The Prometheus node_exporter host agent is written in Go, and Go
doesn't currently support the SPARC architecture (and is unlikely to
do so in the future). So there is no node_exporter package possible
for Solaris on SPARC (from anyone, official or otherwise). You'll need
to explore alternate host agents (such as the one mentioned by Evelyn
Pereira Souza).
The node_exporter does have some support for Solaris on x86 (probably
64-bit only), and along with it Illumos-based Unixes on x86. I suspect
that Illumos-based Unixes are better tested than Solaris 10 or 11 is.
Go itself is fully supported on x86 Solaris/Illumos, but I don't think
node_exporter has been augmented to collect all of the possible kernel
and other statistics.
- cks