Add queue latency for Sidekiq jobs in NR

config/initializers/nr_sidekiq_queue_latency.rb

@@ -0,0 +1,13 @@
+class NewRelicQueueLatencyLogger
+  def call(worker, job, queue)
+    queue_latency = Time.now.utc - Time.at(job["enqueued_at"], in: "+00:00")
+    ::NewRelic::Agent.add_custom_attributes({ queue_latency: queue_latency, queue: queue })
+    yield
+  end
+end
+
+Sidekiq.configure_server do |config|
+  config.server_middleware do |chain|
+    chain.add NewRelicQueueLatencyLogger
+  end
+end