[BUG report]Cannot show DHCPv6 statistics correctly

BUG report: DHCPv6 statistics cannot be shown correctly

Describe the bug

I have setup Kea DHCPv6 service and it can assign IPv6 address and prefixes. However, stork cannot read the IPv6 leases correctly. (assigned number always 0)

When I check the log, I found stat-lease4-get is called in kea-dhcp6.commands:

finally I found this line in backend/appctrl/kea/leasecmds.go:

Should it be replaced by stat-lease6-get?

To Reproduce

Steps to reproduce the behavior:

1. Install Kea and Stork v1.18
2. DHCPv6 Client gets an IPv6 address and an IPv6 prefix from kea
3. check stork, the number of DHCPv6 assigned addresses and prefixes are always 0

Expected behavior

Stork can show the number of assigned DHCPv6 addresses and prefixes, like DHCPv4 in stork does.

Suggested modification In backend/appctrl/kea/leasecmds.go:

const (
	Lease4Get            CommandName = "lease4-get"
	Lease6Get            CommandName = "lease6-get"
	Lease4GetByClientID  CommandName = "lease4-get-by-client-id"
	Lease6GetByDUID      CommandName = "lease6-get-by-duid"
	Lease4GetByHostname  CommandName = "lease4-get-by-hostname"
	Lease6GetByHostname  CommandName = "lease6-get-by-hostname"
	Lease4GetByHWAddress CommandName = "lease4-get-by-hw-address"
	StatLease4Get        CommandName = "stat-lease4-get"
	StatLease6Get        CommandName = "stat-lease6-get"
)