Re: `api_z1/0' is not running after update to CF v231
Can you verify that you are using the latest bosh-lite stemcell 3147? Older stemcells are known to have issues with consul which is what many of the CF components use for service discovery.
Latest bosh-lite stemcells can be found at http://bosh.io Just search for lite.
See this similar issue: https://github.com/cloudfoundry/cf-release/issues/919