chore: add more logs and metrics

[alok-ssv]

Summary

Expand observability for pubsub validation, highlighted-peer tracing, connection handshakes, and stream operations so failures and latency can be attributed to the right stage, topic, and peer.

What Changed

• Added validation-stage tagging to SSV validation errors so failures can be traced to the exact phase that failed.
• Extended SSV validation observer events with:
  • validation stage
  • pubsub topic
  • payload size
• Added pubsub validation metrics for:
  • messages received
  • messages validated by result
  • validation duration
  • handler errors after validation succeeds
• Added highlighted-peer pubsub observability for:
  • reject events
  • drop events
• Updated the pubsub tracer so batched DROP_RPC events emit one drop datapoint per real topic instead of collapsing into a synthetic multiple bucket.
• Added p2p connection handshake observability with:
  • handshake outcome
  • handshake reason
  • handshake duration
• Added stream error metrics with operation and reason labels.
• Extended tests across validation, connections, streams, topics, and highlighted-peer tracing to cover the new metrics and event fields.

Why

The previous observability was too coarse to explain where failures happened or which traffic was affected. This change makes dashboards, alerts, and incident triage more accurate by distinguishing:

• validation stage failures versus successful validation followed by handler failure
• topic-specific pubsub behavior
• real connection handshake outcomes versus ignored or duplicate connection paths
• actual drop events versus normal RPC delivery paths
• per-topic behavior for batched pubsub drops

Validation

• go test ./network/topics -run TestPsTracerLogDropRPCRecordsEachTopic -count=1
• go test ./network/topics

[codecov]

Codecov Report

❌ Patch coverage is 62.85714% with 65 lines in your changes missing coverage. Please review.
✅ Project coverage is 60.1%. Comparing base (18f6006) to head (11b9f12).
⚠️ Report is 20 commits behind head on attack-sim-observability-clean.

Files with missing lines	Patch %	Lines
network/topics/tracer.go	18.1%	16 Missing and 2 partials ⚠️
message/validation/errors.go	52.1%	9 Missing and 2 partials ⚠️
network/peers/connections/conn_handler.go	80.0%	7 Missing ⚠️
network/streams/controller.go	56.2%	7 Missing ⚠️
network/topics/controller.go	44.4%	5 Missing ⚠️
message/validation/partial_validation.go	42.8%	4 Missing ⚠️
message/validation/validation.go	71.4%	4 Missing ⚠️
network/peers/peertrace/observer.go	84.0%	2 Missing and 2 partials ⚠️
message/validation/consensus_validation.go	66.6%	3 Missing ⚠️
message/validation/stage.go	86.6%	1 Missing and 1 partial ⚠️

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[github-actions]

This pull request has been marked as stale due to 60 days of inactivity. It will be closed in 30 days if there are no updates. Please comment if you would like to keep it open.