We are seeing connection errors to the proxy occasionally. These errors
do not result in a logged http request or error to the backends,
resulting in a theory that the proxy itself may just not be able to
handle the number of connections. More than double the total number of
connections that will be accepted by the proxy in an attempt to fix
this.
Change-Id: Iefa6c43451dd1f95927528d2ce0003c84248847f
Related-bug: 1630664