more clean ups

Author: lmolkova

docs/gen-ai/gen-ai-agent-spans.md

@@ -369,6 +369,7 @@ and SHOULD be provided **at span creation time** (if provided at all):
 * [`gen_ai.operation.name`](/docs/registry/attributes/gen-ai.md)
 * [`gen_ai.provider.name`](/docs/registry/attributes/gen-ai.md)
 * [`server.address`](/docs/registry/attributes/server.md)
+* [`server.port`](/docs/registry/attributes/server.md)
 
 ---
 

model/gen-ai/spans.yaml

@@ -328,6 +328,8 @@ groups:
         requirement_level:
           recommended: when span kind is `CLIENT`.
         sampling_relevant: true
+      - ref: server.port
+        sampling_relevant: true
       - ref: gen_ai.system_instructions
         requirement_level: opt_in
       - ref: gen_ai.input.messages