High disk i/o on idle installation

[Adam Israel]

Installed from master this afternoon and I notice a load of 9 on an idle system. I also noted high disk i/o:

Running `iostat 3` shows me pretty consistent write operations on /dev/vda, mounted at /.

avg-cpu: %user %nice %system %iowait %steal %idle
           3.70 0.00 2.61 56.02 0.08 37.58

Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn
loop0 0.00 0.00 0.00 0 0
loop1 0.00 0.00 0.00 0 0
loop2 0.00 0.00 0.00 0 0
loop3 0.00 0.00 0.00 0 0
loop4 0.00 0.00 0.00 0 0
loop5 0.00 0.00 0.00 0 0
loop6 0.00 0.00 0.00 0 0
loop7 0.00 0.00 0.00 0 0
vda 28.67 0.00 378.67 0 1136
loop8 0.00 0.00 0.00 0 0
loop9 0.00 0.00 0.00 0 0

Watching io stats via `iotop` might be useful.

I think we need to investigate and try to determine what's causing the high disk usage (microk8s vs. cdk, for example), and make sure relationship join/changed handlers aren't firing more than they're supposed to.