Observability Analysis Language(OAL) Tool is a code generation tool for SkyWalking. This tool starts at SkyWalking v6, which provides the customization feature in aggregation.
If you want to know more about OAL, please see SkyWalking 6 official documents.
Some of SkyWalking v6 codes are generated by this tool. In the future, we hope we could integrate this tool into the main repo.