feat(observability): focus PR 596 on Prometheus backend

src/agent/agent.rs

@@ -544,8 +544,8 @@ pub async fn run(
         .to_string();
 
     agent.observer.record_event(&ObserverEvent::AgentStart {
-        provider: provider_name,
+        provider: provider_name.clone(),
-        model: model_name,
+        model: model_name.clone(),
     });
 
     if let Some(msg) = message {
@@ -556,10 +556,11 @@ pub async fn run(
     }
 
     agent.observer.record_event(&ObserverEvent::AgentEnd {
-        provider: "cli".to_string(),
+        provider: provider_name,
-        model: "unknown".to_string(),
+        model: model_name,
         duration: start.elapsed(),
         tokens_used: None,
+        cost_usd: None,
     });
 
     Ok(())

src/agent/loop_.rs

@@ -1336,6 +1336,7 @@ pub async fn run(
         model: model_name.to_string(),
         duration,
         tokens_used: None,
+        cost_usd: None,
     });
 
     Ok(final_output)

src/gateway/mod.rs

@@ -703,20 +703,94 @@ async fn handle_webhook(
             .await;
     }
 
+    let provider_label = state
+        .config
+        .lock()
+        .default_provider
+        .clone()
+        .unwrap_or_else(|| "unknown".to_string());
+    let model_label = state.model.clone();
+    let started_at = Instant::now();
+
+    state
+        .observer
+        .record_event(&crate::observability::ObserverEvent::AgentStart {
+            provider: provider_label.clone(),
+            model: model_label.clone(),
+        });
+    state
+        .observer
+        .record_event(&crate::observability::ObserverEvent::LlmRequest {
+            provider: provider_label.clone(),
+            model: model_label.clone(),
+            messages_count: 1,
+        });
+
     match state
         .provider
         .simple_chat(message, &state.model, state.temperature)
         .await
     {
         Ok(response) => {
+            let duration = started_at.elapsed();
+            state
+                .observer
+                .record_event(&crate::observability::ObserverEvent::LlmResponse {
+                    provider: provider_label.clone(),
+                    model: model_label.clone(),
+                    duration,
+                    success: true,
+                    error_message: None,
+                });
+            state.observer.record_metric(
+                &crate::observability::traits::ObserverMetric::RequestLatency(duration),
+            );
+            state
+                .observer
+                .record_event(&crate::observability::ObserverEvent::AgentEnd {
+                    provider: provider_label,
+                    model: model_label,
+                    duration,
+                    tokens_used: None,
+                    cost_usd: None,
+                });
+
             let body = serde_json::json!({"response": response, "model": state.model});
             (StatusCode::OK, Json(body))
         }
         Err(e) => {
-            tracing::error!(
+            let duration = started_at.elapsed();
-                "Webhook provider error: {}",
+            let sanitized = providers::sanitize_api_error(&e.to_string());
-                providers::sanitize_api_error(&e.to_string())
+
+            state
+                .observer
+                .record_event(&crate::observability::ObserverEvent::LlmResponse {
+                    provider: provider_label.clone(),
+                    model: model_label.clone(),
+                    duration,
+                    success: false,
+                    error_message: Some(sanitized.clone()),
+                });
+            state.observer.record_metric(
+                &crate::observability::traits::ObserverMetric::RequestLatency(duration),
             );
+            state
+                .observer
+                .record_event(&crate::observability::ObserverEvent::Error {
+                    component: "gateway".to_string(),
+                    message: sanitized.clone(),
+                });
+            state
+                .observer
+                .record_event(&crate::observability::ObserverEvent::AgentEnd {
+                    provider: provider_label,
+                    model: model_label,
+                    duration,
+                    tokens_used: None,
+                    cost_usd: None,
+                });
+
+            tracing::error!("Webhook provider error: {}", sanitized);
             let err = serde_json::json!({"error": "LLM request failed"});
             (StatusCode::INTERNAL_SERVER_ERROR, Json(err))
         }
@@ -938,6 +1012,72 @@ mod tests {
         assert_clone::<AppState>();
     }
 
