Ask HN: What is your server-side/back-end monitoring checklist?

Sample Monitoring Checklist:

* Load Balancer [How do you check for its health status?]

* Web-Server

* App-Server [CPU utilization, Memory utilization, Disk Utilization, App Status to take requests]

* DB-Server [CPU utilization, Memory utilization, Disk Utilization, App Status to take requests]

Note: Possibly share at what level you check for these, at what frequency and what tools you use.