private void monitorThreads() {
        Collection<Thread> threads = Threads.getAllThreads();
        warnOnThreadsHavingClassloaderFromUninstalledBundles(threads);
    }
A watchdog that monitors all deactivated {@link ActiveContainer} instances with the purpose of detecting stale containers.

@author bjorncs
jdisc_core/src/main/java/com/yahoo/jdisc/core/ContainerWatchdog.java