The interval between monitoring checks determines how quickly you discover an outage — but shorter intervals come with higher cost, more infrastructure complexity, and more alert noise. Choosing the right check frequency depends on your traffic patterns, your SLAs, and your team's capacity to respond.
What real-time monitoring actually means
True real-time monitoring checks every 30 seconds or less. Tools like Datadog, New Relic, and Pingdom offer this at various price points. At 30-second intervals, you discover most outages within a minute. At one-minute intervals you discover them within two minutes. The difference between 30 seconds and 60 seconds matters enormously for payment processors, trading platforms, and healthcare systems. For a company blog or portfolio site, it is largely irrelevant.
The case for hourly monitoring
Hourly monitoring is appropriate for services where a short outage window is acceptable — internal tools, staging environments, low-traffic marketing sites, and monitoring for trend analysis rather than incident response. It is also appropriate for the kind of observability checks that are too expensive to run at high frequency, like Google PageSpeed Insights API calls for SEO monitoring. VP Watchtower runs hourly checks because it is designed as a showcase tool, not a production alerting system.
Alert fatigue at high frequency
One underappreciated cost of high-frequency monitoring is alert fatigue. A service that blips for 30 seconds every few days due to network hiccups will trigger constant alerts on a 30-second monitor and none on an hourly monitor. The right check interval is the shortest one that does not generate more noise than signal. Start with five minutes for production services and adjust based on the false positive rate you observe.
Layering different check frequencies
Mature monitoring setups use multiple frequencies for different check types. HTTP and TCP checks at one or five minutes catch availability incidents quickly. SSL checks at once per day are sufficient since certificates do not expire in hours. DNS checks at five minutes catch propagation issues during migrations. SEO checks at once per day or once per hour after a deployment are appropriate because PageSpeed scores change slowly. VP Watchtower runs all five check types hourly for simplicity in a showcase context.