Merge branch '199912-ff-enable-by-default' into 'master'

Enable async_merge_request_check_mergeability by default

See merge request gitlab-org/gitlab!31196

app/models/merge_request.rb

@@ -866,7 +866,7 @@ class MergeRequest < ApplicationRecord
 
     check_service = MergeRequests::MergeabilityCheckService.new(self)
 
-    if async && Feature.enabled?(:async_merge_request_check_mergeability, project)
+    if async && Feature.enabled?(:async_merge_request_check_mergeability, project, default_enabled: true)
       check_service.async_execute
     else
       check_service.execute(retry_lease: false)

changelogs/unreleased/199912-ff-enable-by-default.yml

+---
+title: Enable async_merge_request_check_mergeability by default
+merge_request: 31196
+author:
+type: other