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The avr-core-sensor library focuses on managing, initializing, and polling sensors. There is a hard dependency on the core-avr-database library.
The entry point for managing sensors is SensorManager. New Sensor instances are added to the manager with a corresponding SensorConfig. The config holds information that informs the SensorManager how to use the Sensor.
SensorManager::update() is called on an update loop. The manager then moves through the list of Sensors it maintains and polls them according to the configuration. Collected data is saved to a persistent store by creating and maintaining Database instances from DatabaseManager.
Sensor data is informed by the backend storage mechanism which you can read more about in the core-avr-database: Storage document. Effectively, each sensor may return one or many floating point values which are then stored by timestamp.