We will need a lambda to failover to if the first lambda fails. This
isn't so much a case of the lambda itself failing, as it is a cross
availability zone resource automatically, it's more in case something in
the networking goes down in our AZ and therefore the lambda can't call
out to the CBC. In this case, we will be able to swap to using the
second AZ by calling the second lambda.
9da8e54d69