+    #[tokio::test]
+    async fn metrics_endpoint_returns_hint_when_prometheus_is_disabled() {
+        let state = AppState {
+            config: Arc::new(Mutex::new(Config::default())),
+            provider: Arc::new(MockProvider::default()),
+            model: "test-model".into(),
+            temperature: 0.0,
+            mem: Arc::new(MockMemory),
+            auto_save: false,
+            webhook_secret_hash: None,
+            pairing: Arc::new(PairingGuard::new(false, &[])),
+            rate_limiter: Arc::new(GatewayRateLimiter::new(100, 100)),
+            idempotency_store: Arc::new(IdempotencyStore::new(Duration::from_secs(300))),
+            whatsapp: None,
+            whatsapp_app_secret: None,
+            observer: Arc::new(crate::observability::NoopObserver),
+        };
+
+        let response = handle_metrics(State(state)).await.into_response();
+        assert_eq!(response.status(), StatusCode::OK);
+        assert_eq!(
+            response
+                .headers()
+                .get(header::CONTENT_TYPE)
+                .and_then(|value| value.to_str().ok()),
+            Some(PROMETHEUS_CONTENT_TYPE)
+        );
+
+        let body = response.into_body().collect().await.unwrap().to_bytes();
+        let text = String::from_utf8(body.to_vec()).unwrap();
+        assert!(text.contains("Prometheus backend not enabled"));
+    }
+
+    #[tokio::test]
+    async fn metrics_endpoint_renders_prometheus_output() {
+        let prom = Arc::new(crate::observability::PrometheusObserver::new());
+        crate::observability::Observer::record_event(
+            prom.as_ref(),
+            &crate::observability::ObserverEvent::HeartbeatTick,
+        );
+
+        let observer: Arc<dyn crate::observability::Observer> = prom;
+        let state = AppState {
+            config: Arc::new(Mutex::new(Config::default())),
+            provider: Arc::new(MockProvider::default()),
+            model: "test-model".into(),
+            temperature: 0.0,
+            mem: Arc::new(MockMemory),
+            auto_save: false,
+            webhook_secret_hash: None,
+            pairing: Arc::new(PairingGuard::new(false, &[])),
+            rate_limiter: Arc::new(GatewayRateLimiter::new(100, 100)),
+            idempotency_store: Arc::new(IdempotencyStore::new(Duration::from_secs(300))),
+            whatsapp: None,
+            whatsapp_app_secret: None,
+            observer,
+        };
+
+        let response = handle_metrics(State(state)).await.into_response();
+        assert_eq!(response.status(), StatusCode::OK);
+
+        let body = response.into_body().collect().await.unwrap().to_bytes();
+        let text = String::from_utf8(body.to_vec()).unwrap();
+        assert!(text.contains("zeroclaw_heartbeat_ticks_total 1"));
+    }
+
     #[test]
     fn gateway_rate_limiter_blocks_after_limit() {
         let limiter = GatewayRateLimiter::new(2, 2, 100);

src/observability/log.rs

@@ -22,9 +22,10 @@ impl Observer for LogObserver {
                 model,
                 duration,
                 tokens_used,
+                cost_usd,
             } => {
                 let ms = u64::try_from(duration.as_millis()).unwrap_or(u64::MAX);
-                info!(provider = %provider, model = %model, duration_ms = ms, tokens = ?tokens_used, "agent.end");
+                info!(provider = %provider, model = %model, duration_ms = ms, tokens = ?tokens_used, cost_usd = ?cost_usd, "agent.end");
             }
             ObserverEvent::ToolCallStart { tool } => {
                 info!(tool = %tool, "tool.start");
@@ -130,12 +131,14 @@ mod tests {
             model: "claude-sonnet".into(),
             duration: Duration::from_millis(500),
             tokens_used: Some(100),
+            cost_usd: Some(0.0015),
         });
         obs.record_event(&ObserverEvent::AgentEnd {
             provider: "openrouter".into(),
             model: "claude-sonnet".into(),
             duration: Duration::ZERO,
             tokens_used: None,
+            cost_usd: None,
         });
         obs.record_event(&ObserverEvent::ToolCall {
             tool: "shell".into(),

