The issue
Per https://replag.toolforge.org/, the enwiki database lag is currently over 21 hours and steadily increasing.
What happens?:
Tools such as AFD stats and xtools which rely on database replicas are showing out-of-date information
What should have happened instead?:
Replica lag should be measured in seconds, not hours.
Other information:
This issue was reported by enwiki users Liz and Maile66, so please direct queries for more info to them. TheTechie may be able to provide more information.