Enables ff by default

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

+---
+title: Enables multiple_cache_per_job feature flag by default
+merge_request: 59016
+author:
+type: added

config/feature_flags/development/multiple_cache_per_job.yml

@@ -5,4 +5,4 @@ rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/321877
 milestone: '13.10'
 type: development
 group: group::pipeline authoring
-default_enabled: false
+default_enabled: true

doc/ci/yaml/README.md

@@ -2884,14 +2884,12 @@ You can specify a [fallback cache key](#fallback-cache-key) to use if the specif
 
 ##### Multiple caches
 
-> - [Introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/32814) in GitLab 13.10.
-> - It's [deployed behind a feature flag](../../user/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-multiple-caches). **(FREE SELF)**
-
-WARNING:
-This feature might not be available to you. Check the **version history** note above for details.
+> - [Introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/32814) in GitLab 13.10,
+>   and disabled by default.
+> - Enabled by default in GitLab 13.11.
+> - Enabled on GitLab.com.
+> - Recommended for production use.
+> - For GitLab self-managed instances, GitLab administrators can opt to [disable it](#enable-or-disable-multiple-caches). **(FREE SELF)**
 
 You can have a maximum of four caches:
 
@@ -2920,10 +2918,10 @@ the fallback is fetched multiple times if multiple caches are not found.
 
 ##### Enable or disable multiple caches **(FREE SELF)**
 
-The multiple caches feature is under development and not ready for production use.
-It is deployed behind a feature flag that is **disabled by default**.
+The multiple caches feature 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:
 

lib/gitlab/ci/config/entry/cache.rb

@@ -8,8 +8,8 @@ module Gitlab
         # Entry that represents a cache configuration
         #
         class Cache < ::Gitlab::Config::Entry::Simplifiable
-          strategy :Caches, if: -> (config) { Feature.enabled?(:multiple_cache_per_job) }
-          strategy :Cache, if: -> (config) { Feature.disabled?(:multiple_cache_per_job) }
+          strategy :Caches, if: -> (config) { Feature.enabled?(:multiple_cache_per_job, default_enabled: :yaml) }
+          strategy :Cache, if: -> (config) { Feature.disabled?(:multiple_cache_per_job, default_enabled: :yaml) }
 
           class Caches < ::Gitlab::Config::Entry::ComposableArray
             include ::Gitlab::Config::Entry::Validatable