[Bug] (metrics) doris_be_process_thread_num is always 0

[kylinmac]

Search before asking

• I had searched in the issues and found no similar issues.

Version

2.0.9

What's Wrong?

doris_be_process_thread_num is always 0 , maybe is_regular_file should be replaced by is_directory

void DorisMetrics::_update_process_thread_num() {
    std::error_code ec;
    std::filesystem::directory_iterator dict_iter("/proc/self/task/", ec);
    if (ec) {
        LOG(WARNING) << "failed to count thread num: " << ec.message();
        process_fd_num_used->set_value(0);
        return;
    }
    int64_t count =
            std::count_if(dict_iter, std::filesystem::end(dict_iter), [](const auto& entry) {
                std::error_code error_code;
                return entry.is_regular_file(error_code) && !error_code;
            });

    process_thread_num->set_value(count);
}`

What You Expected?

get right doris_be_process_thread_num

How to Reproduce?

No response

Anything Else?

No response

Are you willing to submit PR?

• Yes I am willing to submit a PR!

Code of Conduct

• I agree to follow this project's Code of Conduct