There is also an article on Bitcoin Magazine with some additional information:
Gloria Zhao Becomes First Female Bitcoin Core Maintainer, Pieter Wuille Steps Down | Bitcoin Magazine
Who decides who gets to be a maintainer?
Is this voted via a dao or something?
What if i want to participate?
Here is a outstanding piece of content made by Amiti Uttarwar where she made a step-by-step guide of how to contribute. It's called Onboarding to Bitcoin Core
TL/DR: fork the Bitcoin Core, make tests, play with commands, assist to Bitcoin PR and start working.
Other maintainers I believe ... which is why it's a pretty big deal.
or just one maintainer
Who decides then?
I think cyclic was just saying that it only takes one maintainer to add another.
In our community, this is like someone being knighted.
Congratulations to her!