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.
Serilog - Backend Development and Utilities
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.
AWS CloudTrail - AWS CloudTrail is a web service that records AWS API calls for your account and delivers log files to you.
Zabbix - Track, record, alert and visualize performance and availability of IT resources
Sejil - Capture, view and filter your ASP.net core log events right from your app