I like to inform about the possibility to use Oracle Configuration Manager (OCM) to upload configuration data to my Oracle Support to be informed about patch recommendations and health checks.
In case you like to know the patch recommendations of your Weblogic Server without the usage of OCM, then you can use the "Recommended Patch Advisor" under Tab "Patches & Updates" -> "Patch Search" region -> menu "Recommended Patch Advisor"
Remote Diagnostic Agent (RDA) is a Diagnostic tool that is often used when more information about environment and collection of the log files is needed or specific areas needs to be tested for performance.
We recognized also more questions and issues from the usage of OCM with Weblogic for patch recommendations.
Therefore I like to highlight the importance to set the correct environment values for before you run the OCM setup and the use of Smart Utility version 3.3.0