Disable dag feature flag by default

We decided to disable the feature flag
on the dag tab by default, and we are
going to enable it only for .com.
I also updated the doc to reflect
this change.

app/controllers/projects/pipelines_controller.rb

@@ -13,7 +13,7 @@ class Projects::PipelinesController < Projects::ApplicationController
   before_action do
     push_frontend_feature_flag(:junit_pipeline_view, project)
     push_frontend_feature_flag(:filter_pipelines_search, project, default_enabled: true)
-    push_frontend_feature_flag(:dag_pipeline_tab, project, default_enabled: true)
+    push_frontend_feature_flag(:dag_pipeline_tab, project, default_enabled: false)
     push_frontend_feature_flag(:pipelines_security_report_summary, project)
   end
   before_action :ensure_pipeline, only: [:show]

app/views/projects/pipelines/_with_tabs.html.haml

 - test_reports_enabled = Feature.enabled?(:junit_pipeline_view, @project)
-- dag_pipeline_tab_enabled = Feature.enabled?(:dag_pipeline_tab, @project, default_enabled: true)
+- dag_pipeline_tab_enabled = Feature.enabled?(:dag_pipeline_tab, @project, default_enabled: false)
 
 .tabs-holder
   %ul.pipelines-tabs.nav-links.no-top.no-bottom.mobile-separator.nav.nav-tabs

doc/ci/directed_acyclic_graph/index.md

@@ -82,11 +82,10 @@ are certain use cases that you may need to work around. For more information:
 ## DAG Visualization
 
 > - [Introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/215517) in GitLab 13.1 as a [Beta feature](https://about.gitlab.com/handbook/product/#beta).
-> - It's deployed behind a feature flag, enabled by default.
+> - It's deployed behind a feature flag, disabled by default.
 > - It's enabled on GitLab.com.
-> - It's not able to be enabled or disabled per-project
 > - It's not recommended for production use.
-> - For GitLab self-managed instances, GitLab administrators can opt to [disable it](#enable-or-disable-dag-visualization-core-only)
+> - For GitLab self-managed instances, GitLab administrators can opt to [enable it](#enable-or-disable-dag-visualization-core-only)
 
 The DAG visualization makes it easier to visualize the relationships between dependent jobs in a DAG. This graph will display all the jobs in a pipeline that need or are needed by other jobs. Jobs with no relationships are not displayed in this view.
 
@@ -100,20 +99,20 @@ Clicking a node will highlight all the job paths it depends on.
 
 DAG Visualization is under development and requires more testing, but is being made available as a beta features so users can check its limitations and uses.
 
-It is deployed behind a feature flag that is **enabled by default**.
+It is deployed behind a feature flag that is **disabled by default**.
 [GitLab administrators with access to the GitLab Rails console](../../administration/feature_flags.md)
-can opt to disable it for your instance.
+can opt to enable it for your instance.
 
 ```ruby
-# To disable it globally
-Feature.disable(:dag_pipeline_tab)
-
 # To force-enable it globally
 Feature.enable(:dag_pipeline_tab)
 
 # To Enable DAG tab only on a specific project, disabling it system-wide
 Feature.enable(:dag_pipeline_tab, Project.find_by_full_path("gitlab-org/gitlab"))
 
+# To disable it globally
+Feature.disable(:dag_pipeline_tab)
+
 # To revert to default
 Feature.remove(:dag_pipeline_tab)
 ```