**Entry in Developers/Maintainers with:**
On paper, the Readers Web team maintain the extension. In practice, Legoktm, MaxSem, and Jdlrobson. There are no maintainers in training.
**Number, severity, and age of known and confirmed security issues**
0, AFAICT.
**Was it a cause of production outages or incidents? List them.**
It's not clear, but there may have been a production outage when DMOZ support was disabled (https://gerrit.wikimedia.org/r/#/q/If1df8ac607186eaca0d63399fe933e5306e8f1e4) in March 2017.
**Does it have sufficient hardware resources for now and the near future (to take into account expected usage growth)?**
Yes.
**Is it a frequent cause of monitoring alerts that need action~~, and are they addressed timely and appropriately~~?**
No.
**When it was first deployed to Wikimedia production**
Circa October 2012.
**Usage statistics based on audience(s) served**
RelatedSites is [[ https://phabricator.wikimedia.org/source/mediawiki-config/browse/master/wmf-config/InitialiseSettings.php;81e06d9eaaeabf9a2a2384e93ed9769fb1737e56$17919 | currently configured ]] to search for interwiki links with the following prefixes: `'commons'`, `'dmoz'`, `'citizendium'`, and `'wikipedia'`.
There are approximately 24000 mainspace pages on Wikivoyage that contain at least one link with one of those prefixes:: https://en.wikivoyage.org/w/index.php?search=insource%3A%2F%5C%5B%5C%5B%28commons%7Cdmoz%7Ccitizendium%7Cwikipedia%29%2Fi&title=Special:Search&profile=default&fulltext=1&searchToken=3kfl6odi3301ewf84v58kj4s
[[ https://phabricator.wikimedia.org/source/mediawiki-config/browse/master/wmf-config/InitialiseSettings.php;81e06d9eaaeabf9a2a2384e93ed9769fb1737e56$17876 | Deployed to all wikis hosted by WMF but only enabled on Wikivoyage ]]. [[ https://wikiapiary.com/wiki/Extension:RelatedSites | It's deployed to one other wiki (standalone) according to WikiApiary ]].
**Changes committed in last 1, 3, 6, and 12 months**
**Number of developers who committed code in the last 1, 3, 6, and 12 months**
The following excludes i18n updates.
**1 month:**
N/A
**3 months:**
Umherirrender: https://gerrit.wikimedia.org/r/#/c/390827/
Legoktm: https://gerrit.wikimedia.org/r/#/c/388806/
Umherirrender: https://gerrit.wikimedia.org/r/#/c/382978/ – This also appears to be related to standardizing tooling across extensions.
**6 months:**
Hashar: https://gerrit.wikimedia.org/r/#/c/369273/
Legoktm: https://gerrit.wikimedia.org/r/#/c/367264/
**12 months:**
Umherirrender: [Add phpcs and make pass](https://gerrit.wikimedia.org/r/#/c/354243/)
Umherirrender: [Add php-parallel-lint](https://gerrit.wikimedia.org/r/#/c/352328/)
Hashar: [build: add grunt-contrib-jshint](https://gerrit.wikimedia.org/r/#/c/349669/)
MaxSem: https://gerrit.wikimedia.org/r/#/q/If1df8ac607186eaca0d63399fe933e5306e8f1e4
MaxSem: https://gerrit.wikimedia.org/r/#/q/I41f558211b7c37958e7b878c8de9a78a1ea56d55
**Reliance on outdated platforms (e.g. operating systems)**
None.
**Number ~~and age~~ of open patches**
None.
**Number and age of open bugs**
2
**Number of known dependencies?**
None.
**Is there a replacement/alternative for the feature? Is there a plan for a replacement?**
The ["Other projects sidebar" beta feature](https://www.mediawiki.org/wiki/Beta_Features/Other_projects_sidebar) could easily replace the RelatedSites extension (see {T2708} and {T103102}).
Relatedly, there's a task around de-deploying the RelatedSites extension, which appears to have stalled after some work, including tracking on-wiki discussions about de-deploying the extension: {T128326}.