New Prometheus metrics for blobpool are not formatted correctly.

[imulmat4]

System information

Geth version: 1.12.1
CL client & version: e.g. lighthouse/nimbus/prysm@v1.0.0
OS & Version: Windows/Linux/OS1.12.
Commit hash : (if develop)

Expected behaviour

Prometheus metrics are formatted in the correct format with underscores and not hyphens.

Actual behaviour

All the new blobpool metircs have a - and that breaks all the Prometheus scrapers since prometheus doesnt support hyphen metric names. Error I am getting:
Error reading metrics for "http://127.0.0.1:6000/debug/metrics/prometheus": reading text format failed: text format parsing error in line 66: invalid metric name in comment

Steps to reproduce the behaviour

Just run geth on version 1.12.1

Backtrace

[backtrace]

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[imulmat4]

I opened #27901 which should fix the above, but not sure if I am missing more context

[karalabe]

Thanks PR looked good.