By default, upgrading a cluster that has custom catalogsources defined results in the custom catalogsources disappearing after the upgrade is complete. In order to retain the user-defined catalogsources, the user must supply them through extraManifests field. This step should be added to the official documentation.

4.15.0

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    1. Upgrade a cluster with a user-defined catalogsource without adding it to extraManifests
    

The catalogsource no longer exists on the upgraded cluster

Doc needed to explain that this step is required to keep custom catalogsources