Extract query variables into own module

changelogs/unreleased/7527-ci-variables-are-not-parameterized-for-alerting-rules-ce.yml

+---
+title: Extract into Gitlab::Prometheus::QueryVariables
+merge_request: 23335
+author:
+type: other

lib/gitlab/prometheus/queries/query_additional_metrics.rb

@@ -83,11 +83,8 @@ module Gitlab
         end
 
         def common_query_context(environment, timeframe_start:, timeframe_end:)
-          base_query_context(timeframe_start, timeframe_end).merge({
-            ci_environment_slug: environment.slug,
-            kube_namespace: environment.deployment_platform&.actual_namespace || '',
-            environment_filter: %{container_name!="POD",environment="#{environment.slug}"}
-          })
+          base_query_context(timeframe_start, timeframe_end)
+            .merge(QueryVariables.call(environment))
         end
 
         def base_query_context(timeframe_start, timeframe_end)

lib/gitlab/prometheus/query_variables.rb

+# frozen_string_literal: true
+
+module Gitlab
+  module Prometheus
+    module QueryVariables
+      def self.call(environment)
+        {
+          ci_environment_slug: environment.slug,
+          kube_namespace: environment.deployment_platform&.actual_namespace || '',
+          environment_filter: %{container_name!="POD",environment="#{environment.slug}"}
+        }
+      end
+    end
+  end
+end

spec/lib/gitlab/prometheus/query_variables_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe Gitlab::Prometheus::QueryVariables do
+  describe '.call' do
+    set(:environment) { create(:environment) }
+    let(:slug) { environment.slug }
+
+    subject { described_class.call(environment) }
+
+    it { is_expected.to include(ci_environment_slug: slug) }
+
+    it do
+      is_expected.to include(environment_filter:
+                             %{container_name!="POD",environment="#{slug}"})
+    end
+
+    context 'without deployment platform' do
+      it { is_expected.to include(kube_namespace: '') }
+    end
+
+    context 'with deplyoment platform' do
+      let(:kube_namespace) { environment.deployment_platform.actual_namespace }
+
+      before do
+        create(:cluster, :provided_by_user, projects: [environment.project])
+      end
+
+      it { is_expected.to include(kube_namespace: kube_namespace) }
+    end
+  end
+end