Add load balancing Prometheus metrics in server_metrics middleware

doc/administration/monitoring/prometheus/gitlab_metrics.md

@@ -250,9 +250,10 @@ configuration option in `gitlab.yml`. These metrics are served from the
 
 The following metrics are available:
 
-| Metric                            | Type      | Since                                                         | Description                            |
-|:--------------------------------- |:--------- |:------------------------------------------------------------- |:-------------------------------------- |
-| `db_load_balancing_hosts`         | Gauge     | [12.3](https://gitlab.com/gitlab-org/gitlab/-/issues/13630)     | Current number of load balancing hosts |
+| Metric                            | Type      | Since                                                         | Description                            | Labels                                                    |
+|:--------------------------------- |:--------- |:------------------------------------------------------------- |:-------------------------------------- |:--------------------------------------------------------- |
+| `db_load_balancing_hosts`         | Gauge     | [12.3](https://gitlab.com/gitlab-org/gitlab/-/issues/13630)   | Current number of load balancing hosts | |
+| `sidekiq_load_balancing_count`    | Counter   | 13.11                                                         | Sidekiq jobs using load balancing with data consistency set to :sticky or :delayed | `queue`, `boundary`, `external_dependencies`, `feature_category`, `job_status`, `urgency`, `data_consistency`, `database_chosen` |
  
 ## Database partitioning metrics **(PREMIUM SELF)**
 

ee/changelogs/unreleased/326225-add-sidekiq-lb-server-metrics.yml

+---
+title: Add load balancing Sidekiq metrics
+merge_request: 58473
+author:
+type: other

ee/lib/ee/gitlab/sidekiq_middleware/server_metrics.rb

+# frozen_string_literal: true
+module EE
+  module Gitlab
+    module SidekiqMiddleware
+      module ServerMetrics
+        extend ::Gitlab::Utils::Override
+
+        protected
+
+        override :init_metrics
+        def init_metrics
+          super.merge(init_load_balancing_metrics)
+        end
+
+        override :instrument
+        def instrument(job, labels)
+          super
+        ensure
+          record_load_balancing(job, labels)
+        end
+
+        private
+
+        def init_load_balancing_metrics
+          return {} unless ::Gitlab::Database::LoadBalancing.enable?
+
+          {
+            sidekiq_load_balancing_count: ::Gitlab::Metrics.counter(:sidekiq_load_balancing_count, 'Sidekiq jobs with load balancing')
+          }
+        end
+
+        def record_load_balancing(job, labels)
+          return unless ::Gitlab::Database::LoadBalancing.enable?
+          return unless job[:database_chosen]
+
+          load_balancing_labels = {
+            database_chosen: job[:database_chosen],
+            data_consistency: job[:data_consistency]
+          }
+
+          metrics[:sidekiq_load_balancing_count].increment(labels.merge(load_balancing_labels), 1)
+        end
+      end
+    end
+  end
+end

ee/lib/gitlab/database/load_balancing/sidekiq_client_middleware.rb

@@ -19,6 +19,9 @@ module Gitlab
           return unless worker_class
           return unless worker_class.include?(::ApplicationWorker)
           return unless worker_class.get_data_consistency_feature_flag_enabled?
+
+          job['worker_data_consistency'] = worker_class.get_data_consistency
+
           return if worker_class.get_data_consistency == :always
 
           if Session.current.performed_write?

ee/lib/gitlab/database/load_balancing/sidekiq_server_middleware.rb

@@ -25,18 +25,18 @@ module Gitlab
 
         def requires_primary?(worker_class, job)
           return true unless worker_class.include?(::ApplicationWorker)
-
-          job[:worker_data_consistency] = worker_class.get_data_consistency
-
           return true if worker_class.get_data_consistency == :always
           return true unless worker_class.get_data_consistency_feature_flag_enabled?
 
