Eventlog error: Error discovering sensors module. Check log file for more details

netzor · 14 January 2026 16:19

Eventlog error during scheduled discovery every 9 hours on all devices.

Full error from librenms.log:
paste.sh · encrypted pastebin

[CRITICAL] Exception: Error Failed opening required ‘includes/discovery/sensors/cisco-entity-sensor.inc.php’ (include_path=‘.:/usr/share/php83’) @ /opt/librenms/includes/discovery/sensors.inc.php:14

Docker compose installation:

Same error on new docker compose deployment with empty db.

netzor · 15 January 2026 14:45

Fixed in:

github.com/librenms/librenms

Fix relative includes in discovery code

master ← murrant:discovery-includes

opened 05:17PM - 14 Jan 26 UTC

murrant

+44 -65

fixes #18794 It is more likely that discovery will be called from a different… working directory now. Let's just make that work. #### Please note > Please read this information carefully. You can run `./lnms dev:check` to check your code before submitting. - [x] Have you followed our [code guidelines?](https://docs.librenms.org/Developing/Code-Guidelines/) - [x] If my Pull Request does some changes/fixes/enhancements in the WebUI, I have inserted a screenshot of it. - [x] If my Pull Request makes discovery/polling/yaml changes, I have added/updated [test data](https://docs.librenms.org/Developing/os/Test-Units/). #### Testers If you would like to test this pull request then please run: `./scripts/github-apply <pr_id>`, i.e `./scripts/github-apply 5926` After you are done testing, you can remove the changes with `./scripts/github-remove`. If there are schema changes, you can ask on discord how to revert.