https://www.siteuptime.com/terms.php
SiteUptime - Website and Server Monitoring Service
Siteuptime provides website monitoring services. Receive instant email and SMS alerts when your website becomes unavailable. View detailed uptime statistics...
server monitoring service
https://www.digitalocean.com/products/uptime-monitoring
DigitalOcean Uptime | High Performance Server Monitoring Service
Collect metrics, monitor application performance, and receive alerts if infrastructure issues arise with DigitalOcean Uptime.
server monitoring servicehigh performancedigitaloceanuptime