[Feature]: otelgrpc: use hostname instead of the IP resolved from it for `server.address`

[cyrille-leclerc]

Component

Instrumentation: otelgrpc

Problem Statement

We observe in the OTel Demo traces, screenshot below, that otelgrpc sets server.address to the IP address (e.g. 172.18.0.19) rather than the hostname provided to the gRPC client (e.g. payment).

This makes troubleshooting harder and seems misaligned with the OTel semantic conventions, which state that server.address should use the server domain name when available (without reverse DNS), falling back to the IP otherwise (see reference).

Proposed Solution

Use the hostname provided in the gRPC client configuration instead of the IP address resolved from that hostname.

Alternatives

No response

Prior Art

No response

Additional Context

No response

[dmathieu]

cc @dashpole as code owner.

[dashpole]

I briefly looked into this. Similar to #8781 (comment), we would need an interceptor to add this information to the context.