I set up the DJigger Collector and configured some hosts in the csv file, i.e.
I believe you are searching data that isn't referenced via the "host" nor "hostname" keys.
When using the CSV file format for configuring JMX connections in collector mode, you need to keep in mind that there are two types of information on each line (for each connection definition) :
The mendatory technical properties are not used as medata per default.
Therefore, if you wish to identify a JVM based on the hostname of the machine it is running on, I would suggest using the following config line (see the values I added in the last two columns) :