code: func isIssuedPastDeadline(csr *capi.CertificateSigningRequest) bool {
  	for _, c := range csr.Status.Conditions {
  		if c.Type == capi.CertificateApproved && isIssued(csr) && isOlderThan(c.LastUpdateTime, approvedExpiration) {
  			klog.Infof("Cleaning CSR %q as it is more than %v old and approved.", csr.Name, approvedExpiration)
  			return true
  		}
  	}
  	return false
  }
docs: // isIssuedPastDeadline checks if the certificate has an Issued status and the
  // creation time of the CSR is passed the deadline that issued requests are
  // maintained for.