@Override
    protected void buildAuditMessage(StringBuilder builder) {
      super.buildAuditMessage(builder);

      builder
        .append(", Principal(")
        .append(principal)
        .append("), Hostname(")
        .append(hostName)
        .append("), Keytab file(")
        .append(keyTabFilePath)
        .append(")");
    }
Principal that belons to the keytab file
ambari-server/src/main/java/org/apache/ambari/server/audit/event/kerberos/CreateKeyTabKerberosAuditEvent.java