In runlevel 1, the platform constructs eager beans.
In runlevel 3, the platform host installs activator microfrontends.
From runlevel 2 and above, messaging is enabled. This is the default runlevel at which initializers execute if not specifying any runlevel.
In runlevel 0, the platform host fetches manifests of registered micro applications.
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Runlevels are used to control in which startup phase to execute initializers when starting the platform.
The platform reports that it has started after all initializers have completed successfully.