write_splunk is an extension to the write_http plugin. It does some metrics reformatting for common plugins like disk and cpu to set certain portions of the name such as volume or CPU as dimensions. It also pulls information about the host from the OS to add as dimensions as well.
write_splunk is the recommended plugin to use for collectd as it allows for the addition of custom dimensions and in the most recent versions the ability to send to a UF before sending to splunk. It is also the plugin required to use data with SAI.
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