oss/core contains the lower-level shared crates shared across:

• InfluxDB 3 Core
• InfluxDB 3 Enterprise
• InfluxDB 3 IOx

These crates provide common building blocks such as query execution, schema and data types, HTTP and gRPC utilities, observability helpers, and supporting Arrow and Parquet infrastructure.

Examples of crates in this directory include:

• query and planner crates such as iox_query, iox_query_influxql, and query_functions
• shared data model crates such as data_types, schema, and mutable_batch
• service and protocol crates such as generated_types, service_grpc_flight, and iox_http
• common runtime and observability crates such as executor, metric, trace, and trogging

As a rule of thumb, code belongs in core when it is product-agnostic infrastructure.