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.
LightStep - We deliver insights that put organizations back in control of their complex software apps.
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.
Pepperdata - Pepperdata's software runs on existing Hadoop clusters to give operators predictability, capacity, and visibility for their Hadoop jobs.
Zabbix - Track, record, alert and visualize performance and availability of IT resources
Honeycomb - Honeycomb is a powerful tool for complex/distributed systems, microservices, and databases.