You can just deploy other applications to Kubernetes, for example you can deploy this operator https://prometheus-operator.dev/ and you get Prometheus and Grafana running with a bunch of dashboards already created. Then you annotate your pods to tell Prometheus what to scrape, and you got monitoring. It also comes with AlertManager for alerting. Same for logging, you deploy Elasticsearch and Kibana and you're good to go.

As the other commentor said, you can deploy Prometheus/grafana into the k8s cluster and it pretty much does what you want it to do.