diff --git a/packages/host/app/lib/current-run.ts b/packages/host/app/lib/current-run.ts
index 5aa9d34745..5d2730401a 100644
--- a/packages/host/app/lib/current-run.ts
+++ b/packages/host/app/lib/current-run.ts
@@ -36,6 +36,7 @@ import {
   type SerializedError,
 } from '@cardstack/runtime-common/error';
 import { RealmPaths, LocalPath } from '@cardstack/runtime-common/paths';
+import { reportError } from '@cardstack/runtime-common/realm';
 import {
   isIgnored,
   type Reader,
@@ -475,9 +476,9 @@ export class CurrentRun {
         deferred.reject(err);
         throw err;
       }
-      log.warn(
-        `encountered error indexing card instance ${path}: ${error.error.detail}`,
-      );
+      let warning = `encountered error indexing card instance ${path}: ${error.error.detail}`;
+      log.warn(warning);
+      reportError(new Error(warning));
       this.setInstance(instanceURL, error);
       deferred.fulfill();
     }
diff --git a/packages/realm-server/fastboot.ts b/packages/realm-server/fastboot.ts
index f223d43657..3cb0f17dee 100644
--- a/packages/realm-server/fastboot.ts
+++ b/packages/realm-server/fastboot.ts
@@ -7,6 +7,7 @@ import {
   type RunnerOpts,
 } from '@cardstack/runtime-common/search-index';
 import { JSDOM } from 'jsdom';
+import { type ErrorReporter } from '@cardstack/runtime-common/realm';
 
 const appName = '@cardstack/host';
 export async function makeFastBootIndexRunner(
@@ -15,6 +16,11 @@ export async function makeFastBootIndexRunner(
 ): Promise<{ getRunner: IndexRunner; distPath: string }> {
   let fastboot: FastBootInstance;
   let distPath: string;
+
+  let globalWithErrorReporter = global as typeof globalThis & {
+    __boxelErrorReporter: ErrorReporter;
+  };
+
   if (typeof dist === 'string') {
     distPath = dist;
     fastboot = new FastBoot({
@@ -22,6 +28,7 @@ export async function makeFastBootIndexRunner(
       resilient: false,
       buildSandboxGlobals(defaultGlobals: any) {
         return Object.assign({}, defaultGlobals, {
+          __boxelErrorReporter: globalWithErrorReporter.__boxelErrorReporter,
           URL: globalThis.URL,
           Request: globalThis.Request,
           Response: globalThis.Response,
@@ -38,6 +45,7 @@ export async function makeFastBootIndexRunner(
       dist,
       (defaultGlobals: any) => {
         return Object.assign({}, defaultGlobals, {
+          __boxelErrorReporter: globalWithErrorReporter.__boxelErrorReporter,
           URL: globalThis.URL,
           Request: globalThis.Request,
           Response: globalThis.Response,
diff --git a/packages/realm-server/main.ts b/packages/realm-server/main.ts
index bc15cfd0af..7e22e81d23 100644
--- a/packages/realm-server/main.ts
+++ b/packages/realm-server/main.ts
@@ -9,9 +9,27 @@ import { RunnerOptionsManager } from '@cardstack/runtime-common/search-index';
 import { readFileSync } from 'fs-extra';
 import { shimExternals } from './lib/externals';
 import { type RealmPermissions as RealmPermissionsInterface } from '@cardstack/runtime-common/realm';
+import * as Sentry from '@sentry/node';
+import { setErrorReporter } from '@cardstack/runtime-common/realm';
 
 import fs from 'fs';
 
+let log = logger('main');
+
+if (process.env.REALM_SENTRY_DSN) {
+  log.info('Setting up Sentry.');
+  Sentry.init({
+    dsn: process.env.REALM_SENTRY_DSN,
+    environment: process.env.REALM_SENTRY_ENVIRONMENT || 'development',
+  });
+
+  setErrorReporter(Sentry.captureException);
+} else {
+  log.warn(
+    `No REALM_SENTRY_DSN environment variable found, skipping Sentry setup.`,
+  );
+}
+
 const REALM_SECRET_SEED = process.env.REALM_SECRET_SEED;
 if (!REALM_SECRET_SEED) {
   console.error(
@@ -111,7 +129,6 @@ if (
   process.exit(-1);
 }
 