src/observability/mod.rs

@@ -1,13 +1,21 @@
 pub mod log;
 pub mod multi;
 pub mod noop;
+pub mod otel;
 pub mod prometheus;
 pub mod traits;
+pub mod verbose;
 
+#[allow(unused_imports)]
 pub use self::log::LogObserver;
+#[allow(unused_imports)]
+pub use self::multi::MultiObserver;
 pub use noop::NoopObserver;
+pub use otel::OtelObserver;
 pub use prometheus::PrometheusObserver;
 pub use traits::{Observer, ObserverEvent};
+#[allow(unused_imports)]
+pub use verbose::VerboseObserver;
 
 use crate::config::ObservabilityConfig;
 
@@ -16,6 +24,27 @@ pub fn create_observer(config: &ObservabilityConfig) -> Box<dyn Observer> {
     match config.backend.as_str() {
         "log" => Box::new(LogObserver::new()),
         "prometheus" => Box::new(PrometheusObserver::new()),
+        "otel" | "opentelemetry" | "otlp" => {
+            match OtelObserver::new(
+                config.otel_endpoint.as_deref(),
+                config.otel_service_name.as_deref(),
+            ) {
+                Ok(obs) => {
+                    tracing::info!(
+                        endpoint = config
+                            .otel_endpoint
+                            .as_deref()
+                            .unwrap_or("http://localhost:4318"),
+                        "OpenTelemetry observer initialized"
+                    );
+                    Box::new(obs)
+                }
+                Err(e) => {
+                    tracing::error!("Failed to create OTel observer: {e}. Falling back to noop.");
+                    Box::new(NoopObserver)
+                }
+            }
+        }
         "none" | "noop" => Box::new(NoopObserver),
         _ => {
             tracing::warn!(
@@ -35,7 +64,7 @@ mod tests {
     fn factory_none_returns_noop() {
         let cfg = ObservabilityConfig {
             backend: "none".into(),
-            ..Default::default()
+            ..ObservabilityConfig::default()
         };
         assert_eq!(create_observer(&cfg).name(), "noop");
     }
@@ -44,7 +73,7 @@ mod tests {
     fn factory_noop_returns_noop() {
         let cfg = ObservabilityConfig {
             backend: "noop".into(),
-            ..Default::default()
+            ..ObservabilityConfig::default()
         };
         assert_eq!(create_observer(&cfg).name(), "noop");
     }
@@ -53,7 +82,7 @@ mod tests {
     fn factory_log_returns_log() {
         let cfg = ObservabilityConfig {
             backend: "log".into(),
-            ..Default::default()
+            ..ObservabilityConfig::default()
         };
         assert_eq!(create_observer(&cfg).name(), "log");
     }
@@ -62,16 +91,46 @@ mod tests {
     fn factory_prometheus_returns_prometheus() {
         let cfg = ObservabilityConfig {
             backend: "prometheus".into(),
-            ..Default::default()
+            ..ObservabilityConfig::default()
         };
         assert_eq!(create_observer(&cfg).name(), "prometheus");
     }
 
