Add changeset

Author: brophdawg11

.changeset/serious-garlics-push.md

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+---
+"react-router": patch
+---
+
+Add `unstable_instrumentations` API to allow users to add observablity to their apps by instrumenting route loaders, actions, middlewares, lazy, as well as server-side request handlers and client side navigations/fetches
+
+- Framework Mode:
+  - `entry.server.tsx`: `export const unstable_instrumentations = [...]`
+  - `entry.client.tsx`: `<HydratedRouter unstable_instrumentations={[...]} />`
+- Data Mode
+  - `createBrowserRouter(routes, { unstable_instrumentations: [...] })`
+
+This also adds a new `unstable_pattern` parameter to loaders/actions/middleware which contains the un-interpolated route pattern (i.e., `/blog/:slug`) which is useful for aggregating performance metrics by route