fix(infra): replace gitlab.com/prometheus annotations with prometheus.io

Prometheus was configured to scrape pods via prometheus.io/scrape
annotations, but all services and training jobs used gitlab.com/
prefix from legacy GitLab-managed Prometheus — causing Prometheus
to never discover any foxhunt pods. This resulted in stale/missing
metrics on the Grafana training dashboard.

12 files updated across services/, gpu-overlays/, training/, and
monitoring/ (node-exporter, dcgm-exporter cleanup).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

infra/k8s/gpu-overlays/ml-training-service-gpu.yaml

@@ -24,9 +24,9 @@ spec:
   template:
     metadata:
       annotations:
-        gitlab.com/prometheus_scrape: "true"
-        gitlab.com/prometheus_port: "9094"
-        gitlab.com/prometheus_path: "/metrics"
+        prometheus.io/scrape: "true"
+        prometheus.io/port: "9094"
+        prometheus.io/path: "/metrics"
       labels:
         app.kubernetes.io/name: ml-training-service
         app.kubernetes.io/part-of: foxhunt

infra/k8s/gpu-overlays/trading-service-gpu.yaml

@@ -24,9 +24,9 @@ spec:
   template:
     metadata:
       annotations:
-        gitlab.com/prometheus_scrape: "true"
-        gitlab.com/prometheus_port: "9092"
-        gitlab.com/prometheus_path: "/metrics"
+        prometheus.io/scrape: "true"
+        prometheus.io/port: "9092"
+        prometheus.io/path: "/metrics"
       labels:
         app.kubernetes.io/name: trading-service
         app.kubernetes.io/part-of: foxhunt

infra/k8s/monitoring/dcgm-exporter.yaml

@@ -51,9 +51,6 @@ spec:
         prometheus.io/scrape: "true"
         prometheus.io/port: "9400"
         prometheus.io/path: "/metrics"
-        gitlab.com/prometheus_scrape: "true"
-        gitlab.com/prometheus_port: "9400"
-        gitlab.com/prometheus_path: "/metrics"
     spec:
       # Only schedule on nodes that have GPUs
       affinity:
@@ -118,8 +115,6 @@ metadata:
   annotations:
     prometheus.io/scrape: "true"
     prometheus.io/port: "9400"
-    gitlab.com/prometheus_scrape: "true"
-    gitlab.com/prometheus_port: "9400"
 spec:
   type: ClusterIP
   selector:

infra/k8s/monitoring/node-exporter.yaml

@@ -30,9 +30,7 @@ spec:
       annotations:
         prometheus.io/scrape: "true"
         prometheus.io/port: "9100"
-        gitlab.com/prometheus_scrape: "true"
-        gitlab.com/prometheus_port: "9100"
-        gitlab.com/prometheus_path: "/metrics"
+        prometheus.io/path: "/metrics"
     spec:
       serviceAccountName: node-exporter
       hostPID: true

infra/k8s/services/api.yaml

@@ -19,9 +19,9 @@ spec:
   template:
     metadata:
       annotations:
-        gitlab.com/prometheus_scrape: "true"
-        gitlab.com/prometheus_port: "9091"
-        gitlab.com/prometheus_path: "/metrics"
+        prometheus.io/scrape: "true"
+        prometheus.io/port: "9091"
+        prometheus.io/path: "/metrics"
       labels:
         app.kubernetes.io/name: api
         app.kubernetes.io/part-of: foxhunt

infra/k8s/services/backtesting-service.yaml

@@ -19,9 +19,9 @@ spec:
   template:
     metadata:
       annotations:
-        gitlab.com/prometheus_scrape: "true"
-        gitlab.com/prometheus_port: "9093"
-        gitlab.com/prometheus_path: "/metrics"
+        prometheus.io/scrape: "true"
+        prometheus.io/port: "9093"
+        prometheus.io/path: "/metrics"
       labels:
         app.kubernetes.io/name: backtesting-service
         app.kubernetes.io/part-of: foxhunt

infra/k8s/services/broker-gateway.yaml

@@ -19,9 +19,9 @@ spec:
   template:
     metadata:
       annotations:
-        gitlab.com/prometheus_scrape: "true"
-        gitlab.com/prometheus_port: "9096"
-        gitlab.com/prometheus_path: "/metrics"
+        prometheus.io/scrape: "true"
+        prometheus.io/port: "9096"
+        prometheus.io/path: "/metrics"
       labels:
         app.kubernetes.io/name: broker-gateway
         app.kubernetes.io/part-of: foxhunt

infra/k8s/services/data-acquisition-service.yaml

@@ -19,9 +19,9 @@ spec:
   template:
     metadata:
       annotations:
-        gitlab.com/prometheus_scrape: "true"
-        gitlab.com/prometheus_port: "9097"
-        gitlab.com/prometheus_path: "/metrics"
+        prometheus.io/scrape: "true"
+        prometheus.io/port: "9097"
+        prometheus.io/path: "/metrics"
       labels:
         app.kubernetes.io/name: data-acquisition-service
         app.kubernetes.io/part-of: foxhunt

infra/k8s/services/ml-training-service.yaml

@@ -61,9 +61,9 @@ spec:
   template:
     metadata:
       annotations:
-        gitlab.com/prometheus_scrape: "true"
-        gitlab.com/prometheus_port: "9094"
-        gitlab.com/prometheus_path: "/metrics"
+        prometheus.io/scrape: "true"
+        prometheus.io/port: "9094"
+        prometheus.io/path: "/metrics"
       labels:
         app.kubernetes.io/name: ml-training-service
         app.kubernetes.io/part-of: foxhunt

infra/k8s/services/trading-agent-service.yaml

@@ -19,9 +19,9 @@ spec:
   template:
     metadata:
       annotations:
-        gitlab.com/prometheus_scrape: "true"
-        gitlab.com/prometheus_port: "9095"
-        gitlab.com/prometheus_path: "/metrics"
+        prometheus.io/scrape: "true"
+        prometheus.io/port: "9095"
+        prometheus.io/path: "/metrics"
       labels:
         app.kubernetes.io/name: trading-agent-service
         app.kubernetes.io/part-of: foxhunt

infra/k8s/services/trading-service.yaml

@@ -19,9 +19,9 @@ spec:
   template:
     metadata:
       annotations:
-        gitlab.com/prometheus_scrape: "true"
-        gitlab.com/prometheus_port: "9092"
-        gitlab.com/prometheus_path: "/metrics"
+        prometheus.io/scrape: "true"
+        prometheus.io/port: "9092"
+        prometheus.io/path: "/metrics"
       labels:
         app.kubernetes.io/name: trading-service
         app.kubernetes.io/part-of: foxhunt

infra/k8s/training/job-template.yaml

@@ -14,9 +14,9 @@ spec:
   template:
     metadata:
       annotations:
-        gitlab.com/prometheus_scrape: "true"
-        gitlab.com/prometheus_port: "9094"
-        gitlab.com/prometheus_path: "/metrics"
+        prometheus.io/scrape: "true"
+        prometheus.io/port: "9094"
+        prometheus.io/path: "/metrics"
       labels:
         app.kubernetes.io/name: training
         app.kubernetes.io/component: training-workflow