Upgrade button in Admin Control Panel

Hi all

In the Administration section of ELGG, (using v2.2.3) there is a Flush the Caches button. Obviously clear what this does. But next to this is another button: "Upgrade".

Can anyone briefly point me to some documentation on the purpose or function of this button, or if the documentation does not show it, can someone kindly explain to me what the purpose and use is for this button?

Why and when would I click on this?

I appreciate the guidance.

Kind regds

Len

Performance and Scalability

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