Raise ocg health check limits to 400k/800k

18:08 < cscott> i'd probably warn at 400k and critical at 800k, looking at graphite today
18:08 < cscott> and i'm fine if you want to go ahead and do that now.  i'm going to continue to be keeping an eye on this over the next week to understand typical load better.

Change-Id: I2e969fec629395bdfd6e282445a7b07f6a4f4476