// IngressRuleValue. If the host is unspecified, the Ingress routes all
  // traffic based on the specified IngressRuleValue.
  //
  // host can be "precise" which is a domain name without the terminating dot of
  // a network host (e.g. "foo.bar.com") or "wildcard", which is a domain name
  // prefixed with a single wildcard label (e.g. "*.foo.com").
  // The wildcard character '*' must appear by itself as the first DNS label and

  // IngressRuleValue. If the host is unspecified, the Ingress routes all
  // traffic based on the specified IngressRuleValue.
  //
  // host can be "precise" which is a domain name without the terminating dot of
  // a network host (e.g. "foo.bar.com") or "wildcard", which is a domain name
  // prefixed with a single wildcard label (e.g. "*.foo.com").
  // The wildcard character '*' must appear by itself as the first DNS label and

  // IngressRuleValue. If the host is unspecified, the Ingress routes all
  // traffic based on the specified IngressRuleValue.
  //
  // Host can be "precise" which is a domain name without the terminating dot of
  // a network host (e.g. "foo.bar.com") or "wildcard", which is a domain name
  // prefixed with a single wildcard label (e.g. "*.foo.com").
  // The wildcard character '*' must appear by itself as the first DNS label and

  // presented as-is to a reader.
  // +optional
  optional string message = 2;

  // The field of the resource that has caused this error, as named by its JSON
  // serialization. May include dot and postfix notation for nested attributes.
  // Arrays are zero-indexed.  Fields may appear more than once in an array of
  // causes due to fields having multiple errors.
  // Optional.
  //
  // Examples:

  // Accessible property names are escaped according to the following rules when accessed in the expression:
  // - '__' escapes to '__underscores__'
  // - '.' escapes to '__dot__'
  // - '-' escapes to '__dash__'
  // - '/' escapes to '__slash__'
  // - Property names that exactly match a CEL RESERVED keyword escape to '__{keyword}__'. The keywords are: