Enable MR CSV Export

Puts export_merge_requests_as_csv behind a
default on feature-flag to enable
CSV export of merge requests

app/controllers/projects/merge_requests_controller.rb

@@ -319,7 +319,7 @@ class Projects::MergeRequestsController < Projects::MergeRequests::ApplicationCo
   end
 
   def export_csv
-    return render_404 unless Feature.enabled?(:export_merge_requests_as_csv, project)
+    return render_404 unless Feature.enabled?(:export_merge_requests_as_csv, project, default_enabled: true)
 
     IssuableExportCsvWorker.perform_async(:merge_request, current_user.id, project.id, finder_options.to_h) # rubocop:disable CodeReuse/Worker
 

app/views/projects/merge_requests/_nav_btns.html.haml

-- if Feature.enabled?(:export_merge_requests_as_csv, @project)
+- if Feature.enabled?(:export_merge_requests_as_csv, @project, default_enabled: true)
   .btn-group
     = render 'shared/issuable/csv_export/button', issuable_type: 'merge-requests'
 
@@ -8,5 +8,5 @@
   = link_to new_merge_request_path, class: "gl-button btn btn-success", title: "New merge request" do
     New merge request
 
-  - if Feature.enabled?(:export_merge_requests_as_csv, @project)
+  - if Feature.enabled?(:export_merge_requests_as_csv, @project, default_enabled: true)
     = render 'shared/issuable/csv_export/modal', issuable_type: 'merge_requests'

changelogs/unreleased/ff-export_merge_requests_as_csv-default-on.yml

+---
+title: Enable MR CSV export
+merge_request: 46662
+author:
+type: added

config/feature_flags/development/export_merge_requests_as_csv.yml

@@ -4,4 +4,4 @@ introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/45130
 rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/267129
 type: development
 group: group::compliance
-default_enabled: false
+default_enabled: true

doc/user/project/merge_requests/csv_export.md

@@ -7,10 +7,12 @@ info: To determine the technical writer assigned to the Stage/Group associated w
 # Export Merge Requests to CSV **(CORE)**
 
 > - [Introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/3619) in GitLab 13.6.
-> - It's [deployed behind a feature flag](../../../administration/feature_flags.md), disabled by default.
-> - It's disabled on GitLab.com.
-> - It's not recommended for production use.
-> - To use it in GitLab self-managed instances, ask a GitLab administrator to [enable it](#enable-or-disable-export-merge-requests-to-csv). **(CORE ONLY)**
+> - It was [deployed behind a feature flag](../../../administration/feature_flags.md), disabled by default.
+> - Became enabled by default in GitLab 13.6.
+> - 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-export-merge-requests-to-csv). **(CORE ONLY)**
+> - It can be enabled or disabled for a single project.
 
 CAUTION: **Warning:**
 This feature might not be available to you. Check the **version history** note above for details.
@@ -55,25 +57,25 @@ The following table shows what attributes will be present in the CSV.
 
 ### Enable or disable Export Merge Requests to CSV **(CORE ONLY)**
 
-Export merge requests to CSV is under development and not ready for production use. It is
-deployed behind a feature flag that is **disabled by default**.
+Export merge requests to CSV 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 enable it.
+can opt to disable it.
 
 To enable it:
 
 ```ruby
+# For the instance
 Feature.enable(:export_merge_requests_as_csv)
+# For a single project
+Feature.enable(:export_merge_requests_as_csv, Project.find(<project id>))
 ```
 
 To disable it:
 
 ```ruby
-Feature.enable(:export_merge_requests_as_csv)
-```
-
-Optionally, pass a project as an argument to enable for a single project.
-
-```ruby
-Feature.enable(:export_merge_requests_as_csv, project)
+# For the instance
+Feature.disable(:export_merge_requests_as_csv)
+# For a single project
+Feature.disable(:export_merge_requests_as_csv, Project.find(<project id>))
 ```