Consider adding `messaging_latest_experimental` as a possible stabilitly opt-in value

[pichlermarc]

Area(s)

area:messaging

What's missing?

In the OTel JS Contrib repo, we have a bunch of instrumentations that are using very outdated versions of semantic conventions. Every once in a while, motivated contributors come around that are interested in updating these instrumentation to the latest experimental semantic conventions (example: open-telemetry/opentelemetry-js-contrib#2976).

Unfortunately, we don't have a "safe" way forward for such changes at the moment as the messaging semconv only specifies messaging and messaging/dup as possible values to be used once the messaging semantic conventions become stable.

Describe the solution you'd like

In the Gen AI Semantic Conventions' section about stability opt-in there's a gen_ai_latest_experimental value that can be set in OTEL_SEMCONV_STABILITY_OPT_IN. Having something like this for messaging (say messaging_latest_experimental) would

• give us a way forward to update outdated instrumentations to the latest Semantic Conventions without immediately breaking users that rely on the old behavior
• help clearly communicate that breaking changes are expected when this value is set, helping with future updates until the messaging semantic conventions are stable.

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