App and Add-on for cassandra cluster monitoring: Why are cassandra logs not generated or forwarded?

HI, I am trying to configure the App for cassandra cluster monitoring and Add-on for cassandra cluster monitoring to monitor cassandra cluster. I have universal forwarder on each node. I have installed Add-on for cassandra cluster monitoring on universal forwarder. I get following log in splunkd.log 01-16-2017 13:58:15.883 +0000 INFO ExecProcessor - New scheduled exec process: /opt/splunkforwarder/etc/apps/Splunk_TA_cassandra/bin/cache.pl 01-16-2017 13:58:15.883 +0000 INFO ExecProcessor - interval: 60000 ms 01-16-2017 13:58:15.883 +0000 INFO ExecProcessor - New scheduled exec process: /opt/splunkforwarder/etc/apps/Splunk_TA_cassandra/bin/compactionhistory.pl 01-16-2017 13:58:15.883 +0000 INFO ExecProcessor - interval: 60000 ms 01-16-2017 13:58:15.883 +0000 INFO ExecProcessor - New scheduled exec process: /opt/splunkforwarder/etc/apps/Splunk_TA_cassandra/bin/cpu_perf.pl 01-16-2017 13:58:15.883 +0000 INFO ExecProcessor - interval: 60000 ms 01-16-2017 13:58:15.883 +0000 INFO ExecProcessor - New scheduled exec process: /opt/splunkforwarder/etc/apps/Splunk_TA_cassandra/bin/mem_perf.pl 01-16-2017 13:58:15.883 +0000 INFO ExecProcessor - interval: 60000 ms 01-16-2017 13:58:15.883 +0000 INFO ExecProcessor - New scheduled exec process: /opt/splunkforwarder/etc/apps/Splunk_TA_cassandra/bin/netstats.pl 01-16-2017 13:58:15.883 +0000 INFO ExecProcessor - interval: 60000 ms 01-16-2017 13:58:15.883 +0000 INFO ExecProcessor - New scheduled exec process: /opt/splunkforwarder/etc/apps/Splunk_TA_cassandra/bin/process.pl 01-16-2017 13:58:15.883 +0000 INFO ExecProcessor - interval: 60000 ms 01-16-2017 13:58:15.883 +0000 INFO ExecProcessor - New scheduled exec process: /opt/splunkforwarder/etc/apps/Splunk_TA_cassandra/bin/readwrite.pl 01-16-2017 13:58:15.883 +0000 INFO ExecProcessor - interval: 60000 ms 01-16-2017 13:58:15.883 +0000 INFO ExecProcessor - New scheduled exec process: /opt/splunkforwarder/etc/apps/Splunk_TA_cassandra/bin/status.pl 01-16-2017 13:58:15.883 +0000 INFO ExecProcessor - interval: 60000 ms I don't know if its issue with the forwarder which is not sending data to server or if the server is not receiving it. I think server is receiving other data fine when I search for host=<> index=_internal I do get results but I don't see any of Cassandra source / sourcetype Is the Add-on for cassandra cluster monitoring working? where does it write logs? in Perl script, i just see print(). does this mean its only STDOUT? how do i check where is the issue? in forwarder or at receiver?