-let log = logger('main');
 let virtualNetwork = new VirtualNetwork();
 let loader = virtualNetwork.createLoader();
 shimExternals(virtualNetwork);
diff --git a/packages/realm-server/package.json b/packages/realm-server/package.json
index 25e8815900..fcefe62fda 100644
--- a/packages/realm-server/package.json
+++ b/packages/realm-server/package.json
@@ -7,6 +7,7 @@
     "@cardstack/runtime-common": "workspace:*",
     "@koa/cors": "^4.0.0",
     "@koa/router": "^12.0.0",
+    "@sentry/node": "^7.105.0",
     "@types/basic-auth": "^1.1.3",
     "@types/eventsource": "^1.1.11",
     "@types/flat": "^5.0.5",
diff --git a/packages/realm-server/server.ts b/packages/realm-server/server.ts
index dae271574d..76b1ba5e25 100644
--- a/packages/realm-server/server.ts
+++ b/packages/realm-server/server.ts
@@ -27,6 +27,7 @@ import './lib/externals';
 import { nodeStreamToText } from './stream';
 import mime from 'mime-types';
 import { extractSupportedMimeType } from '@cardstack/runtime-common/router';
+import * as Sentry from '@sentry/node';
 
 interface Options {
   assetsURL?: URL;
@@ -96,6 +97,13 @@ export class RealmServer {
       .use(router.routes())
       .use(this.serveFromRealm);
 
+    app.on('error', (err, ctx) => {
+      Sentry.withScope((scope) => {
+        scope.setSDKProcessingMetadata({ request: ctx.request });
+        Sentry.captureException(err);
+      });
+    });
+
     return app;
   }
 
@@ -119,6 +127,10 @@ export class RealmServer {
   }
 
   private serveFromRealm = async (ctxt: Koa.Context, _next: Koa.Next) => {
+    if (ctxt.request.path === '/_boom') {
+      throw new Error('boom');
+    }
+
     let realm = this.realms.find((r) => {
       let reversedResolution = r.loader.reverseResolution(
         fullRequestURL(ctxt).href,
diff --git a/packages/runtime-common/realm.ts b/packages/runtime-common/realm.ts
index f1970cee35..d85f3f33d4 100644
--- a/packages/runtime-common/realm.ts
+++ b/packages/runtime-common/realm.ts
@@ -1676,6 +1676,22 @@ function lastModifiedHeader(
   ) as {} | { 'last-modified': string };
 }
 
+export type ErrorReporter = (error: Error) => void;
+
+let globalWithErrorReporter = global as typeof globalThis & {
+  __boxelErrorReporter: ErrorReporter;
+};
+
+export function setErrorReporter(reporter: ErrorReporter) {
+  globalWithErrorReporter.__boxelErrorReporter = reporter;
+}
+
+export function reportError(error: Error) {
+  if (globalWithErrorReporter.__boxelErrorReporter) {
+    globalWithErrorReporter.__boxelErrorReporter(error);
+  }
+}
+
 export interface CardDefinitionResource {
   id: string;
   type: 'card-definition';
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index c2f8030850..44f5cb46c0 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -1407,6 +1407,9 @@ importers:
       '@koa/router':
         specifier: ^12.0.0
         version: 12.0.0
+      '@sentry/node':
+        specifier: ^7.105.0
+        version: 7.105.0
       '@types/basic-auth':
         specifier: ^1.1.3
         version: 1.1.3
@@ -4920,7 +4923,6 @@ packages:
       '@sentry/core': 7.105.0
       '@sentry/types': 7.105.0
       '@sentry/utils': 7.105.0
-    dev: false
 
   /@sentry/core@7.105.0:
     resolution: {integrity: sha512-5xsaTG6jZincTeJUmZomlv20mVRZUEF1U/g89lmrSOybyk2+opEnB1JeBn4ODwnvmSik8r2QLr6/RiYlaxRJCg==}
@@ -4928,7 +4930,6 @@ packages:
     dependencies:
       '@sentry/types': 7.105.0
       '@sentry/utils': 7.105.0
-    dev: false
 
   /@sentry/node@7.105.0:
     resolution: {integrity: sha512-b0QwZ7vT4hcJi6LmNRh3dcaYpLtXnkYXkL0rfhMb8hN8sUx8zuOWFMI7j0cfAloVThUeJVwGyv9dERfzGS2r2w==}
@@ -4938,19 +4939,16 @@ packages:
       '@sentry/core': 7.105.0
       '@sentry/types': 7.105.0
       '@sentry/utils': 7.105.0
-    dev: false
 
   /@sentry/types@7.105.0:
     resolution: {integrity: sha512-80o0KMVM+X2Ym9hoQxvJetkJJwkpCg7o6tHHFXI+Rp7fawc2iCMTa0IRQMUiSkFvntQLYIdDoNNuKdzz2PbQGA==}
     engines: {node: '>=8'}
-    dev: false
 
   /@sentry/utils@7.105.0:
     resolution: {integrity: sha512-YVAV0c2KLM8+VZCicQ/E/P2+J9Vs0hGhrXwV7w6ZEAtvxrg4oF270toL1WRhvcaf8JO4J1v4V+LuU6Txs4uEeQ==}
     engines: {node: '>=8'}
     dependencies:
       '@sentry/types': 7.105.0
-    dev: false
 
   /@sideway/address@4.1.4:
     resolution: {integrity: sha512-7vwq+rOHVWjyXxVlR76Agnvhy8I9rpzjosTESvmhNeXOXdZZB15Fl+TI9x1SiHZH5Jv2wTGduSxFDIaq0m3DUw==}