Maintenance release validation after the Service pack or Cumulative fix pack installation on AEM

Statement :  What are the ways to install/Validate Service pack or cumulative fix pack

Solution :

Installation Methods 

• Package Manager UI ✔ 
• Package Manager HTTP API (Curl) ✔ 
• File System (crx-quickstart/install) !  
• Bootstrap ✖

Installation Validation:

• OSGi bundles state 
• Sub Packages
• Error logs
• Sling OSGi Installer Mbean : Active -> false, ActiveResourceCount -> 0 
• Product version (/system/console/productinfo) 
• Package Manager Activity Logs 
• Last but not the least – Do a hands on sanity  test to ensure AEM is good to use post installation