Werk #19565: Improved Interface Metric Processing When Multiple Up-time Values Are Present

Component	Checks & agents
Title	Improved Interface Metric Processing When Multiple Up-time Values Are Present
Date	Apr 9, 2026
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.6.0b1 Not yet released Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT 2.5.0b5 Not yet released Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT 2.4.0p26 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT

When parsing data for the if64 SNMP section for network interfaces, both sysUpTime and hrSystemUptime are queried.

In general, hrSystemUptime is preferred, unless it is missing and if it is, sysUpTime is used instead.

However, some devices may have an hrSystemUptime value of 0, even though sysUpTime has a valid value.

In this case, metrics stop being collected because 0 is always reported as the uptime and thus does not increase monotonically as expected.

With this update, more checks are done to ensure a valid value is used, and sysUpTime will be preferred if hrSystemUptime is of a lower value.

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