Pratik Mankawde 919908b2b4 Phase 9: Internal Metric Instrumentation Gap Fill (Tasks 9.1-9.10) ...

Implement ~50 OTel metrics covering NodeStore I/O, cache hit rates,
TxQ state, PerfLog per-RPC/per-job counters, CountedObject instances,
and load factor breakdown via MetricsRegistry.

Core implementation:
- MetricsRegistry class with synchronous instruments (Counter, Histogram)
  for RPC and Job metrics, and ObservableGauge callbacks for cache, TxQ,
  CountedObject, LoadFactor, and NodeStore state polling.
- ServiceRegistry extended with getMetricsRegistry() virtual method.
- Application wires MetricsRegistry lifecycle (create/start/stop).
- PerfLogImp instrumented to emit OTel metrics on RPC and Job events.

Dashboards & observability:
- 3 new Grafana dashboards: RPC Performance, Job Queue, Fee Market/TxQ.
- Extended statsd-node-health dashboard with NodeStore, Cache, and
  CountedObject panels.
- 10 alerting rules added to telemetry-runbook.md.
- Integration test extended with 12 OTel metric validation checks.

Documentation:
- 09-data-collection-reference.md updated with Phase 9 metric tables.
- Unit tests for MetricsRegistry disabled-path (no-op) behavior.

All OTel SDK code guarded with #ifdef XRPL_ENABLE_TELEMETRY.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

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..

00-tracing-fundamentals.md

Phase 1a: OpenTelemetry plan documentation

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01-architecture-analysis.md

Phase 1a: OpenTelemetry plan documentation

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02-design-decisions.md

Phase 7-8: Plan docs for native OTel metrics migration and log-trace correlation

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03-implementation-strategy.md

Phase 1a: OpenTelemetry plan documentation

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04-code-samples.md

Phase 1a: OpenTelemetry plan documentation

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05-configuration-reference.md

Phase 7: Native OTel metrics migration (Tasks 7.1-7.7)

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06-implementation-phases.md

Phase 9-11: Future enhancement plans for metric gap fill, workload validation, and third-party pipelines

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07-observability-backends.md

Phase 1a: OpenTelemetry plan documentation

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08-appendix.md

Phase 9-11: Future enhancement plans for metric gap fill, workload validation, and third-party pipelines

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09-data-collection-reference.md

Phase 9: Internal Metric Instrumentation Gap Fill (Tasks 9.1-9.10)

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OpenTelemetryPlan.md

Fix prettier markdown table alignment

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Phase2_taskList.md

Phase 5: Observability stack — spanmetrics, dashboards, runbook

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Phase3_taskList.md

Phase 5: Observability stack — spanmetrics, dashboards, runbook

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Phase4_taskList.md

Add consensus.accept.apply span with ledger close time attributes

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Phase5_IntegrationTest_taskList.md

Phase 5: Observability stack — spanmetrics, dashboards, runbook

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Phase5_taskList.md

Phase 2: Complete RPC tracing — interface, macros, attributes, tests

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Phase7_taskList.md

Separate plan from tasks: move Phase 7 plan into 06-implementation-phases.md, remove Phase 8 content

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Phase8_taskList.md

Phase 8: Log-trace correlation plan docs and task list

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Phase9_taskList.md

Phase 9-11: Future enhancement plans for metric gap fill, workload validation, and third-party pipelines

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Phase10_taskList.md

Phase 9-11: Future enhancement plans for metric gap fill, workload validation, and third-party pipelines

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Phase11_taskList.md

Phase 9-11: Future enhancement plans for metric gap fill, workload validation, and third-party pipelines

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POC_taskList.md

Phase 1a: OpenTelemetry plan documentation

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presentation.md

Move presentation.md into OpenTelemetryPlan directory

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