Looking for hidden production issues on VPS

When something breaks, we check:

CPU
RAM
Errors

…but sometimes everything looks fine and your app is still dying.

I ran into this while launching my SaaS:

No spikes
No crashes
No clear errors

But things felt off.

Turns out:

• logs quietly filling disk
• background jobs retrying forever
• small bugs stacking up
• no visibility into real user issues

Nothing crashed.

It just slowly suffocated.

Now I trust one rule:

If everything looks normal, something is probably wrong.

Curious — what’s the most invisible issue that broke your production?