The configuration is in CommonSettings.php (mediawiki-config.git) as part of a MultiWrite
- Cache retention period is set to (as of 2021-06-07 - see T282761):
- 21 days for wiki pages
- 10 days for talk pages
- Semi-random tasks from 2021 containing various current knowledge about parser cache: T282761.
- Grafana: Parser Cache
Prior to 2011, the parser cache was solely memcached-based.
In 2020, an additional local on-host Memcached tier was enabled for parser cache (T264604).