how to get memory limit in golang server without k8s client

memory_limit_in_container.go

// Open the cgroup hierarchy of the current container
f, err := os.Open("/sys/fs/cgroup/memory/memory.limit_in_bytes")
if err != nil {
    // Handle error
}
defer f.Close()

// Read the maximum memory limit from the file
var maxMemLimit int64
_, err = fmt.Fscanf(f, "%d", &maxMemLimit)
if err != nil {
    // Handle error
}