otelhttp still uses old semconv, resulting in exemplar label name "net.host.name" is invalid errors

[xsteadfastx]

Description

the otelhttp tracer throws me some errors in production code. i dont know if its just warnings or errors. but on tracing i get this

Dez 04 09:24:47 templeton hemingway[695]: 2024/12/04 09:24:47 exemplar label name "net.protocol.version" is invalid
Dez 04 09:24:47 templeton hemingway[695]: 2024/12/04 09:24:47 exemplar label name "net.protocol.version" is invalid
Dez 04 09:24:47 templeton hemingway[695]: 2024/12/04 09:24:47 exemplar label name "net.protocol.name" is invalid

i checked the code and saw that it semconvutil still depends on semconv version 1.20.0 which has net.protocol.version and so on as keys.

Environment

• OS: linux
• Architecture: amd64
• Go Version: 1.23.3
• go.opentelemetry.io/contrib version: v0.57.0

Expected behavior

using valid label names.

[dmathieu]

There are breaking changes between those semconv versions. So we can't just update them.
See this migration plan: #5132

Right now, setting the OTEL_SEMCONV_STABILITY_OPT_IN environment variable with a value of http/dup will duplicate the attributes so they match both semantic conventions.
Right now, if you don't specify this config, we still emit the 1.20.0 attributes. In the near future, the default behavior will change, and the default attributes will be on 1.26.0.

Closing this issue, as it's a migration we're already tracking.

[xsteadfastx]

ok thanks for the info. added the env variable. i still get the

Dez 04 14:57:27 templeton hemingway[697]: 2024/12/04 14:57:27 exemplar label name "http.scheme" is invalid
Dez 04 14:57:27 templeton hemingway[697]: 2024/12/04 14:57:27 exemplar label name "net.host.name" is invalid
Dez 04 14:57:27 templeton hemingway[697]: 2024/12/04 14:57:27 exemplar label name "net.protocol.version" is invalid

this still should apperar right? because labels get duplicated.

[dmathieu]

Yes, this should still appear because the attributes are duplicated.

[xsteadfastx]

thanks alot for your informations :)