I had a terrible time trying to find react performance _monitoring_. There's plenty of performance _troubleshooting_ once you already know what component is slo

I had a terrible time trying to find react performance _monitoring_. There's plenty of performance _troubleshooting_ once you already know what component is slow, but nothing that monitors. Did I miss something? I see some `measureLifecycleperf` functions in the react source but those look like dead ends.