There's no reason for these to be separate packages. They come from the
same source tree, so having a single package makes more sense. I only
separated them originally because I wasn't sure exactly how to express
the proper options in the kconfig language.
The *vmutils* package can be built from source easily, as its just a
collection of Go applications. Grafana and Alertmanager are quite a bit
more complicated because of their respective browser applications. In
the interest of getting this project actually going, we'll just install
the official binary releases of these (for now?).
Victoria Metrics is not available by default with Buildroot, but adding
a package description for it is very straightforward. The flags and
tags are specified within Victoria Metrics's own Makefile.