About using collectd
The collectd agent is an open source daemon that collects system and application performance metrics. Splunk's e-book gives you a deep dive into what collectd is, how you can configure collectd, analyze collectd data, and using Splunk and collectd together to analyze infrastructure data. See A Beginner's Guide to collectd on www.splunk.com.
Manually configure metrics collection on a *nix host for Splunk App for Infrastructure
collectd package sources, install commands, and locations
This documentation applies to the following versions of Splunk® App for Infrastructure: 2.2.0 Cloud only, 2.2.1, 2.2.3 Cloud only, 2.2.4