/etc/cron.d/neutron-l3-agent-netns-cleanup is in neutron-common 2:8.0.0-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | # vim: set filetype=crontab:
# Periodically cleans Neutron's network namespaces on behalf of the Neutron
# L3 agent.
0 * * * * neutron if [ -x /usr/bin/neutron-netns-cleanup ] ; then /usr/bin/neutron-netns-cleanup --config-file=/etc/neutron/neutron.conf --config-file=/etc/neutron/l3_agent.ini >/dev/null 2>&1; fi
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