add signer metrics api

[ryanwaits]

What does this PR do?

Add new Signer Metric API reference docs

Checklist

• Add to sidebar
• Generate reference pages

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Name	Status	Preview	Comments	Updated (UTC)
hiro-systems-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Dec 5, 2024 10:09pm

[max-crawford]

I updated the copy on the overview page. One thing to add @ryanwaits

I think we should add a third card to the overview page around the Prometheus metrics endpoint because that is how devs can query behavioral data around individual signers (if I'm understanding this PR correctly).

Speaking of that endpoint, is the endpoint page's description clear enough? The copy "Get Prometheus metrics for the Signer Metrics API" and "Retrieves the Prometheus metrics signer and block proposal related data" isn't very clear to me as to what information this gets me, but maybe it makes sense to devs?

[ryanwaits]

I think we should add a third card to the overview page around the Prometheus metrics endpoint because that is how devs can query behavioral data around individual signers (if I'm understanding hirosystems/signer-metrics-api#61 correctly).

makes sense to me! let me know if this looks good

[max-crawford]

looks great. lgtm.