Summary

Create a development guide for the 7 exporter types and 3 transport layers, documenting how to create custom exporters, configure transports, and handle data format transformation.

Parent Issue

Part of: [EPIC] docs: Address documentation gaps across all ecosystem systems (kcenon/common_system#325)

Background (Why)

monitoring_system supports 7 exporter types across metric and trace exporters, with 3 transport layers. While the API reference documents individual classes, there is no guide explaining how the exporter pipeline works end-to-end, how to create custom exporters, or how to configure transport layers.

Source files:

• include/kcenon/monitoring/exporters/metric_exporters.h — Prometheus, StatsD, InfluxDB, Graphite
• include/kcenon/monitoring/exporters/trace_exporters.h — Jaeger, Zipkin, OTLP, Console
• include/kcenon/monitoring/exporters/opentelemetry_adapter.h — OpenTelemetry adapter
• include/kcenon/monitoring/exporters/otlp_grpc_exporter.h — OTLP via gRPC
• include/kcenon/monitoring/exporters/http_transport.h — HTTP transport layer
• include/kcenon/monitoring/exporters/grpc_transport.h — gRPC transport layer
• include/kcenon/monitoring/exporters/udp_transport.h — UDP transport layer

Scope (What)

Create docs/guides/EXPORTER_DEVELOPMENT.md covering:

1. Exporter Architecture

• Export pipeline: metrics → serialization → transport → destination
• Metric exporters vs trace exporters
• Transport layer abstraction
• OpenTelemetry integration path

2. Built-in Exporters

3. Transport Layer

• http_transport.h — Configuration, TLS, authentication
• grpc_transport.h — Channel configuration, streaming
• udp_transport.h — Datagram configuration, batching

4. Creating Custom Exporters

• Exporter interface implementation
• Data format transformation
• Error handling and retries
• Backpressure handling
• Buffering strategies

5. OpenTelemetry Integration

• opentelemetry_adapter.h — Bridging to OTEL SDK
• otlp_grpc_exporter.h — Direct OTLP export
• Collector sidecar pattern (see OTEL_COLLECTOR_SIDECAR.md)

6. Configuration Examples

• Prometheus endpoint setup
• OTLP gRPC export to collector
• Multi-exporter fan-out

Acceptance Criteria

• Exporter pipeline architecture documented
• All 8 built-in exporters documented with configuration
• All 3 transport layers documented
• Custom exporter implementation guide
• OpenTelemetry integration patterns
• At least 3 configuration examples