atlasbot: add per-hardware extremes

services/comms/scripts/atlasbot/bot.py

@@ -1145,6 +1145,33 @@ def facts_context(
                 rate=metric in ("net", "io"),
             )
             lines.append(f"- lowest_{metric}: {node} ({value_fmt})")
+        for metric in ("cpu", "ram"):
+            hottest_parts: list[str] = []
+            lowest_parts: list[str] = []
+            for hw, nodes_list in sorted(by_hardware.items()):
+                entries = []
+                for entry in usage_table:
+                    node = entry.get("node")
+                    if node in nodes_list and entry.get(metric) is not None:
+                        try:
+                            value = float(entry.get(metric))
+                        except (TypeError, ValueError):
+                            continue
+                        entries.append((node, value))
+                if not entries:
+                    continue
+                max_node, max_val = max(entries, key=lambda item: item[1])
+                min_node, min_val = min(entries, key=lambda item: item[1])
+                hottest_parts.append(
+                    f"{hw}={max_node} ({_format_metric_value(str(max_val), percent=True)})"
+                )
+                lowest_parts.append(
+                    f"{hw}={min_node} ({_format_metric_value(str(min_val), percent=True)})"
+                )
+            if hottest_parts:
+                lines.append(f"- hottest_{metric}_by_hardware: {', '.join(hottest_parts)}")
+            if lowest_parts:
+                lines.append(f"- lowest_{metric}_by_hardware: {', '.join(lowest_parts)}")
 
     if nodes_in_query:
         lines.append("- node_details:")