Monitoring the Zenoss Collectors

Recently we have been trying out Zenoss core collectors - version 4.2.5 using a patched version of Egon's distributed collector code (to roll in some fixes that aren't present in the original) : https://github.com/resilientplc/ZenPacks.community.DistributedCollectors

However although it generally works I am having weird issues where when I change a device's collector then the new collector starts polling it - although the old collector is still polling it as well. I have verified this through using tcpdump on both new and old collector.

sudo tcpdump -i eth0 -c 500 -tttt -q "((port 161 or icmp or portrange 49152-65535) and host ${device/manageIp})"

If I restart the hub or old collector then it stops polling it - but is there a way for it to hand over cleanly

Also since I have added a User Command of the above tcpdump then is there a TALES expression that includes the devices collector I would like to write a small shell script to use the already existing ssh passwordless connection to log onto the remote collector and run the tcpdump command.

What I really want to do is find out if a collector (or hub) thinks it is supposed to be collecting from a device so I can validate and check that the hub-collector setup is actually working.

Any ideas