node-exporter disk graphs

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This dashboard monitors node disk and memory I/O performance, providing per-core IO wait, disk activity, and bandwidth metrics derived from Prometheus. It highlights key signals such as memory pressure with node_memory_Active_bytes alongside disk operations like node_disk_io_time_seconds_total, and captures latency and throughput with panels for reads and writes (e.g., Read latency, Write latency, Read bandwidth, Write bandwidth). It also surfaces OOM-related events via node_vmstat_oom_kill and uses RateInterval for rate-based metrics to normalize time-series data.