Jira notifications inbox - what is shown?

[Mark Wheeler]

Does anyone know what notifications are shown in the Jira Notification Inbox?

I realise it shows notifications on issues where you are mentioned or assigned issues, depending you your notification scheme at project and personal settings level, BUT ... how many notifications are shown and/or for how long?

For example: last 100 notification or last month of notifications?

I think it's the last month of notifications. When you scroll down and up it shows more and more as you repeat this action. 

Is this behaviour configurable?  Can I say show last 2 months or show last 20 notifications for example?

Thanks

Mark