By default foreman.socket binds to IPv4 only. This was done to make matching it in Puma easier, but it's not really what should be done in 2021 where everything should be dual stack by default.
In aecc3187253ada61a311b5229d215452bd6d67b7 the need for this matching in Puma was removed which makes it much more flexible. The default should be updated.
Note that the installer currently always overrides it so it's not really a difference for most, but I want to modify the installer to rely on the default.
Added by Ewoud Kohl van Wijngaarden about 3 years ago
Fixes #32238 - Bind systemd socket to IPv6
By default foreman.socket binds to IPv4 only. This was done to make
matching it in Puma easier, but it's not really what should be done in
2021 where everything should be dual stack by default.
In aecc3187253ada61a311b5229d215452bd6d67b7 the need for this matching
in Puma was removed which makes it much more flexible. The default
should be updated.
Note that the installer currently always overrides it so it's not really
a difference for most, but I want to modify the installer to rely on the
default.