Pratik Mankawde 9a69b91f36 Phase 7: Native OTel metrics migration (Tasks 7.1-7.7) ...

Replace StatsD UDP metric transport with native OpenTelemetry Metrics SDK
export via OTLP/HTTP behind the existing beast::insight::Collector interface.

- Task 7.1: Link opentelemetry-cpp to beast module in CMake when telemetry=ON
- Task 7.2: New OTelCollector class mapping beast::insight instruments to OTel
  SDK (Counter, ObservableGauge, Histogram, Counter<uint64>) with OTLP/HTTP
  export via PeriodicMetricReader at 1s intervals
- Task 7.3: Add server=otel branch to CollectorManager with endpoint config
- Task 7.4: Update otel-collector-config.yaml to use OTLP receiver for metrics
  pipeline (StatsD receiver commented out for backward compat)
- Task 7.5: Metric names preserved via dot-to-underscore formatting matching
  StatsD->Prometheus conventions
- Task 7.6: Rename Grafana dashboards from statsd-* to system-*, update titles
  and UIDs from "StatsD" to "System Metrics"
- Task 7.7: Update integration test to use server=otel, verify OTLP metrics
- Task 7.8: Update runbook, TESTING.md, config reference, and data collection
  reference docs

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

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

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07-observability-backends.md

Phase 1a: OpenTelemetry plan documentation

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08-appendix.md

Appendix: add Phase7_taskList.md to document index

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09-data-collection-reference.md

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

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OpenTelemetryPlan.md

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

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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

Phase 4a: Establish-phase gap fill & cross-node correlation

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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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POC_taskList.md

Phase 1a: OpenTelemetry plan documentation

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presentation.md

Move presentation.md into OpenTelemetryPlan directory

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