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# Trace Report UI
This webui implements chrome://traces, which shows trace reports collected by
background tracing. To test, simply navigating to the URL might be sufficient
if traces are present. If no traces, chrome can be started with a trace config
to force trace collection:
1. Create a new config.pbtxt file anywhere on your desktop.
Copy the config below and save the file.
```
scenarios: {
scenario_name: "Test"
trace_config: {
data_sources: {
config: {
name: "org.chromium.trace_event"
track_event_config: {
disabled_categories: ["*"],
enabled_categories: ["toplevel", "__metadata"]
},
}
}
data_sources: { config: { name: "org.chromium.trace_metadata" } }
}
start_rules: {
name: "Timer Start"
delay_ms: 0
}
upload_rules: {
name: "Timer End"
delay_ms: 5000
}
}
```
2. Then compile the proto with:
```
<outdir>/protoc --encode=perfetto.protos.ChromeFieldTracingConfig \
--proto_path=third_party/perfetto third_party/perfetto/protos/perfetto/config/\
chrome/scenario_config.proto < config.pbtxt > config.pb
```
`config.pbtxt` is the absolute path where your file is on your desktop.
Keep the < > around `config.pbtxt` from the command above.
3. And run chrome with command line:
```
--enable-background-tracing=config.pb
```
You should be able to now collect trace reports on your computer and preview
them on chrome://traces.
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