Graphs Last Update Time + Upgrade to Php 7.4

I would appreciate if some one could provide some pointers on below queries.

Q#1) Where I can see the LAST UPDATE time in graph to confirm when was the graph values updated.
Q#2) I have librenms ver 1.69-1-gbc02ab3 - on Ubuntu server ver 16. How can I upgrade only PHP 7.4 without destroying the existing installation of Librenms.

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