Merge branch 'zj-prom-pipeline-count' into 'master'

Add prometheus metrics on pipeline creation

Closes #32624

See merge request !11975

app/services/ci/create_pipeline_service.rb

@@ -57,6 +57,8 @@ module Ci
 
       cancel_pending_pipelines if project.auto_cancel_pending_pipelines?
 
+      pipeline_created_counter.increment(source: source)
+
       pipeline.tap(&:process!)
     end
 
@@ -131,5 +133,9 @@ module Ci
       pipeline.drop if save
       pipeline
     end
+
+    def pipeline_created_counter
+      @pipeline_created_counter ||= Gitlab::Metrics.counter(:pipelines_created_count, "Pipelines created count")
+    end
   end
 end

changelogs/unreleased/zj-prom-pipeline-count.yml

+---
+title: Add prometheus metrics on pipeline creation
+merge_request:
+author:

spec/services/ci/create_pipeline_service_spec.rb

@@ -38,6 +38,14 @@ describe Ci::CreatePipelineService, :services do
         expect(pipeline.builds.first).to be_kind_of(Ci::Build)
       end
 
+      it 'increments the prometheus counter' do
+        expect(Gitlab::Metrics).to receive(:counter)
+          .with(:pipelines_created_count, "Pipelines created count")
+          .and_call_original
+
+        pipeline
+      end
+
       context 'when merge requests already exist for this source branch' do
         it 'updates head pipeline of each merge request' do
           merge_request_1 = create(:merge_request, source_branch: 'master', target_branch: "branch_1", source_project: project)