Hi,
I reviewed the steps in that link you provided but we did not make our changes from the CLI. We made use of the VCenter GUI to add the IP address of the splunk server to the list of syslog destinations. When we tried it with the hostname as mentioned in the post, it did not resolve. I believe we did a restart of the ESX server as well.
In addition, is there something blocking the ESX server data from reaching the Splunk server? Any firewall in the way? Are you able to confirm that the ESX server can syslog to another location to make sure that is working in general?
Regarding your VMware app question. We do not make much use of the app itself to report on our VM data. We have developed our own dashboards and summary indexes from the data coming in from the DCNs and syslog.
Hope this helps.
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