I have Node_exporter as service and cadvisor as a container.
I can see the targets in Prometheus UI however which metric would provide details of OOM kill of a conatiner where service is hosted?
Node exporter does not collect metrics for containers.
If the node is running docker, then you need the docker exporter.
If your container is running in a Kubernetes pod, then you need kube-state-metrics to provide this information.