Logging external workers activity details in camunda spring boot engine

hi everyone
I’m configuring an embedded camunda engine in spring boot server and i’m trying to add some customized logs for each step. one of these these steps is that i want to be aware that which external worker with what external id has polled the server and on polling what tasks with what business keys has been polled?
I was looking for some sort of listener like ExecutionListener for this job but i couldn’t find it. i already configured task logging with customized details with ExecutionListener.
if there is better way than listeners and i don’t know about the concept i will be glad to know about it.
I also have to mention that i put this in my logback and i got no information about external tasks in my logs:

 <logger name="org.camunda.bpm.engine.externaltask" level="debug"/>

thanks in advance.