Comment 1 for bug 1922778

Some proof of observation of the issue:

$ cat /proc/sys/net/nf_conntrack_max
262144
$ cd /etc/sysctl.d
$ grep conntrack *
50-nova-compute.conf:net.nf_conntrack_max=1000000
50-nova-compute.conf:net.netfilter.nf_conntrack_buckets=204800
50-nova-compute.conf:net.netfilter.nf_conntrack_max=1000000
50-openvswitch.conf:net.nf_conntrack_max=2000000
50-openvswitch.conf:net.netfilter.nf_conntrack_buckets=204800
50-openvswitch.conf:net.netfilter.nf_conntrack_max=2000000
$ ls -l 50-nova-compute.conf 50-openvswitch.conf
-rw-r--r-- 1 root root 346 Dec 15 21:02 50-nova-compute.conf
-rw-r--r-- 1 root root 346 Sep 20 2020 50-openvswitch.conf
$ date
Tue Apr 6 17:33:42 UTC 2021
$ uptime
 17:33:43 up 24 days, 4:00, 3 users, load average: 4.83, 7.68, 8.78

It appears this has been fixed for charm-neutron-gateway per https://bugs.launchpad.net/charm-neutron-gateway/+bug/1885192 and should be applied to these two charms.