[bug][otel]: OpenTelemetry gRPC exporter sends unencrypted data to HTTPS endpoint

What version of Codex is running?

0.53.0

What subscription do you have?

Business

Which model were you using?

gpt-5-codex

What platform is your computer?

_No response_

What issue are you seeing?

Regarding OpenTelemetry export, I observed plain HTTP traffic being sent to my gRPC OpenTelemetry endpoint (using Wireshark), even though my endpoint url explicitly mentions https.

This is related to https://github.com/open-telemetry/opentelemetry-rust/issues/3182.

What steps can reproduce the bug?

1. Set up a gRPC HTTPS endpoint in config.toml https://developers.openai.com/codex/security/#enable-otel-optin
2. Run the Codex CLI
3. Observe unecrypted outgoing traffic in Wireshark

What is the expected behavior?

_No response_

Additional information

_No response_