DHCPv6 and on_commit etc events

[perl-list]

ISC DHCP version: 4.3.3

I need some help in finding information about what sort of options are available in in on_ events in DHCPv6. I can't seem to find any man pages or so on that describe what can be logged with these events (on commit, on expiry, on release). I have things being logged for DHCPv4 like so: 

on commit { 
  log( error, 
    concat( "LEASED,", 
      "ip,", binary-to-ascii (10, 8, ".", leased-address),",", 
      "time,",binary-to-ascii(10,32,"",encode-int (lease-time,32)),",", 
      "hardware,",binary-to-ascii(16,8,":",substring(hardware,1,7)) 
    ) 
  ); 
}

on expiry {
  log( error,
    concat( "LEASEEXPIRY,",
      "ip,", binary-to-ascii (10, 8, ".", leased-address)
    )
  );
}

on release {
  log( error,
    concat( "RELEASED,",
      "ip,", binary-to-ascii (10, 8, ".", leased-address),",",
      "hardware,",binary-to-ascii(16,8,":",substring(hardware,1,7))
    )
  );
}

Would like to do something similar in DHCPv6.  Have begun testing with on commit.  Apparently the same sorts of data are not available as the same on commit { } directive from above produces these log messages:

Oct 30 13:58:45 DHCPserver dhcpd: data: "leased-address" configuration directive: there is no lease associated with this client.
Oct 30 13:58:45 DHCPserver dhcpd: data: leased_lease: not available
Oct 30 13:58:45 DHCPserver dhcpd: data: hardware: no raw packet or lease is available

I realize the hardware address is probably not available as these packets are being relayed from a router that does not support RFC 6939 (are there any that do?).

Mainly, I'd like to see a man page or some sort of document that describes what IS available ... or some config I could drop in my dhcpd.conf that would log what is available or something... any ideas?