/etc/cron.d/neutron-dhcp-agent-netns-cleanup is in neutron-dhcp-agent 1:2014.1-0ubuntu1.
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 Quantum's network namespaces on behalf of the Quantum
# DHCP agent.
30 * * * * neutron if [ -x /usr/bin/neutron-netns-cleanup ] ; then /usr/bin/neutron-netns-cleanup --config-file=/etc/neutron/neutron.conf --config-file=/etc/neutron/dhcp_agent.ini >/dev/null 2>&1; fi
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