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Copies the exact 157-metric list from the Linux Node integration's Metrics anchor as the cadvisor keep-list already does for Docker (16 metrics). Replaces the earlier `drop node_scrape_collector_.+` rule, which was the integration page's alternate snippet but didn't ship the explicit allowlist users see in the docs. `instance:node_num_cpu:sum` from the Metrics section is intentionally omitted — it's a recording-rule output computed server-side by Grafana Cloud's ruler, not produced by the agent. Doc + README updated to point at the Metrics anchors directly so the source of truth is unambiguous.