prometheus metric naming best practices not followed

[perkons]

I'm submitting a ...

• bug report
• feature request

What is the current behavior?

The metric name "oracledb_tablespace_free" does not follow the Prometheus naming best practices documented here: https://prometheus.io/docs/practices/naming/

A change would need to be done in the following lines:
https://github.com/iamseth/oracledb_exporter/blob/master/default-metrics.toml#L48
https://github.com/iamseth/oracledb_exporter/blob/master/default-metrics.toml#L55
I am not sure about this line https://github.com/iamseth/oracledb_exporter/blob/master/default-metrics.toml#L17 but it looks like this one too should be "free_bytes"

What is the expected behavior?

Expected metric name would be "oracledb_tablespace_free_bytes"

[Yannig]

Hi,

The name is quite old. If we change it, it will broke existing dashboards.

But you can do a PR if you want to change it.