fix: improve logging for on-demand pages (#11069)

Author: ematipico

.changeset/silly-parents-repair.md

@@ -0,0 +1,5 @@
+---
+"astro": patch
+---
+
+Improves debug logging for on-demand pages

packages/astro/src/core/app/index.ts

@@ -280,6 +280,10 @@ export class App {
 				this.#logRenderOptionsDeprecationWarning();
 			}
 		}
+		if (routeData) {
+			this.#logger.debug("router", "The adapter " + this.#manifest.adapterName + " provided a custom RouteData for ", request.url);
+			this.#logger.debug("router", "RouteData:\n" + routeData);
+		}
 		if (locals) {
 			if (typeof locals !== 'object') {
 				this.#logger.error(null, new AstroError(AstroErrorData.LocalsNotAnObject).stack!);
@@ -296,8 +300,12 @@ export class App {
 		}
 		if (!routeData) {
 			routeData = this.match(request);
+			this.#logger.debug("router", "Astro matched the following route for "+ request.url);
+			this.#logger.debug("router", "RouteData:\n" + routeData);
 		}
 		if (!routeData) {
+			this.#logger.debug("router", "Astro hasn't found routes that match " + request.url);
+			this.#logger.debug("router", "Here's the available routes:\n", this.#manifestData);
 			return this.#renderError(request, { locals, status: 404 });
 		}
 		const pathname = this.#getPathnameFromRequest(request);