code: func (h *Health) Service(service, tag string, passingOnly bool, q *QueryOptions) ([]*ServiceEntry, *QueryMeta, error) {
  	var tags []string
  	if tag != "" {
  		tags = []string{tag}
  	}
  	return h.service(service, tags, passingOnly, q, false)
  }
docs: // Service is used to query health information along with service info
  // for a given service. It can optionally do server-side filtering on a tag
  // or nodes with passing health checks only.