Merge branch 'remove-prometheus-nif' into 'develop'

Prometheus: Remove flaky process collection NIF.

See merge request pleroma/pleroma!1281

lib/pleroma/application.ex

@@ -174,7 +174,6 @@ defmodule Pleroma.Application do
       Pleroma.Repo.Instrumenter.setup()
     end
 
-    Prometheus.Registry.register_collector(:prometheus_process_collector)
     Pleroma.Web.Endpoint.MetricsExporter.setup()
     Pleroma.Web.Endpoint.PipelineInstrumenter.setup()
     Pleroma.Web.Endpoint.Instrumenter.setup()

mix.exs

@@ -136,7 +136,6 @@ defmodule Pleroma.Mixfile do
       {:prometheus_plugs, "~> 1.1"},
       {:prometheus_phoenix, "~> 1.2"},
       {:prometheus_ecto, "~> 1.4"},
-      {:prometheus_process_collector, "~> 1.4"},
       {:recon, github: "ferd/recon", tag: "2.4.0"},
       {:quack, "~> 0.1.1"},
       {:benchee, "~> 1.0"},