How about adding a blocking delay into if-up script?
========================
LOCK_FILE=/tmp/openssh-server-delay
# if lock file exists and is less than 1 second old, do nothing.
# else create a lock file, wait 1 second, remove lock file, restart
if [ -e "${LOCK_FILE}" ] && [ "$(( $(date +%s) - $(stat -c %Y "${LOCK_FILE}")
))" -lt "1" ]
then
exit 0
else
touch "${LOCK_FILE}"
sleep 1s
rm "${LOCK_FILE}"
invoke-rc.d ssh restart >/dev/null 2>&1 || true
fi
========================
This way if there is a burst of restart requests within one second, restart
would occur only once, with 1 second delay.
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