agent2: Port feedback (#36603)

Release Notes:

- N/A

---------

Co-authored-by: Ben Brandt <benjamin.j.brandt@gmail.com>

crates/acp_thread/src/connection.rs

@@ -64,6 +64,10 @@ pub trait AgentConnection {
         None
     }
 
+    fn telemetry(&self) -> Option<Rc<dyn AgentTelemetry>> {
+        None
+    }
+
     fn into_any(self: Rc<Self>) -> Rc<dyn Any>;
 }
 
@@ -81,6 +85,19 @@ pub trait AgentSessionResume {
     fn run(&self, cx: &mut App) -> Task<Result<acp::PromptResponse>>;
 }
 
+pub trait AgentTelemetry {
+    /// The name of the agent used for telemetry.
+    fn agent_name(&self) -> String;
+
+    /// A representation of the current thread state that can be serialized for
+    /// storage with telemetry events.
+    fn thread_data(
+        &self,
+        session_id: &acp::SessionId,
+        cx: &mut App,
+    ) -> Task<Result<serde_json::Value>>;
+}
+
 #[derive(Debug)]
 pub struct AuthRequired {
     pub description: Option<String>,