Remove the FF ci_trigger_payload_into_pipeline

It has been enabled for a milestone

app/services/ci/pipeline_trigger_service.rb

@@ -73,11 +73,7 @@ def job_from_token
     end
     def variables
-      if ::Feature.enabled?(:ci_trigger_payload_into_pipeline, project, default_enabled: :yaml)
-        param_variables + [payload_variable]
-      else
-        param_variables
-      end
+      param_variables + [payload_variable]
     end
     def param_variables

changelogs/unreleased/321027-remove-ci_trigger_payload_into_pipeline.yml

+---
+title: Remove the FF ci_trigger_payload_into_pipeline
+merge_request: 57087
+author:
+type: other

config/feature_flags/development/ci_trigger_payload_into_pipeline.yml

----
-name: ci_trigger_payload_into_pipeline
-introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/53837
-rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/321027
-milestone: '13.9'
-type: development
-group: group::pipeline authoring
-default_enabled: true

doc/ci/triggers/README.md

@@ -188,38 +188,13 @@ source repository. Be sure to URL-encode `ref` if it contains slashes.
 ### Using webhook payload in the triggered pipeline
 > - [Introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/31197) in GitLab 13.9.
-> - It's [deployed behind a feature flag](../../user/feature_flags.md), enabled by default.
-> - It's enabled on GitLab.com.
-> - It's recommended for production use.
-> - For GitLab self-managed instances, GitLab administrators can opt to [disable it](#enable-or-disable-the-trigger_payload-variable). **(FREE SELF)**
-
-WARNING:
-This feature might not be available to you. Check the **version history** note above for details.
+> - [Feature flag removed](https://gitlab.com/gitlab-org/gitlab/-/issues/321027) in GitLab 13.11.
 If you trigger a pipeline by using a webhook, you can access the webhook payload with
 the `TRIGGER_PAYLOAD` [predefined CI/CD variable](../variables/predefined_variables.md).
 The payload is exposed as a [file-type variable](../variables/README.md#custom-cicd-variables-of-type-file),
 so you can access the data with `cat $TRIGGER_PAYLOAD` or a similar command.
-#### Enable or disable the `TRIGGER_PAYLOAD` variable
-
-The `TRIGGER_PAYLOAD` CI/CD variable is under development but ready for production use.
-It is deployed behind a feature flag that is **enabled by default**.
-[GitLab administrators with access to the GitLab Rails console](../../administration/feature_flags.md)
-can opt to disable it.
-
-To disable it:
-
-```ruby
-Feature.disable(:ci_trigger_payload_into_pipeline)
-```
-
-To enable it:
-
-```ruby
-Feature.enable(:ci_trigger_payload_into_pipeline)
-```
-
 ## Making use of trigger variables
 You can pass any number of arbitrary variables in the trigger API call and they

spec/services/ci/pipeline_trigger_service_spec.rb

@@ -55,17 +55,6 @@
             expect(var.variable_type).to eq('file')
           end
-          context 'when FF ci_trigger_payload_into_pipeline is disabled' do
-            before do
-              stub_feature_flags(ci_trigger_payload_into_pipeline: false)
-            end
-
-            it 'does not store the payload as a variable' do
-              expect { result }.not_to change { Ci::PipelineVariable.count }
-              expect(result[:pipeline].variables).to be_empty
-            end
-          end
-
           context 'when commit message has [ci skip]' do
             before do
               allow_next(Ci::Pipeline).to receive(:git_commit_message) { '[ci skip]' }