added section in the readme

Author: xianshijing-lk

README.md

@@ -324,6 +324,42 @@ and a **ROS2 bridge** that maps `LogLevel` to `RCLCPP_*` macros.
 
 ---
 
+## Tracing
+
+The SDK includes built-in support for [Chromium tracing](https://www.chromium.org/developers/how-tos/trace-event-profiling-tool/), allowing you to capture detailed performance traces for debugging and optimization.
+
+### Basic Usage
+
+```cpp
+#include <livekit/livekit.h>
+
+// Start tracing to a file
+livekit::startTracing("trace.json");
+
+// ... run your application ...
+
+// Stop tracing and flush to file
+livekit::stopTracing();
+```
+
+### Filtering by Category
+
+You can optionally filter which categories to trace:
+
+```cpp
+// Trace only specific categories (supports wildcards)
+livekit::startTracing("trace.json", {"livekit.*", "webrtc.*"});
+```
+
+### Viewing Traces
+
+Open the generated trace file in one of these viewers:
+
+1. **Chrome**: Navigate to `chrome://tracing` and click "Load" to open the trace file
+2. **Perfetto**: Go to https://ui.perfetto.dev and drag-drop your trace file
+
+---
+
 ## 🧪 Integration & Stress Tests
 
 The SDK includes integration and stress tests using Google Test (gtest).

src/tests/common/test_common.h

@@ -25,7 +25,6 @@
 #include <iomanip>
 #include <iostream>
 #include <livekit/livekit.h>
-#include <livekit/tracing.h>
 #include <map>
 #include <memory>
 #include <mutex>

src/tests/stress/test_latency_measurement.cpp

@@ -285,6 +285,7 @@ TEST_F(LatencyMeasurementTest, ConnectionTime) {
 
   RoomOptions options;
   options.auto_subscribe = true;
+  LatencyStats stats;
   int successful_connections = 0;
 
   for (int i = 0; i < config_.test_iterations; ++i) {