Google Cloud Platform Security Overview - Cloud Workload Protection Platforms
Pingdom - With website monitoring from Pingdom you will be the first to know when your website is down. No installation required. 30-day free trial.
Qualys - Qualys helps your business automate the full spectrum of auditing, compliance and protection of your IT systems and web applications.
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
Nutanix Beam - Nutanix Beam is a multi-cloud optimization service
Better Uptime - We call you when your website goes down