Initial implementation of opentelemetry-llm tool

.env.example

@@ -1,9 +1,52 @@
-# Enable debug logging
+# PostHog Configuration (existing)
+POSTHOG_API_KEY=your_posthog_api_key_here
+POSTHOG_HOST=https://app.posthog.com
+
+# OpenTelemetry Configuration
+# ==========================
+
+# Service Configuration
+OTEL_SERVICE_NAME=llm-observability-mcp
+OTEL_SERVICE_VERSION=1.0.0
+OTEL_ENVIRONMENT=development
+
+# OTLP Endpoints
+# Uncomment and configure based on your backend
+
+# Jaeger (local development)
+# OTEL_EXPORTER_OTLP_ENDPOINT=http://localhost:4318
+
+# New Relic
+# OTEL_EXPORTER_OTLP_ENDPOINT=https://otlp.nr-data.net:4318
+# OTEL_EXPORTER_OTLP_HEADERS=api-key=YOUR_NEW_RELIC_LICENSE_KEY
+
+# Grafana Cloud
+# OTEL_EXPORTER_OTLP_ENDPOINT=https://otlp-gateway-prod-us-central-0.grafana.net/otlp
+# OTEL_EXPORTER_OTLP_HEADERS=Authorization=Basic YOUR_BASE64_ENCODED_CREDENTIALS
+
+# Datadog
+# OTEL_EXPORTER_OTLP_ENDPOINT=https://api.datadoghq.com/api/v2/series
+# OTEL_EXPORTER_OTLP_HEADERS=DD-API-KEY=YOUR_DD_API_KEY
+
+# Honeycomb
+# OTEL_EXPORTER_OTLP_ENDPOINT=https://api.honeycomb.io/v1/traces
+# OTEL_EXPORTER_OTLP_HEADERS=x-honeycomb-team=YOUR_API_KEY
+
+# Lightstep
+# OTEL_EXPORTER_OTLP_ENDPOINT=https://ingest.lightstep.com:443/api/v2/otel/trace
+# OTEL_EXPORTER_OTLP_HEADERS=lightstep-access-token=YOUR_ACCESS_TOKEN
+
+# Separate endpoints (optional)
+# OTEL_EXPORTER_OTLP_METRICS_ENDPOINT=http://localhost:4318/v1/metrics
+# OTEL_EXPORTER_OTLP_TRACES_ENDPOINT=http://localhost:4318/v1/traces
+# OTEL_EXPORTER_OTLP_LOGS_ENDPOINT=http://localhost:4318/v1/logs
+
+# Export Configuration
+OTEL_METRIC_EXPORT_INTERVAL=10000
+OTEL_METRIC_EXPORT_TIMEOUT=5000
+
+# Sampling Configuration
+OTEL_TRACES_SAMPLER_ARG=1.0
+
+# Debug Mode
 DEBUG=false
-
-# Transport mode
-TRANSPORT_MODE=<http | stdio>
-
-# PostHog LLM Observability configuration
-POSTHOG_API_KEY=<YourPostHogAPIKeyGoesHere>
-POSTHOG_HOST=https://us.i.posthog.com