Updated a new section with "Optional" config

processor/k8sattributesprocessor/doc.go

@@ -150,6 +150,17 @@
 //            fieldRef:
 //             apiVersion: v1
 //              fieldPath: spec.nodeName
+//
+// This will inject a new environment variable to the OpenTelemetry container with the value as the
+// name of the node the pod was scheduled to run on.
+
+// 2. ( Optional in case the filereciever does not have k8s.pod.uid available in filepath ) Use the downward API to inject the podIP in the instrumented pod inside spec.containers.env to capture status.podIP 
+//    and add it as part of the OTEL_RESOURCE_ATTRIBUTES env variable. After this is set it is used by the OpenTelemetry Collector's
+//    resourcedetection and k8sattributes processors to tag k8s metadata. 
+//    Add the following snippet under the pod env section of instrumented pod
+//    spec:
+//      containers:
+//      - env:
 //        - name: POD_IP
 //          valueFrom:
 //            fieldRef:
@@ -158,10 +169,7 @@
 //        - name: OTEL_RESOURCE_ATTRIBUTES
 //          value: k8s.pod.ip=$(POD_IP)
 //
-// This will inject a new environment variable to the OpenTelemetry container with the value as the
-// name of the node the pod was scheduled to run on.
-//
-// 2. Set "filter.node_from_env_var" to the name of the environment variable holding the node name.
+// 3. Set "filter.node_from_env_var" to the name of the environment variable holding the node name.
 //
 //    k8sattributes:
 //      filter: