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docs: fix disaggregated deployment example in tracing.md (#6999)  
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#!/bin/bash
# SPDX-FileCopyrightText: Copyright (c) 2025-2026 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
# SPDX-License-Identifier: Apache-2.0
set -e
trap 'echo Cleaning up...; kill 0' EXIT

# Common configuration
MODEL="Qwen/Qwen3-0.6B"

# Parse command line arguments
while [[ $# -gt 0 ]]; do
    case $1 in
        --model)
            MODEL="$2"
            shift 2
            ;;
        *)
            shift
            ;;
    esac
done

# Enable tracing -- requires the observability stack (Prometheus, Grafana, Tempo).
# See docs/observability/README.md for setup instructions.
export DYN_LOGGING_JSONL=true
export OTEL_EXPORT_ENABLED=true
export OTEL_EXPORTER_OTLP_TRACES_ENDPOINT="${OTEL_EXPORTER_OTLP_TRACES_ENDPOINT:-http://localhost:4317}"

HTTP_PORT="${DYN_HTTP_PORT:-8000}"
echo "=========================================="
echo "Launching Disaggregated Serving + Tracing (2 GPUs)"
echo "=========================================="
echo "Model:       $MODEL"
echo "Frontend:    http://localhost:$HTTP_PORT"
echo "Tempo:       $OTEL_EXPORTER_OTLP_TRACES_ENDPOINT"
echo "=========================================="
echo ""
echo "Example test command:"
echo ""
echo "  curl http://localhost:${HTTP_PORT}/v1/chat/completions \\"
echo "    -H 'Content-Type: application/json' \\"
echo "    -H 'x-request-id: test-trace-001' \\"
echo "    -d '{"
echo "      \"model\": \"${MODEL}\","
echo "      \"messages\": [{\"role\": \"user\", \"content\": \"Explain why Roger Federer is considered one of the greatest tennis players of all time\"}],"
echo "      \"max_tokens\": 32"
echo "    }'"
echo ""
echo "=========================================="

# run ingress
# dynamo.frontend accepts either --http-port flag or DYN_HTTP_PORT env var (defaults to 8000)
export OTEL_SERVICE_NAME=dynamo-frontend
python -m dynamo.frontend &

# --enforce-eager is added for quick deployment. for production use, need to remove this flag
export OTEL_SERVICE_NAME=dynamo-worker-decode
DYN_SYSTEM_PORT=${DYN_SYSTEM_PORT1:-8081} \
CUDA_VISIBLE_DEVICES=0 python3 -m dynamo.vllm \
    --model "$MODEL" \
    --enforce-eager \
    --otlp-traces-endpoint="$OTEL_EXPORTER_OTLP_TRACES_ENDPOINT" \
    --disaggregation-mode decode \
    --kv-transfer-config '{"kv_connector":"NixlConnector","kv_role":"kv_both"}' &

export OTEL_SERVICE_NAME=dynamo-worker-prefill
DYN_SYSTEM_PORT=${DYN_SYSTEM_PORT2:-8082} \
VLLM_NIXL_SIDE_CHANNEL_PORT=20097 \
CUDA_VISIBLE_DEVICES=1 python3 -m dynamo.vllm \
    --model "$MODEL" \
    --enforce-eager \
    --otlp-traces-endpoint="$OTEL_EXPORTER_OTLP_TRACES_ENDPOINT" \
    --disaggregation-mode prefill \
    --kv-transfer-config '{"kv_connector":"NixlConnector","kv_role":"kv_both"}' \
    --kv-events-config '{"publisher":"zmq","topic":"kv-events","endpoint":"tcp://*:20081","enable_kv_cache_events":true}'