Fix Alloy profiling config: remove invalid targets_only, add required labels

pyroscope.ebpf requires __container_id__ and service_name labels on
targets. Added relabel rules to map from Kubernetes pod metadata.
Removed targets_only which doesn't exist as an argument.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

argocd/manifests/alloy-profiling-ringtail/config.alloy

@@ -10,6 +10,19 @@ discovery.kubernetes "pods" {
 discovery.relabel "pods" {
   targets = discovery.kubernetes.pods.targets
 
+  // Map container ID for pyroscope.ebpf (required label)
+  rule {
+    source_labels = ["__meta_kubernetes_pod_container_id"]
+    target_label  = "__container_id__"
+  }
+
+  // Build service_name from namespace/pod (required label)
+  rule {
+    source_labels = ["__meta_kubernetes_namespace", "__meta_kubernetes_pod_name"]
+    separator     = "/"
+    target_label  = "service_name"
+  }
+
   // Keep namespace label
   rule {
     source_labels = ["__meta_kubernetes_namespace"]
@@ -46,10 +59,9 @@ discovery.relabel "pods" {
 // ============== eBPF PROFILING ==============
 
 pyroscope.ebpf "instance" {
-  forward_to     = [pyroscope.write.endpoint.receiver]
-  targets_only   = true
-  targets        = discovery.relabel.pods.output
-  demangle       = "none"
+  forward_to = [pyroscope.write.endpoint.receiver]
+  targets    = discovery.relabel.pods.output
+  demangle   = "none"
 }
 
 // ============== PYROSCOPE WRITE ==============