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.
Amazon CloudWatch - Amazon CloudWatch is a monitoring service for AWS cloud resources and the applications you run on AWS.
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.
Google StackDriver - Stackdriver provides monitoring services for cloud-powered applications.
Zabbix - Track, record, alert and visualize performance and availability of IT resources
AWS Config - Cloud Monitoring