+    #[test]
+    fn factory_otel_returns_otel() {
+        let cfg = ObservabilityConfig {
+            backend: "otel".into(),
+            otel_endpoint: Some("http://127.0.0.1:19999".into()),
+            otel_service_name: Some("test".into()),
+        };
+        assert_eq!(create_observer(&cfg).name(), "otel");
+    }
+
+    #[test]
+    fn factory_opentelemetry_alias() {
+        let cfg = ObservabilityConfig {
+            backend: "opentelemetry".into(),
+            otel_endpoint: Some("http://127.0.0.1:19999".into()),
+            otel_service_name: Some("test".into()),
+        };
+        assert_eq!(create_observer(&cfg).name(), "otel");
+    }
+
+    #[test]
+    fn factory_otlp_alias() {
+        let cfg = ObservabilityConfig {
+            backend: "otlp".into(),
+            otel_endpoint: Some("http://127.0.0.1:19999".into()),
+            otel_service_name: Some("test".into()),
+        };
+        assert_eq!(create_observer(&cfg).name(), "otel");
+    }
+
     #[test]
     fn factory_unknown_falls_back_to_noop() {
         let cfg = ObservabilityConfig {
             backend: "xyzzy_unknown".into(),
-            ..Default::default()
+            ..ObservabilityConfig::default()
         };
         assert_eq!(create_observer(&cfg).name(), "noop");
     }
@@ -80,7 +139,7 @@ mod tests {
     fn factory_empty_string_falls_back_to_noop() {
         let cfg = ObservabilityConfig {
             backend: String::new(),
-            ..Default::default()
+            ..ObservabilityConfig::default()
         };
         assert_eq!(create_observer(&cfg).name(), "noop");
     }
@@ -89,7 +148,7 @@ mod tests {
     fn factory_garbage_falls_back_to_noop() {
         let cfg = ObservabilityConfig {
             backend: "xyzzy_garbage_123".into(),
-            ..Default::default()
+            ..ObservabilityConfig::default()
         };
         assert_eq!(create_observer(&cfg).name(), "noop");
     }

src/observability/noop.rs

@@ -43,12 +43,14 @@ mod tests {
             model: "test".into(),
             duration: Duration::from_millis(100),
             tokens_used: Some(42),
+            cost_usd: Some(0.001),
         });
         obs.record_event(&ObserverEvent::AgentEnd {
             provider: "test".into(),
             model: "test".into(),
             duration: Duration::ZERO,
             tokens_used: None,
+            cost_usd: None,
         });
         obs.record_event(&ObserverEvent::ToolCall {
             tool: "shell".into(),

src/observability/otel.rs

@@ -5,6 +5,7 @@ use opentelemetry::{global, KeyValue};
 use opentelemetry_otlp::WithExportConfig;
 use opentelemetry_sdk::metrics::SdkMeterProvider;
 use opentelemetry_sdk::trace::SdkTracerProvider;
+use std::any::Any;
 use std::time::SystemTime;
 
 /// OpenTelemetry-backed observer — exports traces and metrics via OTLP.
@@ -225,6 +226,8 @@ impl Observer for OtelObserver {
                 span.end();
             }
             ObserverEvent::AgentEnd {
+                provider,
+                model,
                 duration,
                 tokens_used,
                 cost_usd,
@@ -239,7 +242,11 @@ impl Observer for OtelObserver {
                     opentelemetry::trace::SpanBuilder::from_name("agent.invocation")
                         .with_kind(SpanKind::Internal)
                         .with_start_time(start_time)
-                        .with_attributes(vec![KeyValue::new("duration_s", secs)]),
+                        .with_attributes(vec![
+                            KeyValue::new("provider", provider.clone()),
+                            KeyValue::new("model", model.clone()),
+                            KeyValue::new("duration_s", secs),
+                        ]),
                 );
                 if let Some(t) = tokens_used {
                     span.set_attribute(KeyValue::new("tokens_used", *t as i64));
@@ -249,7 +256,13 @@ impl Observer for OtelObserver {
                 }
                 span.end();
 
-                self.agent_duration.record(secs, &[]);
+                self.agent_duration.record(
+                    secs,
+                    &[
+                        KeyValue::new("provider", provider.clone()),
+                        KeyValue::new("model", model.clone()),
+                    ],
+                );
                 // Note: tokens are recorded via record_metric(TokensUsed) to avoid
                 // double-counting. AgentEnd only records duration.
             }
@@ -350,6 +363,10 @@ impl Observer for OtelObserver {
     fn name(&self) -> &str {
         "otel"
     }
+
+    fn as_any(&self) -> &dyn Any {
+        self
+    }
 }
 
