*: add p2p send duration metric

[KaloyanTanev]

Add p2p send duration histogram with topic labels. This can help us debug potential contentions.

category: feature
ticket: none

[Copilot]

Pull request overview

Adds a Prometheus histogram to measure wall-clock duration of p2p sends (both Send and SendReceive) and introduces an optional “topic” label to segment timings by sub-protocol/message type.

Changes:

• Add p2p_send_duration_seconds histogram with peer, protocol, and topic labels.
• Add WithSendMetricTopic option and plumb metric-topic support through p2p send options.
• Populate topic labels from key call sites (QBFT, ParSigEx, PeerInfo, Priority).

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
p2p/sender.go	Adds metric-topic option and records send duration for Send/SendReceive.
p2p/metrics.go	Defines new p2p_send_duration_seconds histogram (peer/protocol/topic).
core/priority/prioritiser.go	Tags priority exchange sends with priority_consensus topic.
core/parsigex/parsigex.go	Tags ParSigEx broadcasts with duty-type-derived topic.
core/consensus/qbft/qbft.go	Tags QBFT broadcasts with message-type-derived topic.
app/peerinfo/peerinfo.go	Tags periodic peerinfo requests with peerinfo topic.
app/peerinfo/adhoc.go	Tags ad-hoc peerinfo request with peerinfo_adhoc topic.

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[Copilot]

Pull request overview

Copilot reviewed 8 out of 8 changed files in this pull request and generated 3 comments.

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

❌ Patch coverage is 79.16667% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 57.11%. Comparing base (b35fc00) to head (27e83ad).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
p2p/sender.go	82.35%	3 Missing ⚠️
core/consensus/qbft/qbft.go	50.00%	0 Missing and 1 partial ⚠️
core/parsigex/parsigex.go	50.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4506   +/-   ##
=======================================
  Coverage   57.11%   57.11%           
=======================================
  Files         245      245           
  Lines       32920    32939   +19     
=======================================
+ Hits        18801    18813   +12     
- Misses      11752    11758    +6     
- Partials     2367     2368    +1     

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