-          if job['database_replica_location'] || replica_caught_up?(job['database_write_location'] )
+          if job['database_replica_location'] || replica_caught_up?(job['database_write_location'])
+            job[:database_chosen] = 'replica'
             false
           elsif worker_class.get_data_consistency == :delayed && job['retry_count'].to_i == 0
+            job[:database_chosen] = 'retry'
             raise JobReplicaNotUpToDate, "Sidekiq job #{worker_class} JID-#{job['jid']} couldn't use the replica."\
                "  Replica was not up to date."
           else
+            job[:database_chosen] = 'primary'
             true
           end
         end

ee/spec/lib/ee/gitlab/sidekiq_middleware/server_metrics_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+# rubocop: disable RSpec/MultipleMemoizedHelpers
+RSpec.describe Gitlab::SidekiqMiddleware::ServerMetrics do
+  using RSpec::Parameterized::TableSyntax
+
+  subject { described_class.new }
+
+  let(:queue) { :test }
+  let(:worker_class) { worker.class }
+  let(:job) { {} }
+  let(:job_status) { :done }
+  let(:labels_with_job_status) { default_labels.merge(job_status: job_status.to_s) }
+  let(:default_labels) do
+    { queue: queue.to_s,
+      worker: worker_class.to_s,
+      boundary: "",
+      external_dependencies: "no",
+      feature_category: "",
+      urgency: "low" }
+  end
+
+  before do
+    stub_const('TestWorker', Class.new)
+    TestWorker.class_eval do
+      include Sidekiq::Worker
+      include WorkerAttributes
+    end
+  end
+
+  let(:worker) { TestWorker.new }
+
+  include_context 'server metrics with mocked prometheus'
+
+  context 'when load_balancing is enabled' do
+    let(:load_balancing_metric) { double('load balancing metric') }
+
+    include_context 'clear DB Load Balancing configuration'
+
+    before do
+      allow(::Gitlab::Database::LoadBalancing).to receive(:enable?).and_return(true)
+      allow(Gitlab::Metrics).to receive(:counter).with(:sidekiq_load_balancing_count, anything).and_return(load_balancing_metric)
+    end
+
+    describe '#initialize' do
+      it 'sets load_balancing metrics' do
+        expect(Gitlab::Metrics).to receive(:counter).with(:sidekiq_load_balancing_count, anything).and_return(load_balancing_metric)
+
+        subject
+      end
+    end
+
+    describe '#call' do
+      include_context 'server metrics call'
+
+      context 'when :database_chosen is provided' do
+        where(:database_chosen) do
+          %w[primary retry replica]
+        end
+
+        with_them do
+          context "when #{params[:database_chosen]} is used" do
+            let(:labels_with_load_balancing) do
+              labels_with_job_status.merge(database_chosen: database_chosen, data_consistency: 'delayed')
+            end
+
+            before do
+              job[:database_chosen] = database_chosen
+              job[:data_consistency] = 'delayed'
+              allow(load_balancing_metric).to receive(:increment)
+            end
+
+            it 'increment sidekiq_load_balancing_count' do
+              expect(load_balancing_metric).to receive(:increment).with(labels_with_load_balancing, 1)
+
+              described_class.new.call(worker, job, :test) { nil }
+            end
+          end
+        end
+      end
+
+      context 'when :database_chosen is not provided' do
+        it 'does not increment sidekiq_load_balancing_count' do
+          expect(load_balancing_metric).not_to receive(:increment)
+
+          described_class.new.call(worker, job, :test) { nil }
+        end
+      end
+    end
+  end
+
+  context 'when load_balancing is disabled' do
+    include_context 'clear DB Load Balancing configuration'
+
+    before do
+      allow(::Gitlab::Database::LoadBalancing).to receive(:enable?).and_return(false)
+    end
+
+    describe '#initialize' do
+      it 'doesnt set load_balancing metrics' do
+        expect(Gitlab::Metrics).not_to receive(:counter).with(:sidekiq_load_balancing_count, anything)
+
+        subject
+      end
+    end
+  end
+end

lib/gitlab/sidekiq_middleware/instrumentation_logger.rb

@@ -13,7 +13,6 @@ module Gitlab
           :elasticsearch_calls,
           :elasticsearch_duration_s,
           :elasticsearch_timed_out_count,
-          :worker_data_consistency,
           *::Gitlab::Memory::Instrumentation::KEY_MAPPING.values,
           *::Gitlab::Instrumentation::Redis.known_payload_keys,
           *::Gitlab::Metrics::Subscribers::ActiveRecord.known_payload_keys,

lib/gitlab/sidekiq_middleware/server_metrics.rb

@@ -21,6 +21,16 @@ module Gitlab
         Thread.current.name ||= Gitlab::Metrics::Samplers::ThreadsSampler::SIDEKIQ_WORKER_THREAD_NAME
 
         labels = create_labels(worker.class, queue, job)
+        instrument(job, labels) do
+          yield
+        end
+      end
+
+      protected
+
+      attr_reader :metrics
+
+      def instrument(job, labels)
         queue_duration = ::Gitlab::InstrumentationHelper.queue_duration_for_job(job)
 
