Report summarized Gitaly Apdex via usage ping

Fetches average 1 week apdex from prometheus

changelogs/unreleased/gitaly_usage_data_apdex.yml

+---
+title: Report summarized Gitaly Apdex via usage ping
+merge_request: 47040
+author:
+type: added

config/metrics/settings/20210321224827_gitaly_apdex.yml

+---
+key_path: settings.gitaly_apdex
+description: Gitaly application performance
+product_section: dev
+product_stage: create
+product_group: group::gitaly
+product_category: gitaly
+value_type: number
+status: implemented
+milestone: "13.11"
+introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/47040
+time_frame: none
+data_source: prometheus
+distribution:
+- ce
+- ee
+tier:
+- free
+- premium
+- ultimate

doc/development/usage_ping/dictionary.md

@@ -14360,6 +14360,18 @@ Status: `data_available`
 
 Tiers: `free`, `premium`, `ultimate`
 
+### `settings.gitaly_apdex`
+
+Gitaly application performance
+
+[YAML definition](https://gitlab.com/gitlab-org/gitlab/-/blob/master/config/metrics/settings/20210321224827_gitaly_apdex.yml)
+
+Group: `group::gitaly`
+
+Status: `implemented`
+
+Tiers: `free`, `premium`, `ultimate`
+
 ### `settings.ldap_encrypted_secrets_enabled`
 
 Is encrypted LDAP secrets configured?

lib/gitlab/usage_data.rb

@@ -243,7 +243,8 @@ module Gitlab
         {
           settings: {
             ldap_encrypted_secrets_enabled: alt_usage_data(fallback: nil) { Gitlab::Auth::Ldap::Config.encrypted_secrets.active? },
-            operating_system: alt_usage_data(fallback: nil) { operating_system }
+            operating_system: alt_usage_data(fallback: nil) { operating_system },
+            gitaly_apdex: alt_usage_data { gitaly_apdex }
           }
         }
       end
@@ -767,6 +768,16 @@ module Gitlab
 
       private
 
+      def gitaly_apdex
+        with_prometheus_client(verify: false, fallback: FALLBACK) do |client|
+          result = client.query('avg_over_time(gitlab_usage_ping:gitaly_apdex:ratio_avg_over_time_5m[1w])').first
+
+          break FALLBACK unless result
+
+          result['value'].last.to_f
+        end
+      end
+
       def aggregated_metrics
         @aggregated_metrics ||= ::Gitlab::Usage::Metrics::Aggregates::Aggregate.new(recorded_at)
       end

spec/lib/gitlab/usage_data_spec.rb

@@ -1158,8 +1158,17 @@ RSpec.describe Gitlab::UsageData, :aggregate_failures do
     end
 
     describe ".system_usage_data_settings" do
+      let(:prometheus_client) { double(Gitlab::PrometheusClient) }
+
       before do
         allow(described_class).to receive(:operating_system).and_return('ubuntu-20.04')
+        expect(prometheus_client).to receive(:query).with(/gitlab_usage_ping:gitaly_apdex:ratio_avg_over_time_5m/).and_return([
+          {
+            'metric' => {},
+            'value' => [1616016381.473, '0.95']
+          }
+        ])
+        expect(described_class).to receive(:with_prometheus_client).and_yield(prometheus_client)
       end
 
       subject { described_class.system_usage_data_settings }
@@ -1171,6 +1180,10 @@ RSpec.describe Gitlab::UsageData, :aggregate_failures do
       it 'populates operating system information' do
         expect(subject[:settings][:operating_system]).to eq('ubuntu-20.04')
       end
+
+      it 'gathers gitaly apdex', :aggregate_failures do
+        expect(subject[:settings][:gitaly_apdex]).to be_within(0.001).of(0.95)
+      end
     end
   end