opentelemetry breaking changes

0.33.0

15 breaking changes, first published September 18, 2026.

• Removed experimental-grpc-retry
  Remove the experimental-grpc-retry and experimental-http-retry flags from Cargo.toml. github.com
• Removed HttpClient.send
  Use HttpClient::send_bytes instead of the removed send method. github.com
• Removed opentelemetry_otlp.retry
  Replace opentelemetry_otlp::retry imports with opentelemetry_otlp::RetryPolicy and use its with_* methods instead of struct literals. github.com
• Removed opentelemetry-jaeger-propagator
  The deprecated opentelemetry-jaeger-propagator crate is gone; use W3C TraceContext propagation instead. github.com
• Removed Protocol.from_env
  Builders now resolve OTEL_EXPORTER_OTLP_PROTOCOL automatically; read the env var directly if needed. github.com
• Removed reqwest-rustls-webpki-roots
  Use the reqwest-rustls feature instead. github.com
• Renamed without_scope_info
  The option is replaced by scope_info_enabled with inverted meaning; scope labels are now enabled by default. github.com
• Behavior changed opentelemetry-http
  Built-in reqwest and hyper clients return 4xx/5xx responses instead of transport errors, and limit response body reads to 4 MiB. github.com
• Behavior changed OTEL_EXPORTER_OTLP_INSECURE
  Endpoints without a scheme now use https; set OTEL_EXPORTER_OTLP_INSECURE=true for plaintext connections. github.com
• Behavior changed TraceState
  from_str, from_key_value and insert now drop excess list members from the end. github.com

And 5 more in this version.

Check your code

These are the changes. To see which of them reach your code, scan a public repository, or have your coding agent call check_code with your manifest or lockfile over MCP. The API reads every change in every version, not only the newest. On Team and up, a fix pull request opens for the changes that reach a connected repository. Nothing merges or deploys.