...
As mentioned above, EMCO provides for the addition of controllers to perform specific placement and action operations on a Composite Application prior to it being deployed to a set of clusters.
This sequence diagram illuillustrates how action and placment controllers are registered with orchestrator. Later on, the part of the sequence where the orchestrator is preparing the AppContext for a composite application, the controllers are invoked in priority order to update the AppContext per their specific function is shown.