What do you mean with monitoring tools? You could deploy Prometheus/Grafana or an ELK stack on Compose so I'm not sure I understand what you mean
e.g. datadog, etc https://www.datadoghq.com/blog/monitoring-kubernetes-with-da...
that said, Grafana's own hosted solution "Grafana Cloud" gives Kubernetes operators...but not for anything else. https://grafana.com/docs/grafana-cloud/kubernetes-monitoring...
the entire ecosystem is supporting k8s. there's not much choice here.