Node agnostic support for gliveview

[jeluard]

It would be nice to support amaru as well as any other tool that export the expected prometheus metrics.

This is currently not doable due to some internal assumptions related to cardano-node specifics:

• version checks
• liveness check of cardano-node process
• lack of support of prometheus metric values exported with exponent (part of specs; go tooling do that by default)

Could we envision changes that would help support other nodes implementations?

For the record, amaru patches gliveview in this way for local testing.

[rdlrt]

Absolutely - we'd welcome PRs for cross node compatibility - (if not, would work on it ourselves once possible).