discourse/app/controllers/admin/diagnostics_controller.rb

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class Admin::DiagnosticsController < Admin::AdminController
layout false
skip_before_filter :check_xhr
def memory_stats
stats = GC.stat.map{|k,v| "#{k}: #{v}"}
counts = ObjectSpace.count_objects.map{|k,v| "#{k}: #{v}"}
render text: "GC STATS:\n#{stats.join("\n")} \n\nObjects:\n#{counts.join("\n")}",
content_type: Mime::TEXT
end
end