Log events for external pipeline validation

lib/gitlab/ci/pipeline/chain/validate/external.rb

@@ -13,7 +13,12 @@ module Gitlab
             VALIDATION_REQUEST_TIMEOUT = 5
 
             def perform!
-              error('External validation failed', drop_reason: :external_validation_failure) unless validate_external
+              pipeline_authorized = validate_external
+
+              log_message = pipeline_authorized ? 'authorized' : 'not authorized'
+              Gitlab::AppLogger.info(message: "Pipeline #{log_message}", project_id: @pipeline.project.id, user_id: @pipeline.user.id)
+
+              error('External validation failed', drop_reason: :external_validation_failure) unless pipeline_authorized
             end
 
             def break?

spec/lib/gitlab/ci/pipeline/chain/validate/external_spec.rb

@@ -67,6 +67,12 @@ describe Gitlab::Ci::Pipeline::Chain::Validate::External do
 
         expect(step.break?).to be false
       end
+
+      it 'logs the authorization' do
+        expect(Gitlab::AppLogger).to receive(:info).with(message: 'Pipeline authorized', project_id: project.id, user_id: user.id)
+
+        perform!
+      end
     end
 
     context 'when validation return false' do
@@ -86,6 +92,12 @@ describe Gitlab::Ci::Pipeline::Chain::Validate::External do
 
         expect(step.break?).to be true
       end
+
+      it 'logs the authorization' do
+        expect(Gitlab::AppLogger).to receive(:info).with(message: 'Pipeline not authorized', project_id: project.id, user_id: user.id)
+
+        perform!
+      end
     end
   end