Especially because the ITSI module relies on, and leverages the Splunk metric store, Splunk 7.0.x or or higher is required.
The ITSI module has been tested and qualified against reasonably fresh versions of ITSI, recommended version is 3.1.0 and higher, previous versions may work as well although it has not and will not be tested.
Telegraf supports various operating systems and process architectures including any version of Linux and Windows.
For more information: