private boolean isPastGracePeriod(DeactivatedContainer container) {
        return clock.instant().isAfter(container.timeDeactivated.plus(GRACE_PERIOD));
    }
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