Phase 6: Integrate beast::insight StatsD metrics into telemetry pipeline

[pratikmankawde]

PR Chain: #6436 → #6437 → #6438 → #6424 → #6425 → #6426 → #6427 → #6433 / #6439 (this PR)
Base: pratik/otel-phase5-docs-deployment

Summary

• Adds StatsD receiver to the OTel Collector, bridging rippled's 300+ existing beast::insight metrics into Prometheus alongside span-derived RED metrics
• Creates 3 new Grafana dashboards (24 panels): Node Health, Network Traffic, RPC & Pathfinding (StatsD)
• Adds 6 new spans (ledger.build, ledger.validate, ledger.store, tx.apply, peer.proposal.receive, peer.validation.receive) and expands existing dashboards to 32 panels
• Extends integration test to verify StatsD metrics flow through the pipeline

Chained on: #6427 (Phase 5)

Details

StatsD Pipeline Integration

• OTel Collector statsd receiver on UDP 8125 with timer_histogram_mapping for histogram conversion
• [insight] config added to integration test node configs (server=statsd, address=127.0.0.1:8125, prefix=rippled)
• Metrics pipeline: receivers: [spanmetrics, statsd] → single Prometheus endpoint on port 8889

New Grafana Dashboards (StatsD)

• Node Health: Validated/Published Ledger Age, Operating Mode, I/O Latency, Job Queue, Ledger Fetch/History
• Network Traffic: Active Peers, Disconnects, Bytes/Messages In/Out, TX/Proposal/Validation Traffic
• RPC & Pathfinding: RPC Rate/Latency/Size, Pathfinding Fast/Full Duration, Resource Warnings/Drops

New Spans (6)

• ledger.build, ledger.validate, ledger.store (fills empty trace_ledger category)
• tx.apply (transaction batch application per ledger)
• peer.proposal.receive, peer.validation.receive (extends peer tracing, disabled by default)

Known Limitation

Resource Manager warn and drop metrics use non-standard |m StatsD type which the OTel receiver silently drops. Fix (|m → |c in StatsDCollector.cpp:706) is deferred as a separate breaking change (Phase 6 Task 6.1).

Test plan

• pcc passes on all changed C++ files
• All dashboard JSON files parse cleanly (python3 -m json.tool)
• docker compose up starts StatsD receiver on port 8125
• StatsD metrics visible in Prometheus after configuring [insight] in rippled
• New spans appear in Jaeger: ledger.build, ledger.validate, ledger.store, tx.apply
• Integration test passes StatsD metric verification step

🤖 Generated with Claude Code

[codecov]

Codecov Report

❌ Patch coverage is 43.75000% with 9 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (pratik/otel-phase5-docs-deployment@85f583f). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
src/xrpld/overlay/detail/PeerImp.cpp	0.0%	6 Missing ⚠️
src/xrpld/app/ledger/detail/LedgerMaster.cpp	40.0%	3 Missing ⚠️

Additional details and impacted files

@@                         Coverage Diff                          @@
##             pratik/otel-phase5-docs-deployment   #6439   +/-   ##
====================================================================
  Coverage                                      ?   79.7%           
====================================================================
  Files                                         ?     851           
  Lines                                         ?   67968           
  Branches                                      ?    7602           
====================================================================
  Hits                                          ?   54187           
  Misses                                        ?   13781           
  Partials                                      ?       0           

Files with missing lines	Coverage Δ
src/xrpld/app/ledger/detail/BuildLedger.cpp	92.9% <100.0%> (ø)
src/xrpld/app/ledger/detail/LedgerMaster.cpp	42.7% <40.0%> (ø)
src/xrpld/overlay/detail/PeerImp.cpp	5.8% <0.0%> (ø)

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.