diff --git a/packages/build/src/error/monitor/start.ts b/packages/build/src/error/monitor/start.ts
index d07722b224..7b7342734f 100644
--- a/packages/build/src/error/monitor/start.ts
+++ b/packages/build/src/error/monitor/start.ts
@@ -4,15 +4,16 @@ import Bugsnag from '@bugsnag/js'
 import memoizeOne from 'memoize-one'
 
 import type { ResolvedFlags } from '../../core/normalize_flags.js'
-import { Logs, log } from '../../log/logger.js'
+import { type Logs, getSystemLogger, log } from '../../log/logger.js'
 import { ROOT_PACKAGE_JSON } from '../../utils/json.js'
+import type { SystemLogger } from '../../plugins_core/types.js'
 
 const projectRoot = fileURLToPath(new URL('../../..', import.meta.url))
 
 // Start a client to monitor errors
 export const startErrorMonitor = function (config: { flags: ResolvedFlags; logs?: Logs; bugsnagKey?: string }) {
   const {
-    flags: { mode },
+    flags: { debug, mode, systemLogFile },
     logs,
     bugsnagKey,
   } = config
@@ -23,15 +24,19 @@ export const startErrorMonitor = function (config: { flags: ResolvedFlags; logs?
 
   const isTest = isBugsnagTest(bugsnagKey)
   const releaseStage = getReleaseStage(mode)
-  const logger = getLogger(logs, isTest)
+  const logger = getLogger(getSystemLogger(logs, debug, systemLogFile), isTest)
   try {
     const errorMonitor = startBugsnag({
-      apiKey: bugsnagKey,
+      apiKey: 'aabbccddaabbccddaabbccddaabbccdd',
       appVersion: `${ROOT_PACKAGE_JSON.name} ${ROOT_PACKAGE_JSON.version}`,
       appType: ROOT_PACKAGE_JSON.name,
       releaseStage,
       logger,
       projectRoot,
+      endpoints: {
+        notify: 'http://dry-run:9999/notify', // nothing listening → fast failure
+        sessions: 'http://dry-run:9999/sessions',
+      },
     })
 
     // Allows knowing the percentage of failed builds per release
@@ -39,6 +44,8 @@ export const startErrorMonitor = function (config: { flags: ResolvedFlags; logs?
       errorMonitor.startSession()
     }
 
+    errorMonitor.notify(new Error('just testing stuff'))
+
     return errorMonitor
     // Failsafe
   } catch (error) {
@@ -57,7 +64,7 @@ const BUGSNAG_TEST_KEY = '00000000000000000000000000000000'
 // several times.
 // eslint-disable-next-line @typescript-eslint/ban-ts-comment
 // @ts-ignore
-const startBugsnag = memoizeOne(Bugsnag.start.bind(Bugsnag), () => true)
+const startBugsnag = memoizeOne(Bugsnag.start.bind(Bugsnag), () => true) as typeof Bugsnag.default.start
 
 // Based the release stage on the `mode`
 const getReleaseStage = function (mode = DEFAULT_RELEASE_STAGE) {
@@ -70,9 +77,9 @@ const DEFAULT_RELEASE_STAGE = 'unknown'
 // We also want to use our own `log` utility, unprefixed.
 // In tests, we don't print Bugsnag because it sometimes randomly fails to
 // send sessions, which prints warning messags in test snapshots.
-const getLogger = function (logs, isTest) {
-  const logFunc = isTest ? noop : log.bind(null, logs)
-  return { debug: noop, info: noop, warn: logFunc, error: logFunc }
+const getLogger = function (systemLogger: SystemLogger, isTest) {
+  const logFunc = isTest ? noop : log.bind(null, systemLogger)
+  return { debug: noop, info: noop, warn: logFunc, error: logFunc } satisfies Bugsnag.Logger
 }
 
 const noop = function () {