use specific hacking rules

Change-Id: I91cb5e30ec081262e2a590d64ba46fddadc7590f
Expose some SLO constraints via /info

These are the ones that affect what requests a client can make; the
others are just time and speed limits, so they weren't as interesting.

Change-Id: I21c19c950227f02725aafc309a3996fc6749a383
Merge "Expose some SLO constraints via /info"
Merge "use specific hacking rules"