         @metrics[:sidekiq_jobs_queue_duration_seconds].observe(labels, queue_duration) if queue_duration
@@ -62,8 +72,6 @@ module Gitlab
         end
       end
 
-      private
-
       def init_metrics
         {
           sidekiq_jobs_cpu_seconds:                ::Gitlab::Metrics.histogram(:sidekiq_jobs_cpu_seconds, 'Seconds of cpu time to run Sidekiq job', {}, SIDEKIQ_LATENCY_BUCKETS),
@@ -82,6 +90,8 @@ module Gitlab
         }
       end
 
+      private
+
       def get_thread_cputime
         defined?(Process::CLOCK_THREAD_CPUTIME_ID) ? Process.clock_gettime(Process::CLOCK_THREAD_CPUTIME_ID) : 0
       end
@@ -108,3 +118,5 @@ module Gitlab
     end
   end
 end
+
+Gitlab::SidekiqMiddleware::ServerMetrics.prepend_if_ee('EE::Gitlab::SidekiqMiddleware::ServerMetrics')

spec/lib/gitlab/sidekiq_middleware/client_metrics_spec.rb

@@ -3,22 +3,7 @@
 require 'spec_helper'
 
 RSpec.describe Gitlab::SidekiqMiddleware::ClientMetrics do
-  context "with worker attribution" do
-    subject { described_class.new }
-
-    let(:queue) { :test }
-    let(:worker_class) { worker.class }
-    let(:job) { {} }
-    let(:default_labels) do
-      { queue: queue.to_s,
-        worker: worker_class.to_s,
-        boundary: "",
-        external_dependencies: "no",
-        feature_category: "",
-        urgency: "low" }
-    end
-
-    shared_examples "a metrics client middleware" do
+  shared_examples "a metrics middleware" do
     context "with mocked prometheus" do
       let(:enqueued_jobs_metric) { double('enqueued jobs metric', increment: true) }
 
@@ -46,113 +31,5 @@ RSpec.describe Gitlab::SidekiqMiddleware::ClientMetrics do
     end
   end
 
-    context "when workers are not attributed" do
-      before do
-        stub_const('TestNonAttributedWorker', Class.new)
-        TestNonAttributedWorker.class_eval do
-          include Sidekiq::Worker
-        end
-      end
-
-      it_behaves_like "a metrics client middleware" do
-        let(:worker) { TestNonAttributedWorker.new }
-        let(:labels) { default_labels.merge(urgency: "") }
-      end
-    end
-
-    context "when a worker is wrapped into ActiveJob" do
-      before do
-        stub_const('TestWrappedWorker', Class.new)
-        TestWrappedWorker.class_eval do
-          include Sidekiq::Worker
-        end
-      end
-
-      it_behaves_like "a metrics client middleware" do
-        let(:job) do
-          {
-            "class" => ActiveJob::QueueAdapters::SidekiqAdapter::JobWrapper,
-            "wrapped" => TestWrappedWorker
-          }
-        end
-
-        let(:worker) { TestWrappedWorker.new }
-        let(:labels) { default_labels.merge(urgency: "") }
-      end
-    end
-
-    context "when workers are attributed" do
-      def create_attributed_worker_class(urgency, external_dependencies, resource_boundary, category)
-        klass = Class.new do
-          include Sidekiq::Worker
-          include WorkerAttributes
-
-          urgency urgency if urgency
-          worker_has_external_dependencies! if external_dependencies
-          worker_resource_boundary resource_boundary unless resource_boundary == :unknown
-          feature_category category unless category.nil?
-        end
-        stub_const("TestAttributedWorker", klass)
-      end
-
-      let(:urgency) { nil }
-      let(:external_dependencies) { false }
-      let(:resource_boundary) { :unknown }
-      let(:feature_category) { nil }
-      let(:worker_class) { create_attributed_worker_class(urgency, external_dependencies, resource_boundary, feature_category) }
-      let(:worker) { worker_class.new }
-
-      context "high urgency" do
-        it_behaves_like "a metrics client middleware" do
-          let(:urgency) { :high }
-          let(:labels) { default_labels.merge(urgency: "high") }
-        end
-      end
-
-      context "no urgency" do
-        it_behaves_like "a metrics client middleware" do
-          let(:urgency) { :throttled }
-          let(:labels) { default_labels.merge(urgency: "throttled") }
-        end
-      end
-
-      context "external dependencies" do
-        it_behaves_like "a metrics client middleware" do
-          let(:external_dependencies) { true }
-          let(:labels) { default_labels.merge(external_dependencies: "yes") }
-        end
-      end
-
-      context "cpu boundary" do
-        it_behaves_like "a metrics client middleware" do
-          let(:resource_boundary) { :cpu }
-          let(:labels) { default_labels.merge(boundary: "cpu") }
-        end
-      end
-
-      context "memory boundary" do
-        it_behaves_like "a metrics client middleware" do
-          let(:resource_boundary) { :memory }
-          let(:labels) { default_labels.merge(boundary: "memory") }
-        end
-      end
-
-      context "feature category" do
-        it_behaves_like "a metrics client middleware" do
-          let(:feature_category) { :authentication }
-          let(:labels) { default_labels.merge(feature_category: "authentication") }
-        end
-      end
-
-      context "combined" do
-        it_behaves_like "a metrics client middleware" do
-          let(:urgency) { :high }
-          let(:external_dependencies) { true }
-          let(:resource_boundary) { :cpu }
-          let(:feature_category) { :authentication }
-          let(:labels) { default_labels.merge(urgency: "high", external_dependencies: "yes", boundary: "cpu", feature_category: "authentication") }
-        end
-      end
-    end
-  end
+  it_behaves_like 'metrics middleware with worker attribution'
 end

