Pine W wrote:
I believe that Flow is being used on an opt-in basis on Wikidata and Catalan Wikipedia, and is used on user talk pages by default on MediaWiki.
Is that correct?
Are there any wikis other than MediaWiki where Flow is enabled on all talk pages by default?
Are there any wikis where Flow is widely used on an opt-in basis, even if it's not the default?
The Wikimedia wiki configuration files are published on the public Internet at https://noc.wikimedia.org/conf/.
https://noc.wikimedia.org/conf/InitialiseSettings.php.txt has a relevant section (lightly tweaked due to line wrapping):
--- 'wmgUseFlow' => [ 'default' => false, // This is computed in flow.dblist as all - "a specific list" // (nonflow.dblist) // - "all private wikis" (private.dblist) + "private wikis with Flow" // (flowprivate.dblist) 'flow' => true, ], ---
You can view these database lists. In particular, https://noc.wikimedia.org/conf/highlight.php?file=flow.dblist.
These configuration files are the canonical source of truth for what's enabled or disabled on Wikimedia wikis. There may be a nice manually updated table on mediawiki.org or meta.wikimedia.org that explains the status of Flow on various wikis.
You can verify whether Flow is installed on a specific wiki by visiting the page "Special:Version" on that wiki; for example: https://en.wikibooks.org/wiki/Special:Version lists "Flow".
This reply doesn't directly answer your questions about "opt-in" versus "all talk pages by default", but it should be a decent starting point to gather those answers as accurately as possible. For example, you can reference the "wmgFlowEnableOptInBetaFeature" configuration variable in InitialiseSettings.php.txt to see which wikis set this variable to true.
MZMcBride