Add Environment Variable for OTLP Service Name

[KevinDuffy94]

Feature request

Currently the Service Name for OTLP is hard-coded as "text-generation-inference.server"
Could an environment variable be added which could set this. Something like...

resource = Resource.create( attributes={"service.name": os.getenv("OTLP_SERVICE_NAME","text-embeddings-inference.server")} )

And similar in the main.rs file in the router.

Motivation

Currently I have multiple models deployed and will be collected into a single APM so this will be problematic.

Your contribution

Unconfident in writing any rust code.

[LysandreJik]

WDYT @OlivierDehaene? Are you open for this addition?

[LysandreJik]

Seen with Olivier, sounds good! Would you like to open a PR similarly to huggingface/text-embeddings-inference#285?

[github-actions]

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