Email and SMS Notification
If your web server becomes unavailable, these notifications will let you know. Budget web server monitoring plans might charge extra for SMS messages above a certain threshold, say 20 per month.
Uptime reports
These present the uptime data captured by the monitor in charts and graphs. This information can help you validate 99.x% availability claims by your host.
Performance Reports
These present the performance data captures by the monitor. Basic reports might include average download time for a page. More sophisticated reports will break out the DNS connect time, the TTFB (time to first byte) and TTLB (time to last byte).
Global Monitoring Locations
If your web server monitor runs from a single location, it may encounter a temporary connectivity problem. You'll suddenly receive notifications that every URL you monitor is failing. This usually indicates a problem with the monitoring company's ISP or perhaps a larger Internet connectivity issue. For example, two large ISP's might have a contract disagreement and decide not to honor peering agreements. A web server monitor with multiple monitoring locations should be able to find a viable route to your website. You would still receive outage notifications from some sites, but the additional locations will provide peace of mind that your web application is functioning correctly.
Protocol or Port Monitoring
In addition to monitoring web pages, you can monitor protocols and ports including ping, HTTP, DNS, SSH, SMTP, POP3, IMAP, MySQL, etc.
SSL Certificate Validation
If the SSL certificate expires on a server, all https pages will show errors. This also occurs when an administrator misconfigures the SSL certificate.
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