This article provides a list of Knowledge Base resources on how to troubleshoot, setup and diagnose most common issues based on memory, CPU, license.
CTX228979 - Management CPU Increases Periodically In Citrix ADC
CTX226781 - Troubleshooting Memory on NetScaler
CTX215481 - Error: "Failure - TCP connection successful, but application timed out" on NetScaler
CTX213837 - How to Troubleshoot Citrix ADC(NetScaler) Reporting Tab Related Issues
CTX477279 - https://support.citrix.com/article/CTX477279/setup-syslog-for-splunk
CTX370618 - How to Diagnose IP Conflicts on the ADC
CTX464125 - How to Recognize NetScaler Gateway User Login and Logout Entries in ns.log
CTX570689 - How to verify hardware health status on NetScaler MPX
CTX225182 - Error "Packets dropped due to licensed throughput rate being reached" on NetScaler
CTX229555 - High CPU Usage on NetScaler VPX Reported on VMware ESXi Version 6.0
Tools and Resources
Below list of articles will provide you an outline of logs which will help you to easily identify a possible CPU, memory and fully hardware check when a possible capacity issue comes in place.