This is a server utility mod for logging player interactions. This mod is currently available for the Forge modloader.
When installed, the following will be logged:
Interactions by forge's "Fake Players" are not logged.
This mod is configurable to filter logging via regex pattern; the default config file will be generated in yourminecraftinstance/config/ylssln-common.toml by forge the first time minecraft is launched with the mod installed. See the "Source" link above to view config format documentation in the project readme on github.