Throughput graph over 30 days old

not by default, and not after the fact, but if this is something you want to do going forward, JoshBecigneul has the best advice to use an external platform to pull these stats and store long term. You could modify the rrdtool files on each BIG-IP to do this as well, or add more that you could then query remotely, but these changes are likely not supported and would not survive a patch/upgrade, so you'd need a process to maintain it which adds a lot of complexity and opportunity for failure to system lifecycles.