chore: import upstream snapshot with attribution

apps/webapp/app/routes/metrics.ts

@@ -0,0 +1,28 @@
+import type { LoaderFunctionArgs } from "@remix-run/server-runtime";
+import { prisma } from "~/db.server";
+import { metricsRegister } from "~/metrics.server";
+
+export async function loader({ request }: LoaderFunctionArgs) {
+  // If the TRIGGER_METRICS_AUTH_PASSWORD is set, we need to check if the request has the correct password in auth header
+  const authPassword = process.env.TRIGGER_METRICS_AUTH_PASSWORD;
+
+  if (authPassword) {
+    const auth = request.headers.get("Authorization");
+    if (auth !== `Bearer ${authPassword}`) {
+      return new Response("Unauthorized", { status: 401 });
+    }
+  }
+
+  // We need to remove empty lines from the prisma metrics, grafana doesn't like them
+  const prismaMetrics = (await prisma.$metrics.prometheus()).replace(/^\s*[\r\n]/gm, "");
+  const coreMetrics = await metricsRegister.metrics();
+
+  // Order matters, core metrics end with `# EOF`, prisma metrics don't
+  const metrics = prismaMetrics + coreMetrics;
+
+  return new Response(metrics, {
+    headers: {
+      "Content-Type": metricsRegister.contentType,
+    },
+  });
+}