Werk #17628: Changed metric 'mem_total' to be derived rather than stored in memory plugin

Component	Checks & agents
Title	Changed metric 'mem_total' to be derived rather than stored in memory plugin
Date	Mar 5, 2025
Level	Trivial Change
Class	New Feature
Compatibility	Incompatible - Manual interaction might be required
Checkmk versions & editions	2.5.0b1 Not yet released Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME) 2.4.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME) 2.3.0 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME)

This is only incompatible for users relying on the presence of the metrics in the RRDs, for example in the configration for the integration with InfluxDB.

The metric mem_total is not longer produced directly by the plugin "Usage of Physical and Virtual RAM". It is instead computed from the other available metrics. We introduced this change in Checkmk 2.3 as an optimization as the metric was redundant. This did not affect Checkmks internal monitoring.

However: It can cause issues for external integrations relying on the metric being present, such as the integration with InfluxDB.

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