Most developers find out their site is down the same way: a Slack message from a coworker, or worse, a customer email. By then it's already cost you.
Here's the actual gap — your server can be completely broken while your last deploy log says everything's fine. A crashed process, an expired SSL cert, a database connection pool exhausted — none of these show up unless something is actively checking from the outside.
The pattern that closes this gap:
An external check, not an internal one. Your own server can't tell you it's down — if it's down, it can't send anything. You need a separate service pinging your URL from outside your infrastructure.
A short check interval. Checking every 30 minutes means up to 30 minutes of silent downtime. Every 60 seconds means you know almost immediately.
An alert channel you actually check in real time. Email is where alerts go to die — buried under newsletters and receipts. Something like Telegram, Discord, or Slack behaves like a push notification instead.
SSL expiry monitoring as part of the same check. An expired cert throws a browser security warning, not a downtime page — and it's entirely predictable months in advance, yet still catches people off guard constantly.
I ended up building this pattern into PingKeeper after getting burned by exactly this — free for 10 monitors with 4-minute checks and instant alerts via Telegram/Discord/Slack, no card required. But honestly, the pattern matters more than which tool you use — if you're rolling your own with a cron job and a curl request, the same four points apply.
Curious what others are using for this — cron + custom script, or a hosted tool?
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