chain head listener: could log be reordered?

chain head listener: add blocking thread pool contention check

chain head listener: more logs

chain head listener: change watcher deadlock detection to avoid spuri…

…ous deadlock detection

chain head listener: change watcher deadlock detection to avoid spuri…

…ous deadlock detection

chain head listener: add number to logging contexts

chain head listener: switch atomic for mutex

chain head listener: moar moar logs

chain head listener: moar logs

chain head listener: Add per-instance uuid to log context