I haven’t intently changed anything relating to rrd’s storage directory. I don’t see any Libre settings directing it to a different location, so I suspect that’s not the right tree to be barking up, but then again, I’m the one with a broken install that Google hasn’t been able to help me fix.
Also, as I had mentioned, if I turn off rrdcached, graphing works again.
I think I’m on to something. I think the documentation is bad.
Note my /etc/default/rrdcached. I changed that base_path to /opt/librenms/rrd/ and my graphs are no longer red. My RRDTool Output on the libre page now has the line OK u:0.18 s:0.04 r:0.22 added to the bottom. I see some lines on the graphs now, but there’s a big gap. If new data starts appearing, I’ll call it good and submit another documentation fix.