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The _total suffix is by convention for counters, don't use it on a gauge. Clarify help string. Tweak metric name so it'll sort with related metrics, and be a little more understandable. Remove open file descriptor metric, as Prometheus client_golang provides that out of the box as process_open_fds which is also more up to date. Both only support Linux, so there's no loss of platform support. Fixes #5229