Historical Trend Graphs for Disk Space Utilization in Service Monitor

Service Monitor currently displays only the current disk space utilization percentage for monitored servers, without a historical trend view. Unlike CPU, Memory, and Network metrics, which show utilization history over time, disk usage lacks a comparable trend graph, making it difficult to detect gradual capacity creep on individual mount points or drives. This enhancement would add historical trend graphing for disk space utilization, consistent with existing CPU/Memory/Network history views, and would include a snapshot of that trend graph within disk space email alerts. Customers would gain the ability to distinguish between stable high-utilization conditions and steadily increasing utilization, allowing proactive capacity planning and reducing the risk of unplanned outages caused by disk exhaustion.