Form this outage is expected to take, which can take one of the
following values:
OUTAGE: The Interconnect may be completely out of service for
some or all of the specified window.
PARTIAL_OUTAGE: Some circuits comprising the Interconnect as a
whole should remain up, but with reduced bandwidth. Note that the
versions of this enum prefixed with "IT_" have been deprecated in
favor of the unprefixed values.