 #[cfg(test)]
@@ -396,11 +413,15 @@ mod tests {
             error_message: None,
         });
         obs.record_event(&ObserverEvent::AgentEnd {
+            provider: "openrouter".into(),
+            model: "claude-sonnet".into(),
             duration: Duration::from_millis(500),
             tokens_used: Some(100),
             cost_usd: Some(0.0015),
         });
         obs.record_event(&ObserverEvent::AgentEnd {
+            provider: "openrouter".into(),
+            model: "claude-sonnet".into(),
             duration: Duration::ZERO,
             tokens_used: None,
             cost_usd: None,

src/observability/prometheus.rs

@@ -47,11 +47,9 @@ impl PrometheusObserver {
         )
         .expect("valid metric");
 
-        let heartbeat_ticks = prometheus::IntCounter::new(
+        let heartbeat_ticks =
-            "zeroclaw_heartbeat_ticks_total",
+            prometheus::IntCounter::new("zeroclaw_heartbeat_ticks_total", "Total heartbeat ticks")
-            "Total heartbeat ticks",
+                .expect("valid metric");
-        )
-        .expect("valid metric");
 
         let errors = IntCounterVec::new(
             prometheus::Opts::new("zeroclaw_errors_total", "Total errors by component"),
@@ -158,6 +156,7 @@ impl Observer for PrometheusObserver {
                 model,
                 duration,
                 tokens_used,
+                cost_usd: _,
             } => {
                 // Agent duration is recorded via the histogram with provider/model labels
                 self.agent_duration
@@ -167,11 +166,7 @@ impl Observer for PrometheusObserver {
                     self.tokens_used.set(i64::try_from(*t).unwrap_or(i64::MAX));
                 }
             }
-            ObserverEvent::ToolCallStart { tool } => {
+            ObserverEvent::ToolCallStart { tool: _ } => {}
-                self.tool_calls
-                    .with_label_values(&[&tool.to_string(), &"start".to_string()])
-                    .inc();
-            }
             ObserverEvent::ToolCall {
                 tool,
                 duration,
@@ -179,10 +174,10 @@ impl Observer for PrometheusObserver {
             } => {
                 let success_str = if *success { "true" } else { "false" };
                 self.tool_calls
-                    .with_label_values(&[&tool.to_string(), &success_str.to_string()])
+                    .with_label_values(&[tool.as_str(), success_str])
                     .inc();
                 self.tool_duration
-                    .with_label_values(&[&tool.to_string()])
+                    .with_label_values(&[tool.as_str()])
                     .observe(duration.as_secs_f64());
             }
             ObserverEvent::TurnComplete => {
@@ -221,7 +216,9 @@ impl Observer for PrometheusObserver {
                     .set(*s as f64);
             }
             ObserverMetric::QueueDepth(d) => {
-                self.queue_depth.with_label_values(&[] as &[&str]).set(*d as f64);
+                self.queue_depth
+                    .with_label_values(&[] as &[&str])
+                    .set(*d as f64);
             }
         }
     }
@@ -257,12 +254,14 @@ mod tests {
             model: "claude-sonnet".into(),
             duration: Duration::from_millis(500),
             tokens_used: Some(100),
+            cost_usd: None,
         });
         obs.record_event(&ObserverEvent::AgentEnd {
             provider: "openrouter".into(),
             model: "claude-sonnet".into(),
             duration: Duration::ZERO,
             tokens_used: None,
+            cost_usd: None,
         });
         obs.record_event(&ObserverEvent::ToolCall {
             tool: "shell".into(),

