Fires when the game instance is shutting down, immediately before services and instances are torn down. On the server this occurs when the last player leaves or the server is closed; on the client it fires when the player leaves the experience.

Connect to this event to perform final cleanup such as saving player data with DataStoreService. Handlers run synchronously — the engine waits for all connected callbacks to return before proceeding with shutdown.

Returns the service with the given class name only if it has already been created. Unlike ServiceProvider:GetService(), this method does not create the service when it does not yet exist; it returns nil instead. If className is not a valid service name, the method throws an error.

This method is thread-safe and can be called from any thread context. It is useful when you need to check whether a service is present without triggering its initialization, for example during cleanup or conditional logic that should not force service creation.

Returns a service with the class name requested. When called with the name of a service (such as Debris) it will return the instance of that service. If the service does not yet exist it will be created and the new service is returned. This is the only way to create some services, and can also be used for services that have unusual names, e.g. RunService's name is "Run Service".

Note:

• This function will return nil if the className parameter is an existing class, but the class is not a service.
• If you attempt to fetch a service that is present under another Object, an error will be thrown stating that the "singleton serviceName already exists".

Fires after a service is added to the DataModel. The service parameter is the Instance of the newly added service. Because services are created lazily (the first time ServiceProvider:GetService() is called for them), this event lets you react to a service becoming available without polling for it.

Fires just before a service is removed from the DataModel. The service parameter is the Instance that is about to be removed. This event fires during DataModel teardown, giving listeners a chance to disconnect from the service or release references before the service is destroyed.