spec/lib/gitlab/sidekiq_middleware/instrumentation_logger_spec.rb

@@ -35,7 +35,6 @@ RSpec.describe Gitlab::SidekiqMiddleware::InstrumentationLogger do
         :elasticsearch_calls,
         :elasticsearch_duration_s,
         :elasticsearch_timed_out_count,
-        :worker_data_consistency,
         :mem_objects,
         :mem_bytes,
         :mem_mallocs,

spec/lib/gitlab/sidekiq_middleware_spec.rb

@@ -69,11 +69,13 @@ RSpec.describe Gitlab::SidekiqMiddleware do
     shared_examples "a server middleware chain" do
       it "passes through the right server middlewares" do
         enabled_sidekiq_middlewares.each do |middleware|
-          expect_any_instance_of(middleware).to receive(:call).with(*middleware_expected_args).once.and_call_original
+          expect_next_instance_of(middleware) do |middleware_instance|
+            expect(middleware_instance).to receive(:call).with(*middleware_expected_args).once.and_call_original
+          end
         end
 
         disabled_sidekiq_middlewares.each do |middleware|
-          expect_any_instance_of(middleware).not_to receive(:call)
+          expect(middleware).not_to receive(:new)
         end
 
         worker_class.perform_async(*job_args)

spec/support/shared_contexts/lib/gitlab/sidekiq_middleware/server_metrics_shared_context.rb