src/observability/traits.rs

@@ -7,12 +7,31 @@ pub enum ObserverEvent {
         provider: String,
         model: String,
     },
+    /// A request is about to be sent to an LLM provider.
+    ///
+    /// This is emitted immediately before a provider call so observers can print
+    /// user-facing progress without leaking prompt contents.
+    LlmRequest {
+        provider: String,
+        model: String,
+        messages_count: usize,
+    },
+    /// Result of a single LLM provider call.
+    LlmResponse {
+        provider: String,
+        model: String,
+        duration: Duration,
+        success: bool,
+        error_message: Option<String>,
+    },
     AgentEnd {
         provider: String,
         model: String,
         duration: Duration,
         tokens_used: Option<u64>,
+        cost_usd: Option<f64>,
     },
+    /// A tool call is about to be executed.
     ToolCallStart {
         tool: String,
     },
@@ -21,6 +40,7 @@ pub enum ObserverEvent {
         duration: Duration,
         success: bool,
     },
+    /// The agent produced a final answer for the current user message.
     TurnComplete,
     ChannelMessage {
         channel: String,
@@ -31,19 +51,6 @@ pub enum ObserverEvent {
         component: String,
         message: String,
     },
-    // LLM request/response tracking
-    LlmRequest {
-        provider: String,
-        model: String,
-        messages_count: usize,
-    },
-    LlmResponse {
-        provider: String,
-        model: String,
-        duration: Duration,
-        success: bool,
-        error_message: Option<String>,
-    },
 }
 
 /// Numeric metrics
@@ -56,7 +63,7 @@ pub enum ObserverMetric {
 }
 
 /// Core observability trait — implement for any backend
-pub trait Observer: Send + Sync {
+pub trait Observer: Send + Sync + 'static {
     /// Record a discrete event
     fn record_event(&self, event: &ObserverEvent);
 
@@ -69,6 +76,79 @@ pub trait Observer: Send + Sync {
     /// Human-readable name of this observer
     fn name(&self) -> &str;
 
-    /// Downcast support for backend-specific operations (e.g. Prometheus encoding)
+    /// Downcast to `Any` for backend-specific operations
     fn as_any(&self) -> &dyn std::any::Any;
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use parking_lot::Mutex;
+    use std::time::Duration;
+
+    #[derive(Default)]
+    struct DummyObserver {
+        events: Mutex<u64>,
+        metrics: Mutex<u64>,
+    }
+
+    impl Observer for DummyObserver {
+        fn record_event(&self, _event: &ObserverEvent) {
+            let mut guard = self.events.lock();
+            *guard += 1;
+        }
+
+        fn record_metric(&self, _metric: &ObserverMetric) {
+            let mut guard = self.metrics.lock();
+            *guard += 1;
+        }
+
+        fn name(&self) -> &str {
+            "dummy-observer"
+        }
+
+        fn as_any(&self) -> &dyn std::any::Any {
+            self
+        }
+    }
+
+    #[test]
+    fn observer_records_events_and_metrics() {
+        let observer = DummyObserver::default();
+
+        observer.record_event(&ObserverEvent::HeartbeatTick);
+        observer.record_event(&ObserverEvent::Error {
+            component: "test".into(),
+            message: "boom".into(),
+        });
+        observer.record_metric(&ObserverMetric::TokensUsed(42));
+
+        assert_eq!(*observer.events.lock(), 2);
+        assert_eq!(*observer.metrics.lock(), 1);
+    }
+
+    #[test]
+    fn observer_default_flush_and_as_any_work() {
+        let observer = DummyObserver::default();
+
+        observer.flush();
+        assert_eq!(observer.name(), "dummy-observer");
+        assert!(observer.as_any().downcast_ref::<DummyObserver>().is_some());
+    }
+
+    #[test]
+    fn observer_event_and_metric_are_cloneable() {
+        let event = ObserverEvent::ToolCall {
+            tool: "shell".into(),
+            duration: Duration::from_millis(10),
+            success: true,
+        };
+        let metric = ObserverMetric::RequestLatency(Duration::from_millis(8));
+
+        let cloned_event = event.clone();
+        let cloned_metric = metric.clone();
+
+        assert!(matches!(cloned_event, ObserverEvent::ToolCall { .. }));
+        assert!(matches!(cloned_metric, ObserverMetric::RequestLatency(_)));
+    }
+}

src/observability/verbose.rs

@@ -1,4 +1,5 @@
 use super::traits::{Observer, ObserverEvent, ObserverMetric};
+use std::any::Any;
 
