My Raspberry Pi is configured as a build node and stays online all the time. It currently reports 100 MB free swap space, 9 GB free disc space, and 9 GB free temp space. You may need to increase the size of the flash drive you're using with your Raspberry Pi to resolve the free disc space and free temp space issue.
I don't know how to increase the free swap space, though I suspect that will likely also involve allocating more space on a larger flash drive. You may need to check with users in a Raspberry Pi forum for more hints on configuring swap space on the Pi.
Mark Waite