Protobuf files

The .proto files in this directory and its subdirectories are used to generate Java source files during the Maven build process.

OpenTelemetry

We maintain a copy of the protobuf specs from the OpenTelemetry Protocol (OTLP) Specification repository.

These are required as dependencies for the otel-raw-journal-record.proto spec.

OpAMP

We also maintain a copy of the protobuf specs from the OpAMP Specification repository.

These are used for the OpAMP-based sidecar communication.

Updating the specs

To update the proto specs, edit the version numbers at the top of the fetch_upstream_protos.sh script and then run it:

./fetch_upstream_protos.sh

The script will download the release archives and extract the .proto files into ./opentelemetry and ./opamp, maintaining the directory structure.

Note: The script requires GNU tar. On macOS, install it with brew install gnu-tar and run:

bashCopy

TAR_BIN=gtar ./fetch_upstream_protos.sh