add trace propagation targets

Author: chargome

platform-includes/performance/configure-sample-rate/javascript.react-router.mdx

@@ -14,6 +14,9 @@ Sentry.init({
   // We recommend adjusting this value in production, or using tracesSampler
   // for finer control
   tracesSampleRate: 1.0,
+  
+  // Set `tracePropagationTargets` to control for which URLs trace propagation should be enabled
+  tracePropagationTargets: ["localhost", /^https:\/\/yourserver\.io\/api/],
 
   // ... rest of your config
 });