feat(agent): record tool/turn/provider metrics

src/agent/agent_loop.rs

@@ -491,16 +491,41 @@ impl AgentLoop {
         iteration: u32,
         turn: Option<&AgentTurnContext>,
     ) -> Result<ChatCompletionResponse, AgentError> {
-        let mut provider_stream = self.provider.stream(request).await.map_err(|error| {
+        let metrics = crate::observability::metrics::global_metrics();
+        let provider_name = self.provider.name().to_string();
+        let provider_model = self.provider.model_id().to_string();
+        let start = Instant::now();
+
+        let mut provider_stream = match self.provider.stream(request).await {
+            Ok(stream) => stream,
+            Err(error) => {
                 tracing::error!(error = %error, "LLM request failed");
-            AgentError::LlmError(error.to_string())
+                metrics.record_provider(
-        })?;
+                    &provider_name,
+                    &provider_model,
+                    None,
+                    start.elapsed().as_millis() as u64,
+                    true,
+                );
+                return Err(AgentError::LlmError(error.to_string()));
+            }
+        };
         let mut accumulator = ProviderResponseAccumulator::default();
         while let Some(chunk) = provider_stream.next().await {
-            let chunk = chunk.map_err(|error| {
+            let chunk = match chunk {
+                Ok(chunk) => chunk,
+                Err(error) => {
                     tracing::error!(error = %error, "LLM stream failed");
-                AgentError::LlmError(error.to_string())
+                    metrics.record_provider(
-            })?;
+                        &provider_name,
+                        &provider_model,
+                        None,
+                        start.elapsed().as_millis() as u64,
+                        true,
+                    );
+                    return Err(AgentError::LlmError(error.to_string()));
+                }
+            };
             if let Some(turn) = turn {
                 let event = match &chunk {
                     ProviderChunk::Reasoning(delta) => Some(TurnEvent::ReasoningDelta {
@@ -521,7 +546,11 @@ impl AgentLoop {
             }
             accumulator.push(chunk);
         }
-        Ok(accumulator.finish())
+        let response = accumulator.finish();
+        let latency_ms = start.elapsed().as_millis() as u64;
+        metrics.record_provider(&provider_name, &provider_model, None, latency_ms, false);
+        metrics.record_provider_tokens(&provider_name, &response.usage);
+        Ok(response)
     }
 
     fn annotate_message(
@@ -615,6 +644,8 @@ impl AgentLoop {
         mut messages: Vec<ChatMessage>,
         turn: Option<AgentTurnContext>,
     ) -> Result<AgentProcessResult, AgentError> {
+        let turn_start = Instant::now();
+
         #[cfg(debug_assertions)]
         tracing::debug!(
             history_len = messages.len(),
@@ -703,6 +734,10 @@ impl AgentLoop {
                 assistant_message.provider_state = response.provider_state;
                 Self::annotate_message(&mut assistant_message, turn.as_ref(), iteration, true);
                 emitted_messages.push(assistant_message.clone());
+                crate::observability::metrics::global_metrics().record_turn(
+                    Some(&accumulated_usage),
+                    turn_start.elapsed().as_millis() as u64,
+                );
                 return Ok(AgentProcessResult {
                     final_response: assistant_message,
                     emitted_messages,
@@ -844,6 +879,10 @@ impl AgentLoop {
                     true,
                 );
                 emitted_messages.push(assistant_message.clone());
+                crate::observability::metrics::global_metrics().record_turn(
+                    Some(&accumulated_usage),
+                    turn_start.elapsed().as_millis() as u64,
+                );
                 Ok(AgentProcessResult {
                     final_response: assistant_message,
                     emitted_messages,
@@ -876,6 +915,11 @@ impl AgentLoop {
                 let mut final_message = ChatMessage::assistant(fallback);
                 Self::annotate_message(&mut final_message, turn.as_ref(), summary_iteration, true);
                 emitted_messages.push(final_message.clone());
+                let turn_usage = (accumulated_usage.total_tokens > 0).then_some(&accumulated_usage);
+                crate::observability::metrics::global_metrics().record_turn(
+                    turn_usage,
+                    turn_start.elapsed().as_millis() as u64,
+                );
                 Ok(AgentProcessResult {
                     final_response: final_message,
                     emitted_messages,
@@ -1016,6 +1060,9 @@ impl AgentLoop {
             });
         }
 
+        crate::observability::metrics::global_metrics()
+            .record_tool_call(&tool_name, result.success);
+
         // Apply duration
         Ok(ToolExecutionOutcome { duration, ..result })
     }