CPU and RAM percentage of usage metrics

I need to collect the percentage of usage of CPU and RAM.

I've seen from the README that for Linux these metrics are available with the class ProcessCollector. Indeed I see something just starting the server with start_http_server(8000).

Then, by connecting to localhost:8000, I see an output like this:

# HELP python_gc_objects_collected_total Objects collected during gc
# TYPE python_gc_objects_collected_total counter
python_gc_objects_collected_total{generation="0"} 618.0
python_gc_objects_collected_total{generation="1"} 620.0
python_gc_objects_collected_total{generation="2"} 0.0
# HELP python_gc_objects_uncollectable_total Uncollectable object found during GC
# TYPE python_gc_objects_uncollectable_total counter
python_gc_objects_uncollectable_total{generation="0"} 0.0
python_gc_objects_uncollectable_total{generation="1"} 0.0
python_gc_objects_uncollectable_total{generation="2"} 0.0
# HELP python_gc_collections_total Number of times this generation was collected
# TYPE python_gc_collections_total counter
python_gc_collections_total{generation="0"} 329.0
python_gc_collections_total{generation="1"} 29.0
python_gc_collections_total{generation="2"} 2.0
# HELP python_info Python platform information
# TYPE python_info gauge
python_info{implementation="CPython",major="3",minor="7",patchlevel="4",version="3.7.4"} 1.0
# HELP process_virtual_memory_bytes Virtual memory size in bytes.
# TYPE process_virtual_memory_bytes gauge
process_virtual_memory_bytes 2.096193536e+09
# HELP process_resident_memory_bytes Resident memory size in bytes.
# TYPE process_resident_memory_bytes gauge
process_resident_memory_bytes 2.752512e+08
# HELP process_start_time_seconds Start time of the process since unix epoch in seconds.
# TYPE process_start_time_seconds gauge
process_start_time_seconds 1.6355184461e+09
# HELP process_cpu_seconds_total Total user and system CPU time spent in seconds.
# TYPE process_cpu_seconds_total counter
process_cpu_seconds_total 3.6799999999999997
# HELP process_open_fds Number of open file descriptors.
# TYPE process_open_fds gauge
process_open_fds 7.0
# HELP process_max_fds Maximum number of open file descriptors.
# TYPE process_max_fds gauge
process_max_fds 1.048576e+06

How can I customize this output in order to have RAM, CPU (and eventually GPU) percentage of usage?

For example, I see process_cpu_seconds_total 3.6799999999999997 but I'd like to have something like process_cpu_perc_total 50%. The same for the RAM.

Bắt đầu với tài liệu về ProcessCollector trong README và các metric process_* được hiển thị trong issue. Làm rõ liệu dự án có nên thêm các metric phần trăm CPU và RAM hay không, liệu hỗ trợ GPU có nằm trong phạm vi hay không, và các phép đo nên được định nghĩa như thế nào; issue không nêu tên tệp, test hoặc tiêu chí hoàn thành.