fix: use container-aware load averages

[jiri001meitner]

Summary

• read Linux load averages from /proc/loadavg
• avoid leaking the physical host load into LXC/container metrics
• retain sys_getloadavg() as a portable fallback when the OS backend cannot provide a value
• add tests for valid, missing, and malformed /proc/loadavg data

Problem

Inside an LXC container, PHP's sys_getloadavg() can report the physical host load while /proc/loadavg is correctly virtualized for the container. Server Info then divides the host load by the container's CPU count, producing persistent values such as 500% on an otherwise idle 8-vCPU container.

Observed on the affected system:

sys_getloadavg(): 37.91 42.84 49.44
/proc/loadavg:     0.22  0.41  0.41
CPUs:              8

Linux now prefers its namespace-aware procfs value. Non-Linux systems and installations where procfs is unavailable keep the existing PHP fallback.

Validation

• PHP syntax check passes
• PHP CS Fixer passes
• Psalm passes with no errors
• verified against the affected LXC installation: the Server Info backend and /proc/loadavg now return the same three values
• unit tests added for valid, unavailable, and invalid procfs data; the complete PHPUnit suite could not be run locally because the packaged Nextcloud installation does not ship the core test framework

AI assistance

This contribution was prepared with assistance from OpenAI Codex (GPT-5). The contributor reviewed, tested, and is responsible for the submitted changes.

[kesselb]

Thanks for your PR

[kesselb]

		if (function_exists('sys_getloadavg')) {
			return sys_getloadavg();
		}
		return false;

1. Please check if the function is available (e.g. when disabled with disabled_functions).

2. Please remove getAverageLoad in Cpu.php.

[jiri001meitner]

Done! Added function_exists('sys_getloadavg') check for fallback and removed the redundant getAverageLoad method from CPU.php.

[github-actions]

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[kesselb]

/backport to stable35