Cloudflare Developers•4mo ago

Best place for viewing production logs? Moving from Vercel

I'm in the process of moving from Vercel to Pages, and I'm looking for the best way to replicate Vercel's Logs page (picture attached). I see that in CF in Deployment details > Functions, I can stream from one of the deployments and click in to see logs (and I can use Wrangler CLI to filter more closely). Am I correct that this is the closest to the Vercel Logs page? Also, I notice that when I send back a 400 via nextjs, the CF logs (both in the dash and via wrangler) say OK. Browser correctly shows the 400 as an error.

{
  "outcome": "ok",
  "event": {
    ...
    "response": {
      "status": 400
    }
  }
}

{
  "outcome": "ok",
  "event": {
    ...
    "response": {
      "status": 400
    }
  }
}

8 Replies

Chaika•4mo ago

I'm not sure about Vercel's log page but the tail with Workers is only transient/doesn't keep logs. There's plugins for Sentry and Honeycomb if you wanted longer storage

Chaika•4mo ago

The outcome != http status, that outcome there is just saying the worker finished executing without any issues https://developers.cloudflare.com/workers/runtime-apis/handlers/tail/#properties-1

kyle•4mo ago

ah ty, okay will look into sentry or something else. yeah vercel saves the last 100k logs for pro tier, which is very helpful and ty for clarifying on outcome != http status. do you know if there's a way to see errors more directly in the log? would I need to look into each worker log to see if there were any real errors? or maybe this can be done via wrangler

laurent•3mo ago

I dug super deep into this issue 3 months ago, I haven't found a way to persist logs. I think that feature will stay on the backlog for a while, unfortunately. What I did is use separate workers for critical parts of the app (stripe hooks), so that I can logpush to R2. I haven't found a way to conveniently view logs from R2 though. Following the same logic I'm tempted with moving all the backend (except the next auth stuff because I'm scared haha) to hono on a worker, and logpush to R2. Let me know if you find a better way!

kyle•3mo ago

I ended just using https://axiom.co/. They have a very, very generous free tier

Axiom

Stop sampling, observe every event – Axiom

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Brad•3mo ago

^ very cool , thanks for sharing. Also leaving Vercel following their pricing changes.

Joe Simpson•3mo ago

I'm using baselime.io (free) - had to implement their edge-logger, but that was quick to do: https://baselime.io/docs/sending-data/platforms/cloudflare/edge-logger/

Edge Logger | Baselime - The cloud-native observability platform

Cloudflare Logpush is not available in all Cloudflare edge environments. In those environments, it's necessary to emit logs from within the process.

Joe Simpson•3mo ago

Baselime was recently acquired by Cloudflare

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Best place for viewing production logs? Moving from Vercel