The second golden rule is that results files should either be csv or xml format. But this is not just the selection made in the simple data writer listener (see below), but crucially
The reason for this is the controller makes decisions based on this filename ending. It collates .csv files but does not collate .xml files, rather just copies them all over to the main results folder.
Also, do not use .jtl files
This rule is because .jtl files are used for the Jenkins solution and are built interactively by the results analysis script. Any other jtl files in the Jenkins workspace will break the Jenkins CI reporting. See the Jenkins page for details.
Note also, if header titles are selected in the csv files, you will need to sort this out by hand as they will be collated to the bottom of the completed results and there will be as many lines of them as there are injectors. See below for details.
Controller code snippet for .csv files: