Recently, I set up one-minute ping checks following https://docs.librenms.org/Extensions/Fast-Ping-Check/ on one of my distributed pollers. You can see my
/etc/cron.d/librenms for the poller below:
33 */6 * * * librenms /opt/librenms/cronic /opt/librenms/discovery-wrapper.py 1 */5 * * * * librenms /opt/librenms/discovery.php -h new >> /dev/null 2>&1 * * * * * librenms /opt/librenms/cronic /opt/librenms/poller-wrapper.py 16 */5 * * * * librenms /opt/librenms/poll-billing.php >> /dev/null 2>&1 01 * * * * librenms /opt/librenms/billing-calculate.php >> /dev/null 2>&1 */5 * * * * librenms /opt/librenms/check-services.php >> /dev/null 2>&1 * * * * * librenms /opt/librenms/ping.php >> /dev/null 2>&1
I’ve followed all the steps related the rrdcached, and I see the ping data recorded in the UI. I’ve also set an alert to go off every 5 minutes:
However, for some reason I seem to be getting an alert every minute at ~30s mark:
Any idea why that might be the case? Let me know if you need anymore information.