Shotgun is a tool that could be used to gather files and commands output from a set of nodes in a data driven manner. Shotgun also allows to use custom APIs to get data. These data then can be used to analyze issues (a.k.a. diagnostic snapshot). Shotgun can be used either as a library or a CLI tool. It provides a set of drivers like `command`, `file`, `postgres`, etc. to deal with various data sources.