Werk #17399: Sawtooth pattern in cached SNMP interface graphs

Component

Checks & agents

Title

Sawtooth pattern in cached SNMP interface graphs

Date

Nov 26, 2024

Level

Trivial Change

Class

Bug Fix

Compatibility

Incompatible - Manual interaction might be required

Checkmk versions & editions

2.4.0b1 Not yet released	Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME)
2.3.0p22	Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME)

This only affects users that configured the rule "Fetch intervals for SNMP sections" for the section "if64".

If users configured a custom fetch interval for this section, but not for the "uptime" section, the service graphs would exhibit a sawtooth pattern. Measured values would jump between zero and a too large value (by a factor proportional to the configured interval).

This is fixed now, and the reported values are correct. Note that the graph will still have interruptions, as correct rates can only be computed when new SNMP data is fetched and not inbetween.

Affected users might want to disable this rule during the upgrade, as the service will crash until the section has been fetched again.

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