It is basically a revamped Java.
replyGoogle lost the opportunity to actually make it take off, had they replaced the Java stack with Dart, instead of staying in the Java world and adopt Kotlin.
However the Android team was never a great supporter from Dart in first place, hence why you won't find anything Dart on https://developer.android.com.
They should have pushed dart instead of Go imo.
replyGoogle never pushed Go, the UNIX/Plan 9 and Oberon folks did, as means to avoid doing C++, with support of their line managers as their 20% project.
replyKubernetes was originally written in Java, and Docker in Python, it was thanks to early Go advocacy, that those projects got rewritten in Go, and then they got lucky.
Just like the download server rewrite into Go, that was done by someone from Go team, as part of their advocacy.
Check how many public projects does Google do, outside anything related to CNCF project landscape.