[FEATURE REQ] Expand character limit on UserAgentApplicationId

[posaninagendra]

Describe the feature or improvement you are requesting

Today UserAgentApplicationId imposes a strict character limit of 24 characters, this limits the ability for our service to send client sent user agents appended to the service's own user agent and this in turn limits the ability to properly categorize token consumption at Azure OpenAI inferencing logs.

Having no character limit would be great or a big buffer for Azure services will unblock.

Character Limit Validation: https://github.com/openai/openai-dotnet/blob/main/src/Custom/Internal/TelemetryDetails.cs#L41

Additional context

No response

[KrzysztofCwalina]

@JeffreyRichter, do you remember why we have this limit?

[trrwilson]

Just as a reference point -- although the logic is copied to be project-local here, it's mirrored from the established behavior in Azure.Core:
https://github.com/Azure/azure-sdk-for-net/blob/81a4260b877f9739ab1d5b86757a0b38c11ae4ef/sdk/core/Azure.Core/src/TelemetryDetails.cs#L18

24 characters does seem to be excessively constrained to me.

[KrzysztofCwalina]

Yeah, it seems short, but it was picked like that for a reason (which I forgot). I vaguely remember that before we introduced this limit some servers/proxies were truncating the header. Jeff would remember.