+# frozen_string_literal: true
+
+RSpec.shared_context 'server metrics with mocked prometheus' do
+  let(:concurrency_metric) { double('concurrency metric') }
+
+  let(:queue_duration_seconds) { double('queue duration seconds metric') }
+  let(:completion_seconds_metric) { double('completion seconds metric') }
+  let(:user_execution_seconds_metric) { double('user execution seconds metric') }
+  let(:db_seconds_metric) { double('db seconds metric') }
+  let(:gitaly_seconds_metric) { double('gitaly seconds metric') }
+  let(:failed_total_metric) { double('failed total metric') }
+  let(:retried_total_metric) { double('retried total metric') }
+  let(:redis_requests_total) { double('redis calls total metric') }
+  let(:running_jobs_metric) { double('running jobs metric') }
+  let(:redis_seconds_metric) { double('redis seconds metric') }
+  let(:elasticsearch_seconds_metric) { double('elasticsearch seconds metric') }
+  let(:elasticsearch_requests_total) { double('elasticsearch calls total metric') }
+
+  before do
+    allow(Gitlab::Metrics).to receive(:histogram).with(:sidekiq_jobs_queue_duration_seconds, anything, anything, anything).and_return(queue_duration_seconds)
+    allow(Gitlab::Metrics).to receive(:histogram).with(:sidekiq_jobs_completion_seconds, anything, anything, anything).and_return(completion_seconds_metric)
+    allow(Gitlab::Metrics).to receive(:histogram).with(:sidekiq_jobs_cpu_seconds, anything, anything, anything).and_return(user_execution_seconds_metric)
+    allow(Gitlab::Metrics).to receive(:histogram).with(:sidekiq_jobs_db_seconds, anything, anything, anything).and_return(db_seconds_metric)
+    allow(Gitlab::Metrics).to receive(:histogram).with(:sidekiq_jobs_gitaly_seconds, anything, anything, anything).and_return(gitaly_seconds_metric)
+    allow(Gitlab::Metrics).to receive(:histogram).with(:sidekiq_redis_requests_duration_seconds, anything, anything, anything).and_return(redis_seconds_metric)
+    allow(Gitlab::Metrics).to receive(:histogram).with(:sidekiq_elasticsearch_requests_duration_seconds, anything, anything, anything).and_return(elasticsearch_seconds_metric)
+    allow(Gitlab::Metrics).to receive(:counter).with(:sidekiq_jobs_failed_total, anything).and_return(failed_total_metric)
+    allow(Gitlab::Metrics).to receive(:counter).with(:sidekiq_jobs_retried_total, anything).and_return(retried_total_metric)
+    allow(Gitlab::Metrics).to receive(:counter).with(:sidekiq_redis_requests_total, anything).and_return(redis_requests_total)
+    allow(Gitlab::Metrics).to receive(:counter).with(:sidekiq_elasticsearch_requests_total, anything).and_return(elasticsearch_requests_total)
+    allow(Gitlab::Metrics).to receive(:gauge).with(:sidekiq_running_jobs, anything, {}, :all).and_return(running_jobs_metric)
+    allow(Gitlab::Metrics).to receive(:gauge).with(:sidekiq_concurrency, anything, {}, :all).and_return(concurrency_metric)
+
+    allow(concurrency_metric).to receive(:set)
+  end
+end
+
+RSpec.shared_context 'server metrics call' do
+  let(:thread_cputime_before) { 1 }
+  let(:thread_cputime_after) { 2 }
+  let(:thread_cputime_duration) { thread_cputime_after - thread_cputime_before }
+
+  let(:monotonic_time_before) { 11 }
+  let(:monotonic_time_after) { 20 }
+  let(:monotonic_time_duration) { monotonic_time_after - monotonic_time_before }
+
+  let(:queue_duration_for_job) { 0.01 }
+
+  let(:db_duration) { 3 }
+  let(:gitaly_duration) { 4 }
+
+  let(:redis_calls) { 2 }
+  let(:redis_duration) { 0.01 }
+
+  let(:elasticsearch_calls) { 8 }
+  let(:elasticsearch_duration) { 0.54 }
+  let(:instrumentation) do
+    {
+      gitaly_duration_s: gitaly_duration,
+      redis_calls: redis_calls,
+      redis_duration_s: redis_duration,
+      elasticsearch_calls: elasticsearch_calls,
+      elasticsearch_duration_s: elasticsearch_duration
+    }
+  end
+
+  before do
+    allow(subject).to receive(:get_thread_cputime).and_return(thread_cputime_before, thread_cputime_after)
+    allow(Gitlab::Metrics::System).to receive(:monotonic_time).and_return(monotonic_time_before, monotonic_time_after)
+    allow(Gitlab::InstrumentationHelper).to receive(:queue_duration_for_job).with(job).and_return(queue_duration_for_job)
+    allow(ActiveRecord::LogSubscriber).to receive(:runtime).and_return(db_duration * 1000)
+
+    job[:instrumentation] = instrumentation
+    job[:gitaly_duration_s] = gitaly_duration
+    job[:redis_calls] = redis_calls
+    job[:redis_duration_s] = redis_duration
+
+    job[:elasticsearch_calls] = elasticsearch_calls
+    job[:elasticsearch_duration_s] = elasticsearch_duration
+
+    allow(running_jobs_metric).to receive(:increment)
+    allow(redis_requests_total).to receive(:increment)
+    allow(elasticsearch_requests_total).to receive(:increment)
+    allow(queue_duration_seconds).to receive(:observe)
+    allow(user_execution_seconds_metric).to receive(:observe)
+    allow(db_seconds_metric).to receive(:observe)
+    allow(gitaly_seconds_metric).to receive(:observe)
+    allow(completion_seconds_metric).to receive(:observe)
+    allow(redis_seconds_metric).to receive(:observe)
+    allow(elasticsearch_seconds_metric).to receive(:observe)
+  end
+end

spec/support/shared_examples/lib/gitlab/sidekiq_middleware/metrics_middleware_with_worker_attribution_shared_examples.rb

