gems: include vendored metrisk without hitime dependency

hitime is only needed for Metriks::Timer and requires native extensions.
Those do not compile with default settings under Ubuntu 26.04 or Alpine 3.24.

lib/metriks/reporter/proc_title.rb

@@ -0,0 +1,63 @@
+# Vendored from metriks 0.9.9.8 — https://github.com/eric/metriks
+# Copyright (c) 2012 Eric Lindvall, MIT licensed.
+# Trimmed to the subset dyndnsd uses (meters + registry + reporters).
+
+module Metriks::Reporter
+  class ProcTitle
+    def initialize(options = {})
+      @rounding = options[:rounding] || 1
+      @prefix   = options[:prefix]   || $0.dup
+
+      @interval  = options[:interval] || 5
+      @on_error  = options[:on_error] || proc { |ex| }
+
+      @metrics  = []
+    end
+
+    def add(name, suffix = nil, &block)
+      @metrics << [ name, suffix, block ]
+    end
+
+    def empty?
+      @metrics.empty?
+    end
+
+    def start
+      @thread ||= Thread.new do
+        loop do
+          begin
+            unless @metrics.empty?
+              title = generate_title
+              if title && !title.empty?
+                $0 = "#{@prefix} #{title}"
+              end
+            end
+          rescue Exception => ex
+            @on_error[ex] rescue nil
+          end
+          sleep @interval
+        end
+      end
+    end
+
+    def stop
+      @thread.kill if @thread
+      @thread = nil
+    end
+
+    def restart
+      stop
+      start
+    end
+
+    protected
+    def generate_title
+      @metrics.collect do |name, suffix, block|
+        val = block.call
+        val = "%.#{@rounding}f" % val if val.is_a?(Float)
+
+        "#{name}: #{val}#{suffix}"
+      end.join(' ')
+    end
+  end
+end