I got this idea to create a servlet filter, that would inspect the thread-local store for the thread currently processing the request and log any thread-local references that exist before the request is dispatched down the chain and also when it comes back. Such a servlet could be packaged as a Confluence Servlet Filter Plugin, so that it is convenient to develop and deploy it.
J. Protze, M. Schulz, D. Ahn, и M. Müller. Proceedings of the 27th International Symposium on High-Performance Parallel and Distributed Computing, стр. 144--155. ACM, (2018)