feat: add health server and prometheus metrics to worker

app/util/has_prometheus_metrics.rb

@@ -0,0 +1,23 @@
+# frozen_string_literal: true
+
+module HasPrometheusMetrics
+
+  def register_prometheus_counter(name, **kwargs)
+    counter = Prometheus::Client::Counter.new(name, **kwargs)
+    registry.register(counter)
+  end
+
+  def increment_prometheus_counter(name, labels: {})
+    counter = registry.get(name)
+    return if counter.nil?
+
+    counter.increment(labels: labels)
+  end
+
+  private
+
+  def registry
+    Prometheus::Client.registry
+  end
+
+end