As documented in Specs - https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/protocol/exporter.md#opentelemetry-protocol-exporter

Compression: Compression key for supported compression types. Supported compression: gzip.

Default: No value [2]
Env vars: OTEL_EXPORTER_OTLP_COMPRESSION OTEL_EXPORTER_OTLP_TRACES_COMPRESSION OTEL_EXPORTER_OTLP_METRICS_COMPRESSION OTEL_EXPORTER_OTLP_LOGS_COMPRESSION

High level changes for OTLP HTTP Exporter:

• Add compression option (gzip/none) in OtlpHttpExporterOptions, OtlpHttpLogRecordExporterOptions, OtlpHttpMetricExporterOptions. Default is none.
• Modify ext::http::client::curl to
  • If compression option is enabled,
    • Make a HEAD request to server to validate if gzip encoding is accepted. ( ? )
      - If accepted, compress the data using zlib, and set Content-Encoding: gzip header.
      - If not accepted, send uncompressed data and log a warning
  • If compression option is not enabled,
    • send uncompressed data to server as done now.

High level changes for OTLP gRPC Exporter:

• Add compression option (gzip/none) in OtlpGrpcExporterOptions. Default is none.
• Modify OtlpGrpcClient::MakeChannel to set the compression algorithm for the channel if enabled. Refer gRPC compression example here - https://github.com/grpc/grpc/blob/master/examples/cpp/compression/README.md#writing-a-client-and-a-server.