chore: import upstream snapshot with attribution

python/samples/02-agents/observability/.env.example

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+# Observability Configuration
+# ===========================
+
+# Standard OpenTelemetry environment variables
+# See https://opentelemetry.io/docs/specs/otel/configuration/sdk-environment-variables/
+
+# OTLP Endpoint (for Aspire Dashboard, Jaeger, etc.)
+# Default protocol is gRPC (port 4317), HTTP uses port 4318
+OTEL_EXPORTER_OTLP_ENDPOINT="http://localhost:4317"
+
+# Optional: Override endpoint for specific signals
+# OTEL_EXPORTER_OTLP_TRACES_ENDPOINT="http://localhost:4317"
+# OTEL_EXPORTER_OTLP_METRICS_ENDPOINT="http://localhost:4317"
+# OTEL_EXPORTER_OTLP_LOGS_ENDPOINT="http://localhost:4317"
+
+# Optional: Specify protocol (grpc or http)
+# OTEL_EXPORTER_OTLP_PROTOCOL="grpc"
+
+# Optional: Add headers (e.g., for authentication)
+# OTEL_EXPORTER_OTLP_HEADERS="Authorization=Bearer token,x-api-key=key"
+
+# Optional: Service identification
+# OTEL_SERVICE_NAME="my-agent-app"
+# OTEL_SERVICE_VERSION="1.0.0"
+# OTEL_RESOURCE_ATTRIBUTES="deployment.environment=dev,host.name=localhost"
+
+# Agent Framework specific settings
+# ==================================
+
+# Observability is enabled by default. Set to "false" to opt out.
+# ENABLE_INSTRUMENTATION=false
+
+# Enable sensitive data logging (prompts, responses, etc.)
+# WARNING: Only enable in dev/test environments
+ENABLE_SENSITIVE_DATA=true
+
+# Optional: Enable console exporters for debugging
+# ENABLE_CONSOLE_EXPORTERS=true
+
+# OpenAI specific variables
+# ==========================
+OPENAI_API_KEY="..."
+OPENAI_CHAT_MODEL="gpt-4o-2024-08-06"
+OPENAI_CHAT_COMPLETION_MODEL="gpt-4o-2024-08-06"
+
+# Azure AI Foundry specific variables
+# ====================================
+FOUNDRY_PROJECT_ENDPOINT="..."
+FOUNDRY_MODEL="gpt-4o-mini"