Current Behavior:

"Components and minimum version requirements" section is confusing regarding Redis requirements. With the current description it looks like it is needed two Redis instances for 3scale backend component which is not:

System-app component:
 * MySQL: 8.0.0
 * PostgreSQL: 10.0.0

Backend component:
 * Redis: 6.2 (two instances required)
 

 
Expected Behavior:

 Make clear that one Redis instance is needed for system component and the other one is needed for backend component:
 

System-app component:
 * MySQL: 8.0.0
 * PostgreSQL: 10.0.0
 * Redis: 6.2

Backend component:
 * Redis: 6.2
 

Link to the documentation affected:

https://docs.redhat.com/en/documentation/red_hat_3scale_api_management/2.15/html/migrating_red_hat_3scale_api_management/upgrade-operator#components-and-minimum-version-requirements