/**
 * Sentry support;
 * - Starts a new root span for each incoming request.
 * - Tries to name it based on the finalized name of `ctx.event`.
 *     This is most likely in the format `router.foo.bar` for matched routes by the
 * generated router.
 * - Uses the sentry-trace header when provided.
 *     Note that if a custom list of `allowHeaders` is provided in the CORS options,
 * 'sentry-trace' and 'baggage' should be allowed as well.
 * - If the error handler retrieves an unknown or AppError.serverError, it is reported as
 * an uncaught exception.
 *
 * @returns {import("koa").Middleware}
 */
export function sentry(): import("koa").Middleware;