**Reason**
We've dropped use of this from MediaWiki ({T265967}). No other known users. It's a fork from apache/avro.
**To-do list**
- This task
-- [x] Add maintainers of the library as subscribers to this task.
- Upstream publication
-- [ ] Drop Packagist entry
- On-wiki documentation
-- ~~NA~~
- Phabricator
-- [x] Mark all Phabricator tasks for the extension/skin either Declined or Invalid. Add a comment pointing to this task when doing so for reference.
- Translatewiki.net/translations
-- ~~NA~~
- Configuration/tests/integrations/etc.
-- [x] Remove tests in [[ https://gerrit.wikimedia.org/g/integration/config | integration/config ]] ([[ https://gerrit.wikimedia.org/r/plugins/gitiles/integration/config/+/master/zuul/layout.yaml | zuul/layout.yaml ]]).
- Repositories
-- [x] Empty repository, leaving only the README indicating the repo is archived, and referring to this task by URL.
-- [x] Mark the repository read-only in Gerrit (also edit description to prepend "[ARCHIVED]" and a reference to this task): https://gerrit.wikimedia.org/r/admin/repos/avro-php
-- [x] Archive the Diffusion repository for the extension/skin: https://phabricator.wikimedia.org/diffusion/GAVP/
-- [x] Delete the GitHub mirror: https://github.com/wikimedia/avro-php
- Packagist
-- [ ] Mark the [[ https://packagist.org/packages/wikimedia/avro | package ]] as abandoned