Werk #18472: Restore async/cached agent plugins
| Component | Checks & agents | ||||
| Title | Restore async/cached agent plugins | ||||
| Date | Jul 29, 2025 | ||||
| Level | Trivial Change | ||||
| Class | Bug Fix | ||||
| Compatibility | Compatible - no manual interaction needed | ||||
| Checkmk versions & editions |
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This reverts Werk #16813 and Werk #18216
Werk #16813 changed the way async agent
plugins were executed and killed if they took longer than the creation timeout
(twice the interval of the async execution). It utilized setsid which is
not available on all platforms.
On platforms without setsid the new implementation caused flapping agent
timeout warnings in the Checkmk Service.
We decided to revert the new implementation and go back to the implementation of Checkmk 2.3
Please note that this means that async agent plugins that take longer than the creation timeout are not killed and will take up resources until they finished. You can notice that by the warnings generated by the agent plugin timeouts in the Checkmk Service. You should then decide to either remove the plugin, or set higher values for the interval of said plugin (using the agent bakery rule "Set cache age for plug-ins (Linux, UNIX)"), as this also prolongs the creation timeout.