The blog post by Malcolm Holmes explains how to connect Prometheus-Ksonnet to Grafana Cloud, offering a solution for monitoring large clusters by overcoming limitations of local installations. Grafana Cloud Hosted Prometheus provides long-term storage, supports multiple clusters, and ensures high availability, making it suitable for advanced monitoring needs. The post includes step-by-step instructions for setting up a Grafana Cloud account, creating a Hosted Metrics Instance, and configuring Prometheus with the necessary URL, user ID, and API key for integration. By adding remote write configurations and external labels, users can distinguish and manage metrics from different clusters, enabling seamless querying of both local and cloud-hosted Prometheus data. The guide emphasizes the ease of managing metrics across multiple clusters and the benefits of using Grafana Cloud for enhanced monitoring capabilities.