Generates an identifier for all the signals created during a period of time. The idea of a session is to provide a context that covers many transactions that a user did in order to fulfil their needs using an application. For most apps, a session could start when the user opens the app, and end when the user closes the app, or when the app is forced to get closed due to an unexpected error. But for other apps, such as a ticketing app for a queue in a bank for example, the app will always be open, but a session might start when a person starts the process to get a new ticket, and end when the ticket is printed.