Update sdk configuration

Author: tustanivsky

docs/platforms/unreal/migration/index.mdx

@@ -34,7 +34,11 @@ The Unreal SDK no longer modifies call stacks for assertion events by trimming t
 
 - The <PlatformIdentifier name="environment" /> and <PlatformIdentifier name="dist" /> properties must now be set in the plugin settings and can no longer be modified programmatically via scope configuration.
 
-- Sentry can no longer be disabled for specific platforms using the Enable for Build Platform Types option in the plugin settings (`General -> Misc`) or the EnableTargetPlatforms property in the project configuration file.
+- Sentry can no longer be disabled for specific platforms using the `Enable for Build Platform Types` option in the plugin settings (`General -> Misc`) or the EnableTargetPlatforms property in the project configuration file.
+
+- If upgrading from a version prior to 0.9.0 legacy settings `DsnUrl`, `EnableVerboseLogging` and `EnableStackTrace` will no longer be read from the project configuration file automatically. Instead, you must re-set them in plugin settings to adopt the new format.
+
+- On mobile platforms, the default traces sampler will no longer be created automatically. You must now explicitly set the `Traces Sampler` property in the plugin settings to enable performance monitoring (`General -> Performance Monitoring`).
 
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