers performing the routing system for Drupal?
We tried using
ddebug_backtrace(), but I couldn't get anything.
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Instead of ddebug use the Symfony Webprofiler, that is included in the D8 version of the module Devel:
Add a powerful footer to all pages of your site. There, admins can review resource utilization, cache effectiveness, database queries, Views, and so much more.