I'm building a lightweight uptime monitor for small sites and side projects. The basic approach is to request each URL every few minutes and mark it as unavailable when a check fails, but that creates false positives from slow responses, CDN glitches, or temporary network problems.
I've tried retrying two or three times, though that delays legitimate alerts. Monitoring from one region keeps costs low but can mistake a regional connectivity issue for an outage. I'm considering multi-region checks that require agreement from at least two locations, but that may be too expensive for a small free tier.
For a small-scale monitoring service, is smart retry logic with backoff usually enough, or is checking through multiple regions or independent connections worth the extra cost? Would you use different alert sensitivity for free and paid plans, or keep the behavior consistent?
3 Answers
A status code or successful connection alone may not prove that the application is healthy. Add an optional content check for a known phrase or expected page element, and consider checking for obvious application errors. A site can return HTTP 200 while showing a database failure page, so content validation can catch incidents that a basic ping misses.
For a small number of relatively stable sites, a few retries are often enough. Three attempts with a short delay or backoff keeps occasional blips from generating alerts without requiring a large monitoring network. You can accept a little extra detection time in exchange for fewer noisy notifications.
Instead of treating every check as a binary up-or-down result, maintain a reliability score over time. Track recent pass rate, total uptime, consecutive successes and failures, and how much history the target has. Smooth the score so a newly added site with only a few successful checks doesn’t appear more reliable than a site with a long record. This gives you a better view of service quality, although it works alongside alerts rather than replacing them.
That matches my situation. I’d rather wait a couple of minutes for a more reliable alert than notify someone every time there’s a brief network hiccup.