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very interesting, thanks for sharing. btw. There's https://github.com/reactor/BlockHound which is also very helpful, works for Netty apps too. Related to "[DISCUSS] PIP-232: Introduce thread monitor to check if thread is blocked for long time" https://lists.apache.org/thread/2hqn5k3l64vs1d0tjrxbzr292sfl4qtg Perhaps you could share on that thread too?