this is the one that got me started in low latency java a decade ago - http://blog.vanillajava.blog/ - I've spoken with Peter a couple of times, he's a phenomenal technologist
Some other great resources I used:
* http://psy-lob-saw.blogspot.com/ - Not updated since 2018, but still great stuff in there
* https://richardstartin.github.io/ - A few posts per year. Richard does a lot of interesting things.