Function detect_memory_limit 

pub fn detect_memory_limit() -> u64

Available on crate feature memory only.

Detect the memory limit for this process.

Priority:

1. Cgroup v2: /sys/fs/cgroup/memory.max
2. Cgroup v1: /sys/fs/cgroup/memory/memory.limit_in_bytes
3. System available memory (via sysinfo)

Returns the limit in bytes.