Clarity on pricing change tracking

I am trying to figure out if we will be billed or not for enabling change tracking in Azure Arc.  In both Azure arc and in Azure Automation, under change tracking, it states:

"This service is included with Azure virtual machines and Azure Arc machines. You only pay for logs stored in Log Analytics."

On the Azure automation price page it states change tracking falls under Configuration management and will be billed  at $7.6053/month/node:

"Configuration management includes the configuration pull service and change tracking capabilities. Billing is based on the number of nodes that are registered with the service and the log data stored in the Azure Log Analytics service."

So which is it?  would love to collect this info (and just pay for the LA ingestion) but not $7.60/month per node.

Last question.  assuming it is free, does anyone have a ballpark or approx range of per node data collection rate for change tracking...i understand that this will vary depending on the server...just wondering if we will see a significant increase in LA costs.