[p2p] Add Blocked Peers to Metrics

[patrick-ogrady]

Related: #2570

Change the blocked metric from a simple Gauge (count) to a Family<Peer, Gauge> that reports which specific peers are blocked and when each block expires. This enables debugging by showing exactly who is blocked and for how long.

• When blocked: set gauge to the expiry timestamp (epoch millis)
• When unblocked: remove the metric entry via Family.remove()
• Only currently blocked peers appear in metrics
• Remaining block time can be computed via PromQL: blocked - time() * 1000

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[patrick-ogrady]

Would be cool if we could store with the expiry time?

[danlaine]

Do we want to add a test that checks the expiry time in blocked? e.g. Block a peer, get the expiry time, unblock them, re-block them, get the new expiry time and assert that it's greater than the old one.

[patrick-ogrady]

Do we want to add a test that checks the expiry time in the blocked? e.g. Block a peer, get the expiry time, unblock them, re-block them, get the new expiry time and assert that it's greater than the old one.

IIRC we already have tests that check this but if not, definitely.

[codecov]

Codecov Report

❌ Patch coverage is 90.12346% with 32 lines in your changes missing coverage. Please review.
✅ Project coverage is 92.82%. Comparing base (45b0c9a) to head (f64ce6a).
⚠️ Report is 10 commits behind head on main.

Files with missing lines	Patch %	Lines
...uthenticated/discovery/actors/tracker/directory.rs	90.12%	16 Missing ⚠️
...c/authenticated/lookup/actors/tracker/directory.rs	90.12%	16 Missing ⚠️

@@            Coverage Diff             @@
##             main    #2687      +/-   ##
==========================================
+ Coverage   92.77%   92.82%   +0.05%     
==========================================
  Files         362      361       -1     
  Lines      106074   107035     +961     
==========================================
+ Hits        98412    99359     +947     
- Misses       7662     7676      +14     

Files with missing lines	Coverage Δ
.../authenticated/discovery/actors/tracker/metrics.rs	100.00% <ø> (ø)
...src/authenticated/lookup/actors/tracker/metrics.rs	100.00% <ø> (ø)
...uthenticated/discovery/actors/tracker/directory.rs	92.27% <90.12%> (+0.39%)	⬆️
...c/authenticated/lookup/actors/tracker/directory.rs	92.97% <90.12%> (+0.24%)	⬆️

... and 87 files with indirect coverage changes

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