feat: exclude fleet key

Author: Marc-AnthonyG

crates/burn-central-fleet/src/telemetry/inference.rs

@@ -55,7 +55,6 @@ pub fn record_request(data: RequestTelemetry) {
         "inference_name" => data.inference_name.clone(),
         "model_name" => data.model_name.clone(),
         "model_version" => data.model_version.clone(),
-        "fleet_key" => data.fleet_key.clone(),
         "cancelled" => cancelled.clone(),
     )
     .increment(1);
@@ -65,7 +64,6 @@ pub fn record_request(data: RequestTelemetry) {
         "inference_name" => data.inference_name.clone(),
         "model_name" => data.model_name.clone(),
         "model_version" => data.model_version.clone(),
-        "fleet_key" => data.fleet_key.clone(),
     )
     .increment(data.outputs as u64);
 
@@ -74,7 +72,6 @@ pub fn record_request(data: RequestTelemetry) {
         "inference_name" => data.inference_name.clone(),
         "model_name" => data.model_name.clone(),
         "model_version" => data.model_version.clone(),
-        "fleet_key" => data.fleet_key.clone(),
     )
     .increment(data.errors as u64);
 
@@ -83,7 +80,6 @@ pub fn record_request(data: RequestTelemetry) {
         "inference_name" => data.inference_name.clone(),
         "model_name" => data.model_name.clone(),
         "model_version" => data.model_version.clone(),
-        "fleet_key" => data.fleet_key.clone(),
         "cancelled" => cancelled,
     )
     .record(duration_ms);

crates/burn-central-fleet/src/telemetry/mod.rs

@@ -72,11 +72,23 @@ where
     metrics_tracing_context::MetricsLayer::new()
 }
 
+/// Label filter that excludes internal fleet metadata fields from being promoted to metric labels.
+/// Users can still add their own span fields and they will be included as metric labels.
+#[derive(Clone)]
+struct FleetLabelFilter;
+
+impl metrics_tracing_context::LabelFilter for FleetLabelFilter {
+    fn should_include_label(&self, _name: &::metrics::KeyName, label: &::metrics::Label) -> bool {
+        !matches!(label.key(), "fleet_key")
+    }
+}
+
 /// Creates a metrics recorder that inherits tracing context from the current span.
 /// Required for metrics to inherit tracing labels.
 pub fn metrics_recorder() -> impl ::metrics::Recorder {
     let global_recorder = GLOBAL_RECORDER.get_or_init(InMemoryMetricsRecorder::new);
-    metrics_tracing_context::TracingContextLayer::all().layer(global_recorder.clone())
+    metrics_tracing_context::TracingContextLayer::new(FleetLabelFilter)
+        .layer(global_recorder.clone())
 }
 
 /// Creates a tracing layer that captures tracing events into fleet telemetry logs.