Stork not pulling lease stats for DHCP4

name: Stork not pulling lease stats for DHCP4
about: Stork colocated on a single kea-dhcp4/6 host running Kea 1.8.0 and Stork 0.11 is not reporting DHCP4 lease statistics.

Describe the bug I have a single DHCP VM built with Kea version 1.8.0 and Stork 0.11 running on CentOS 7 using prebuilt packages. It's sole purpose is to serve as a DHCP helper for a small regional network. It's currently got 3 IPv4 ranges and 4 IPv6 ranges. The IPv4 ranges contain approximately 1000 IPv4 addresses, and the IPv6 ranges are /64's with prefix delegation handing out /56's from a larger /48 block.

Stork is working fine, on non-standard ports, however the DHCP4 statistics never report. IPv6 statistics, including leases AND prefix-delegations report just fine. Looking at the stdout for the isc-stork-server process, I see the following repeating errors every minute:

statspuller.go:59 missing key total-addreses in LocalSubnet 4 stats statspuller.go:59 missing key total-addreses in LocalSubnet 5 stats statspuller.go:59 missing key total-addreses in LocalSubnet 6 stats

Additionally,

To Reproduce Steps to reproduce the behavior:

Install Kea 1.8.0, Stork 0.11 from package manager in CentOS 7.
Configure kea-ctrl-agent, kea-dhcp4, kea-dhcp6, and agent.env, server.env as attached.
DHCP Processes work, clients receive addresses and IPv6 Prefix Delegations.
Kea functions as expected.
Stork does NOT display DHCP4 statistics, DOES display DHCP6 statistics.

Expected behavior I expect stork to display both DHCP4 and DHCP6 statistics for all discovered ranges.

Environment:

Kea version: 1.8.0
Stork: 0.11.0
OS: CentOS 7.8
Kea: Using MySQL backend, but memfile and PSQL backend also compiled in.
Kea: Using libdhcp_stat_cmds.so and libdhcp_lease_cmds.so on both DHCP4 and DHCP6. agent.env