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'yum deplist XXX' provides a list of packages that XXX depends on.
This command provides a list of packages that depend upon XXX (package reverse dependencies)
This probably only works without modifications in RHEL/CentOS/Fedora.
How to list just one repo with yum. First I disable all repo, second I enable just the repo that I want to list.
It displays, last 15 yum operations (in last operation as first row order) with its dates. Change 15 to any number of operations you need to display or remove "| tac" to see it in reverse order (last operation as last row)