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Why a thrown exception is not always an incident
Exceptions can represent normal application decisions, such as a missing resource or invalid input, as well as unexpected failures that need investigation. Alerting on every exception treats those cases alike and can bury the failures that matter.
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NestJS’s built-in global exception filter handles HttpException and its subclasses. It does not log these built-in HTTP exceptions by default, because they commonly represent expected application flow. For an unrecognized exception, the default HTTP response has status 500 and the message Internal server error. The response is intentionally generic; it does not describe the underlying cause to the caller. NestJS exception filters documentation.
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Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Clear out junk files and repair common Windows errorsFree Scan →Monitoring policy is a separate decision. NestJS Observe documents that intentional exceptions such as NotFoundException and validation errors may be visible in its Errors view without counting as new defects for alerting. Its documented defect signals include unhandled 5xx HTTP requests and failures from non-HTTP entry points that have no HTTP status. That behavior describes NestJS Observe; other SDKs have different defaults and configuration. NestJS error-monitoring documentation.
#1 Best Overall
Classify HTTP failures before alerting
Use the HTTP status and how the exception was handled to define what deserves attention. A handled 4xx response can be useful to inspect—for example, to identify a recurring validation problem—without being an application-defect alert for every occurrence. An unhandled server error is a different signal and usually warrants investigation.
- Expected, handled response: Keep it available for diagnostics or trend analysis if useful, but avoid treating every ordinary client or validation error as a new defect by default.
- Unexpected, unhandled failure: Capture enough context to investigate it and set alert rules around the server-side failure signal rather than every exception.
- Custom response or logging behavior: A custom exception filter can change the response shape or logging behavior. Ensure it does not silently swallow unexpected failures or prevent the monitoring integration from seeing them.
Filters and monitoring are complementary: a filter shapes the response, while instrumentation observes the failure. NestJS describes them as working side by side. NestJS error-monitoring documentation.
Give cron runs and queue jobs their own failure context
Background work can fail when no HTTP request is in progress. Request exception handling and request logs alone therefore cannot explain whether a scheduled run or queue job succeeded, failed, or is being retried.
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Rank #3
Queue workers pull jobs and expose lifecycle events, while NestJS tracing documentation covers queue-job context and scheduled handlers. Use the run or job outcome and the queue’s own lifecycle information to diagnose background failures; do not infer a job’s state from HTTP status codes. NestJS queues documentation and NestJS distributed tracing documentation.
Retries, queue configuration, and scheduling behavior vary by application. Preserve the failure reason and attempt context that your setup provides, and decide alert thresholds with the task’s retry behavior in mind rather than assuming one policy fits every worker or scheduler.
Check how your monitoring integration captures errors
Do not assume that registering a filter also guarantees SDK capture. NestJS says its own Observe SDK requires no handler registration, but that is not a general rule for third-party integrations. Verify the selected SDK’s guidance, particularly when the application has a global catch-all filter.
Sentry in NestJS 11
NestJS’s Sentry recipe says unhandled exceptions not caught by an error filter are reported by default, while HttpException instances are not captured by default because they often act as control-flow vehicles. If the application has a global catch-all filter, the recipe directs developers to decorate its catch() method with @SentryExceptionCaptured(). If there is no catch-all filter, it documents registering SentryGlobalFilter as an application filter; that filter must be registered before other exception filters. The recipe also covers uploading source maps to make stack traces readable. NestJS Sentry recipe.
The same recipe includes a debug endpoint that throws an error as an integration verification example. Treat it as a documented check to run in your own application, not as evidence that a particular deployment is already capturing errors correctly.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Choose monitoring by coverage and capture behavior
Rather than assuming one monitoring option is universally better, verify the behavior that matters in your application. Framework-native and third-party integrations can differ in which execution contexts they cover, which exceptions they capture by default, and how they handle custom filters.
- Execution contexts: Confirm coverage for HTTP requests, scheduled handlers, and queue consumers—not only web requests.
- Capture defaults: Check the treatment of handled
HttpExceptioninstances, unhandled errors, and exceptions intercepted by global filters. - Job details: Determine whether a failed run exposes its reason and attempt or retry context.
- Diagnostic context: Check whether the integration provides useful stack traces, source maps, request or run context, logs, and traces.
- Alert policy: Confirm whether expected control flow can remain visible without generating defect alerts, and whether job failures can be governed by suitable alert rules.
NestJS Observe documents support for error monitoring across HTTP and background execution contexts, while the Sentry recipe describes its NestJS integration and source-map setup. Consult each integration’s documentation for its own behavior and configuration rather than assuming matching defaults. NestJS error-monitoring documentation and NestJS Sentry recipe.
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