Source: https://github.com/open-telemetry/opentelemetry-collector-contrib/blob/main/exporter/fileexporter/README.md 

Functionality

The file exporter supports writing pipeline data to a file, rotation of telemetry files, compression of telemetry data before exporting and writing into multiple files. (See use cases in the comments)

Scope

Tech preview with tests and documentation. Note that some parts are alpha, so we might need to mention that some parts may change without much time to adapt.