Datadog - See metrics from all of your apps, tools & services in one place with Datadog's cloud monitoring as a service solution. Try it for free.
Crisp Status Page - Monitor servers and let users know if something goes down.
AppDynamics - Get real-time insight from your apps using Application Performance Management—how they’re being used, how they’re performing, where they need help.
Robusta - SRE Copilot for Kubernetes
Zabbix - Track, record, alert and visualize performance and availability of IT resources
Komodor - The Kubernetes native troubleshooting platform