Values:
UNSPECIFIED (0):
Diversion method unspecified.
COOKIE (1):
Diversion based on a specially named cookie,
"GOOGAPPUID." The cookie must be set by the
application itself or no diversion will occur.
IP (2):
Diversion based on applying the modulus
operation to a fingerprint of the IP address.
RANDOM (3):
Diversion based on weighted random
assignment. An incoming request is randomly
routed to a version in the traffic split, with
probability proportional to the version's
traffic share.