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Add anon and file-backed RSS metrics

Matthias Käppler requested to merge mk-anon-vs-filebacked-metrics into master

What does this MR do and why?

It could be useful to track anonymous and file-backed memory growth in Ruby separately, so I added two new process metrics:

  • ruby_process_resident_anon_memory_bytes
  • ruby_process_resident_file_memory_bytes

They should always sum to ruby_process_resident_memory_bytes. Technically this means that we could remove this one, but that would be a breaking change and it is also quite convenient to have all three.

Born out of this discussion: https://gitlab.com/gitlab-com/gl-infra/capacity-planning/-/issues/171#note_1150647010

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Edited by Matthias Käppler

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