[▲ Vercel Community](/) · [Categories](/categories) · [Latest](/latest) · [Top](/top) · [Live](/live)

[Feedback](/c/feedback/8)

# Vercel Observability Alerts support for 404 anomaly detection alongside 5xx errors

18 views · 10 likes · 6 posts


Thanaen (@thanaen) · 2026-04-01 · ♥ 3

Currently, the `Alerts` feature under `Observability` monitors two types of anomalies: usage anomalies and error anomalies (`5xx` status codes).

It would be great to extend error anomaly detection to also cover **404 spikes**. A sudden increase in `404`s can indicate broken links after a deployment, misconfigured rewrites/redirects, or SEO issues — all of which are worth catching early, just like `5xx` errors.

## Use Case
After deploying route changes, a spike in `404`s would be the earliest signal that something went wrong, before users start reporting broken pages.

## Proposal
Add an optional “4xx anomaly” (or at least “404 anomaly”) alert type alongside the existing error anomaly, using the same statistical detection approach.


Pauline P. Narvas (@pawlean) · 2026-04-02 · ♥ 2

This is an excellent feature request that would complement the existing error anomaly detection nicely!

As a workaround for now, you could use Log Drains. 

https://vercel.com/docs/drains


Thanaen (@thanaen) · 2026-04-02 · ♥ 2

Thanks Pauline! And yes, this feature request is 100% inspired by true events. We had a deployment very recently that generated a… let’s say *generous* amount of 404s. Nothing like real-world pain to fuel good feature requests. 😄

We’ll look into Log Drains as a workaround, although it does look like a heavier setup!


Pauline P. Narvas (@pawlean) · 2026-04-02 · ♥ 1

Totally aligned with you! This would be so great natively.


Pauline P. Narvas (@pawlean) · 2026-04-02 · ♥ 3

@thanaen We've been cooking on this already internally is what I learned! :smiley: Will loop back!


Williamfarah65 8126 (@williamfarah65-8126) · 2026-04-02

nice one dear