Number or name of the port to access on the pods targeted by the service.
Number must be in the range 1 to 65535. Name must be an IANA_SVC_NAME. If
this is a string, it will be looked up as a named port in the target
Pod's container ports. If this is not specified, the value of Port is
used (an identity map). Defaults to the service port. More info: releases.k8s.io/HEAD/docs/user-guide/services.md#defining-a-service