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The Configure event in OpsWorks is primarily triggered by instances entering or leaving an online state. This event is part of the OpsWorks lifecycle events, which dictate what actions can be performed during different phases of an instance's lifecycle.

When an instance transitions to the online state, it indicates that the instance is ready to receive configuration commands. This is a crucial time to execute configuration scripts and ensure that the applications and services running on that instance are properly aligned with the desired state defined in the OpsWorks stack.

While adding a new application, finishing instance booting, or removing an instance from a stack are important activities within OpsWorks, they do not directly trigger the Configure event in the same way as entering or leaving the online state does. The Configure event focuses specifically on scenarios where the instance is active and available for configuration updates, aligning resources with the settings and applications that have been specified in the stack configuration.