Errors with fresh installed librenms and lnms dev:check

Hello folks,

I have some additional OIDs for Cisco ASA and IOS devices that I would like to share with the community. I tried to set up a dev environment for this purpose.

After installing a fresh Debian 13 and following the installation guide successfully, I went through the additional guide for contributions and failed at this command: ./lnms dev:check

The output should look like this: Tests ok, submit away :)

But I see some errors on a freshly installed LibreNMS at the end of running the dev:check command:

ERRORS! Tests: 4075, Assertions: 7610, Errors: 217, Failures: 3, Skipped: 2754, Risky: 4.

Output from ./validate.php:

Component        Version
LibreNMS         26.3.1 (2026-04-13T21:37:48+02:00)
DB Schema        2026_04_02_141445_add_ssl_certificate_update_permission (381)
PHP              8.4.16
Python           3.13.5
Database         MariaDB 11.8.6-MariaDB-0+deb13u1 from Debian
RRDTool          1.7.2
SNMP             5.9.4.pre2
[OK]    Composer Version: 2.9.7
[OK]    Dependencies up-to-date.
[WARN]  Debug enabled. This is a security risk.
[WARN]  You have no devices.
[FIX]:  Consider adding a device such as localhost: http://10.0.1.65/addhost
[OK]    Database Connected
[OK]    Database Schema is current
[OK]    SQL Server meets minimum requirements
[OK]    lower_case_table_names is enabled
[OK]    MySQL engine is optimal
[OK]    Database and column collations are correct
[OK]    Database schema correct
[OK]    MySQL and PHP time match
[OK]    Locks are functional
[OK]    Python poller wrapper is polling
[OK]    Redis is unavailable
[OK]    rrd_dir is writable
[OK]    rrdtool version ok
[WARN]  Your local git contains modified files, this could prevent automatic updates.
[FIX]:  You can fix this with ./scripts/github-remove
Modified Files:
  LibreNMS/Alert/RunAlerts.php
  LibreNMS/Authentication/LegacyAuth.php
  LibreNMS/DB/SyncsModels.php
  LibreNMS/Data/Store/InfluxDB.php
  LibreNMS/Discovery/YamlDiscoveryDefinition.php
  LibreNMS/Exceptions/DatabaseInconsistentException.php
  LibreNMS/Interfaces/Discovery/EntityPhysicalDiscovery.php
  LibreNMS/Interfaces/Discovery/Ipv4AddressDiscovery.php
  LibreNMS/Interfaces/Discovery/Ipv6AddressDiscovery.php
  LibreNMS/Interfaces/Discovery/MacAccountingDiscovery.php
  LibreNMS/Modules/PortSecurity.php
  LibreNMS/Modules/UcdDiskio.php
  LibreNMS/OS/Aos6.php
  LibreNMS/OS/Aos7.php
  LibreNMS/OS/Awplus.php
  and 455 more…

Side question for the community: Is there a straightforward way for a non-developer to set up a working dev environment just to contribute additional OIDs (e.g. YAML-based sensor definitions for Cisco ASA/IOS)? Ideally something like a step-by-step guide or a ready-to-use VM/container image where ./lnms dev:check passes cleanly out of the box, so that contributors without a deep development background can focus on the actual OID work rather than fighting the toolchain. Any pointers would be greatly appreciated!