Hi,
I’ve noticed in the last week or so, some devices are taking a long time to alert as offline.
For example, we powered off a device this morning and I’m unable to snmpwalk or ping the device (confirming it is offline), however it simply sits in the “Poller” section in Validate.php for a while (about 30 minutes) advising that polling took longer than 5 minutes.
Our down alert rule has no delays on alerting.
We use the new LibreNMS ‘dispatcher’ Service in a cluster (managed by Redis, the 3 dispatcher pollers are in the same group, the example device is in this poller group)
$ ./validate.php
| Component | Version |
|---|---|
| LibreNMS | 1.60-18-g19a82e150 |
| DB Schema | 2020_02_05_224042_device_inserted_null (158) |
| PHP | 7.2.24-0ubuntu0.18.04.2 |
| MySQL | 10.1.44-MariaDB-0ubuntu0.18.04.1 |
| RRDTool | 1.7.0 |
| SNMP | NET-SNMP 5.7.3 |
====================================
[OK] Composer Version: 1.9.3
[OK] Dependencies up-to-date.
[OK] Database connection successful
[OK] Database schema correct
[WARN] Some devices have not been polled in the last 5 minutes. You may have performance issues.
[FIX]:
Check your poll log and see: http://docs.librenms.org/Support/Performance/
Devices:
<REDACTED.HOSTNAME>