+# frozen_string_literal: true
+
+RSpec.shared_examples 'metrics middleware with worker attribution' do
+  subject { described_class.new }
+
+  let(:queue) { :test }
+  let(:worker_class) { worker.class }
+  let(:job) { {} }
+  let(:default_labels) do
+    { queue: queue.to_s,
+      worker: worker_class.to_s,
+      boundary: "",
+      external_dependencies: "no",
+      feature_category: "",
+      urgency: "low" }
+  end
+
+  context "when workers are not attributed" do
+    before do
+      stub_const('TestNonAttributedWorker', Class.new)
+      TestNonAttributedWorker.class_eval do
+        include Sidekiq::Worker
+      end
+    end
+
+    it_behaves_like "a metrics middleware" do
+      let(:worker) { TestNonAttributedWorker.new }
+      let(:labels) { default_labels.merge(urgency: "") }
+    end
+  end
+
+  context "when a worker is wrapped into ActiveJob" do
+    before do
+      stub_const('TestWrappedWorker', Class.new)
+      TestWrappedWorker.class_eval do
+        include Sidekiq::Worker
+      end
+    end
+
+    it_behaves_like "a metrics middleware" do
+      let(:job) do
+        {
+          "class" => ActiveJob::QueueAdapters::SidekiqAdapter::JobWrapper,
+          "wrapped" => TestWrappedWorker
+        }
+      end
+
+      let(:worker) { TestWrappedWorker.new }
+      let(:labels) { default_labels.merge(urgency: "") }
+    end
+  end
+
+  context "when workers are attributed" do
+    def create_attributed_worker_class(urgency, external_dependencies, resource_boundary, category)
+      klass = Class.new do
+        include Sidekiq::Worker
+        include WorkerAttributes
+
+        urgency urgency if urgency
+        worker_has_external_dependencies! if external_dependencies
+        worker_resource_boundary resource_boundary unless resource_boundary == :unknown
+        feature_category category unless category.nil?
+      end
+      stub_const("TestAttributedWorker", klass)
+    end
+
+    let(:urgency) { nil }
+    let(:external_dependencies) { false }
+    let(:resource_boundary) { :unknown }
+    let(:feature_category) { nil }
+    let(:worker_class) { create_attributed_worker_class(urgency, external_dependencies, resource_boundary, feature_category) }
+    let(:worker) { worker_class.new }
+
+    context "high urgency" do
+      it_behaves_like "a metrics middleware" do
+        let(:urgency) { :high }
+        let(:labels) { default_labels.merge(urgency: "high") }
+      end
+    end
+
+    context "no urgency" do
+      it_behaves_like "a metrics middleware" do
+        let(:urgency) { :throttled }
+        let(:labels) { default_labels.merge(urgency: "throttled") }
+      end
+    end
+
+    context "external dependencies" do
+      it_behaves_like "a metrics middleware" do
+        let(:external_dependencies) { true }
+        let(:labels) { default_labels.merge(external_dependencies: "yes") }
+      end
+    end
+
+    context "cpu boundary" do
+      it_behaves_like "a metrics middleware" do
+        let(:resource_boundary) { :cpu }
+        let(:labels) { default_labels.merge(boundary: "cpu") }
+      end
+    end
+
+    context "memory boundary" do
+      it_behaves_like "a metrics middleware" do
+        let(:resource_boundary) { :memory }
+        let(:labels) { default_labels.merge(boundary: "memory") }
+      end
+    end
+
+    context "feature category" do
+      it_behaves_like "a metrics middleware" do
+        let(:feature_category) { :authentication }
+        let(:labels) { default_labels.merge(feature_category: "authentication") }
+      end
+    end
+
+    context "combined" do
+      it_behaves_like "a metrics middleware" do
+        let(:urgency) { :high }
+        let(:external_dependencies) { true }
+        let(:resource_boundary) { :cpu }
+        let(:feature_category) { :authentication }
+        let(:labels) do
+          default_labels.merge(
+            urgency: "high",
+            external_dependencies: "yes",
+            boundary: "cpu",
+            feature_category: "authentication")
+        end
+      end
+    end
+  end
+end