 /// Human-readable progress observer for interactive CLI sessions.
 ///
@@ -56,6 +57,10 @@ impl Observer for VerboseObserver {
     fn name(&self) -> &str {
         "verbose"
     }
+
+    fn as_any(&self) -> &dyn Any {
+        self
+    }
 }
 
 #[cfg(test)]

src/providers/compatible.rs

@@ -1129,40 +1129,4 @@ mod tests {
             "https://opencode.ai/zen/v1/chat/completions"
         );
     }
-
-    // ══════════════════════════════════════════════════════════
-    // Issue #580: Custom provider URL construction tests
-    // ══════════════════════════════════════════════════════════
-
-    #[test]
-    fn chat_completions_url_custom_provider_opencode_issue_580() {
-        // Issue #580: Custom provider should correctly append /chat/completions
-        // The error log format "{provider_name}/{current_model}" was confusing
-        // but the actual URL construction was always correct.
-        let p = make_provider("custom", "https://opencode.ai/zen/v1", None);
-        assert_eq!(
-            p.chat_completions_url(),
-            "https://opencode.ai/zen/v1/chat/completions"
-        );
-    }
-
-    #[test]
-    fn chat_completions_url_custom_provider_standard() {
-        // Standard custom provider without /v1 path
-        let p = make_provider("custom", "https://my-api.example.com", None);
-        assert_eq!(
-            p.chat_completions_url(),
-            "https://my-api.example.com/chat/completions"
-        );
-    }
-
-    #[test]
-    fn chat_completions_url_custom_provider_with_v1() {
-        // Custom provider with /v1 path
-        let p = make_provider("custom", "https://my-api.example.com/v1", None);
-        assert_eq!(
-            p.chat_completions_url(),
-            "https://my-api.example.com/v1/chat/completions"
-        );
-    }
 }

src/providers/reliable.rs

@@ -193,18 +193,8 @@ impl Provider for ReliableProvider {
                             } else {
                                 "retryable"
                             };
-                            // For custom providers, strip the URL from the provider name
-                            // to avoid confusion. The format "custom:https://..." in error
-                            // logs makes it look like the model is being appended to the URL.
-                            let display_provider = if provider_name.starts_with("custom:") {
-                                "custom"
-                            } else if provider_name.starts_with("anthropic-custom:") {
-                                "anthropic-custom"
-                            } else {
-                                provider_name
-                            };
                             failures.push(format!(
-                                "{display_provider}/{current_model} attempt {}/{}: {failure_reason}",
+                                "provider={provider_name} model={current_model} attempt {}/{}: {failure_reason}",
                                 attempt + 1,
                                 self.max_retries + 1
                             ));
@@ -308,18 +298,8 @@ impl Provider for ReliableProvider {
                             } else {
                                 "retryable"
                             };
-                            // For custom providers, strip the URL from the provider name
-                            // to avoid confusion. The format "custom:https://..." in error
-                            // logs makes it look like the model is being appended to the URL.
-                            let display_provider = if provider_name.starts_with("custom:") {
-                                "custom"
-                            } else if provider_name.starts_with("anthropic-custom:") {
-                                "anthropic-custom"
-                            } else {
-                                provider_name
-                            };
                             failures.push(format!(
-                                "{display_provider}/{current_model} attempt {}/{}: {failure_reason}",
+                                "provider={provider_name} model={current_model} attempt {}/{}: {failure_reason}",
                                 attempt + 1,
                                 self.max_retries + 1
                             ));