add K8s resoure attributes to apm services (#49)

Author: rogercoll

kubernetes/elastic-helm/configmap-daemonset.yaml

@@ -37,7 +37,7 @@ data:
       resourcedetection/gcp:
         detectors: [env, gcp]
         timeout: 2s
-        override: false
+        override: true
       resource/k8s:
         attributes:
           - key: service.name

kubernetes/elastic-helm/deployment.yaml

@@ -2,6 +2,35 @@ default:
   image:
     repository: ghcr.io/elastic/opentelemetry-demo
     tag: 1.11.2
+  envOverrides:
+    - name: OTEL_SERVICE_NAME
+      valueFrom:
+        fieldRef:
+          apiVersion: v1
+          fieldPath: metadata.labels['app.kubernetes.io/component']
+    - name: OTEL_K8S_NAMESPACE
+      valueFrom:
+        fieldRef:
+         apiVersion: v1
+         fieldPath: metadata.namespace
+    - name: OTEL_K8S_NODE_NAME
+      valueFrom:
+        fieldRef:
+          apiVersion: v1
+          fieldPath: spec.nodeName
+    - name: OTEL_K8S_POD_NAME
+      valueFrom:
+        fieldRef:
+          apiVersion: v1
+          fieldPath: metadata.name
+    - name: OTEL_K8S_POD_UID
+      valueFrom:
+        fieldRef:
+          apiVersion: v1
+          fieldPath: metadata.uid
+    - name: OTEL_RESOURCE_ATTRIBUTES
+      value: 'service.name=$(OTEL_SERVICE_NAME),service.instance.id=$(OTEL_K8S_POD_UID),service.namespace=opentelemetry-demo,k8s.namespace.name=$(OTEL_K8S_NAMESPACE),k8s.node.name=$(OTEL_K8S_NODE_NAME),k8s.pod.name=$(OTEL_K8S_POD_NAME)'
+
 
 opentelemetry-collector:
   image: