Zarcillo
https://zarcillo.wikimedia.org/ is a tool that displays information about Wikimedia MariaDB shards and servers. Unlike Orchestrator, it is publicly accessible.
A bit of history
Zarcillo has been authored originally with the ambition of being a single point of truth. As we know, this is a challenging assignment. Zarcillo is now used mostly for monitoring, but we are not certain of this. This page is to catalog Zarcillo usage, in the context of T377451.