Werk #18524: OTel: Restrict cardinality of services

Component

Checks & agents

Title

OTel: Restrict cardinality of services

Date

Aug 28, 2025

Level

Trivial Change

Class

New Feature

Compatibility

Compatible - no manual interaction needed

Checkmk versions & editions

2.5.0b1 Not yet released	Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME)
2.4.0p12 Not yet released	Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME)

Since the OTel metric service creates Checkmk metrics from OTel datapoints without filtering or restricting them at first, this can result in a high number of metrics per service. To ensure this number does not grow uncontrollably, the number of emitted Checkmk metrics is now restricted to 20.

At 15 metrics, the service will go to WARN to inform about the upcoming restriction. At 20 metrics, they are aggregated into one metric, per default by averaging. The aggregation method can be configured in the "OpenTelemetry (experimental) (Managed Services Edition, Cloud Edition)" service monitoring rule.

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