Website Uptime Metrics: A Guide to What to Measure

In order to fully understand how your website monitoring services work, it is imperative to know what uptime statistics mean to you and your website.

Here are some common uptime statistics to familiarize yourself with in order to better interpret your reports.

  • Domain health check monitors your entire domain, including but not limited to web, DNS, email and blacklist.
  • RUM report refers to a Real User Monitoring report.
  • The number of outages is the number of instances your site experienced an outage of any kind.
  • The number of failed checks is the number of instances your website failed to respond after the service sent a “ping” to your website. The average response time is the average amount of time it took your site to respond to the server.
  • The DNS lookup time is the amount of time it takes a browser to complete a required domain lookup while getting a resource.
  • Download time is the time passed after connectng to your webpage or server, where the download request is performed.
  • The uptime percentage is the percent amount of time your site was up and available.
  • The full-page download time is the amount of time it took your page to fully download for the service.
  • Link validation responses show which links are validated and working after being checked.
  • Resolve time is the amount of time it takes to translate a domain name or URL to a corresponding IP address.
  • Connection time is the amount of time it takes to connect to the IP address of your webpage or server.

Putting the numbers into perspective

Uptime is generally measured in percentages, like 99.9%. A website that experienced 99.9% uptime has experienced 8.76 hours of downtime per year, and 43.8 minutes of downtime per month. A website that experienced 99.99% uptime has experienced 52.56 minutes of downtime per year, and 4.38 minutes of downtime per month.

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