JSON-serialized report body.
Configured destination identifier or URL.
Final headers after applying monitor defaults and user overrides.
True for the final report sent while the page is being hidden or unloaded. Such a request
must outlive the page, for example through fetch with keepalive or navigator.sendBeacon.
Transformed report value before JSON serialization.
OptionalsignalAborted on timeout, stop, or destroy. Custom transports should honor cancellation.
Serialized report handed to a custom production transport.