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The first parameter guid you add a new guid. The default value is empty so you have to generate a new one. The second parameter subscription indicates which changetypes you want to listning for. The possible values can be found her DFE 2.0.0 - 3 Setting up Episerver. The default value is 1 which is AssetChanged. The last parameter deleteBlob indicates wether we should delete the blobs for the asset or not. In a loadbalanced invironment where you have multiple instances and each of the instances cantains it own local blob storage, then this should be true. If the blobstorage is share between the instances, then leave i false.
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