/etc/ctdb/nfs-rpc-checks.d/30.lockd.check is in ctdb 2:4.2.14+dfsg-0+deb8u9.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2
-ge 15 verbose restart:b unhealthy -eq 10 restart:b