feat: add get_health_metrics() via HP-MIB and IF-MIB

Implements SNMP health collection for ProCurve/Aruba switches using
HP-proprietary CPU/memory/uptime OIDs with IF-MIB interface counters.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

napalm_procurve/procurve.py

@@ -1091,6 +1091,68 @@ class ProcurveDriver(SwitchDriver):
 
         return {"success": success, "output": "\n".join(lines)}
 
+    # ------------------------------------------------------------------
+    # Health metrics (SNMP)
+    # ------------------------------------------------------------------
+
+    @classmethod
+    async def get_health_metrics(cls, snmp_get, snmp_walk) -> dict:
+        import asyncio
+        from napalm_device_types._ucd_metrics import build_if_metrics, ticks_to_seconds
+
+        _HP_CPU_STAT     = "1.3.6.1.4.1.11.2.14.11.5.1.9.6.1.0"
+        _HP_CPU_STAT_OLD = "1.3.6.1.4.1.11.2.3.7.8.6.1.0"
+        _HP_MEM_TOTAL    = "1.3.6.1.4.1.11.2.14.11.5.1.1.2.1.1.1.5.1"
+        _HP_MEM_USED     = "1.3.6.1.4.1.11.2.14.11.5.1.1.2.1.1.1.6.1"
+        _HP_UPTIME       = "1.3.6.1.4.1.11.2.14.11.1.2.4.1.5.1"
+        _OID_IF_DESCR    = "1.3.6.1.2.1.2.2.1.2"
+        _OID_IF_SPEED    = "1.3.6.1.2.1.2.2.1.5"
+        _OID_IF_IN_OCT   = "1.3.6.1.2.1.2.2.1.10"
+        _OID_IF_OUT_OCT  = "1.3.6.1.2.1.2.2.1.16"
+        _OID_IF_IN_ERR   = "1.3.6.1.2.1.2.2.1.14"
+        _OID_IF_OUT_ERR  = "1.3.6.1.2.1.2.2.1.20"
+
+        (hp_uptime, cpu_raw, cpu_old, mem_t, mem_u,
+         descr, speed, in_oct, out_oct, in_err, out_err) = await asyncio.gather(
+            snmp_get(_HP_UPTIME),
+            snmp_get(_HP_CPU_STAT),
+            snmp_get(_HP_CPU_STAT_OLD),
+            snmp_get(_HP_MEM_TOTAL),
+            snmp_get(_HP_MEM_USED),
+            snmp_walk(_OID_IF_DESCR),
+            snmp_walk(_OID_IF_SPEED),
+            snmp_walk(_OID_IF_IN_OCT),
+            snmp_walk(_OID_IF_OUT_OCT),
+            snmp_walk(_OID_IF_IN_ERR),
+            snmp_walk(_OID_IF_OUT_ERR),
+        )
+
+        metrics: dict = {}
+
+        secs = ticks_to_seconds(hp_uptime)
+        if secs is not None:
+            metrics["uptime_seconds"] = secs
+
+        cpu = cpu_raw or cpu_old
+        if cpu is not None:
+            try:
+                metrics["cpu_percent"] = float(cpu)
+            except ValueError:
+                pass
+
+        if mem_t and mem_u:
+            try:
+                total = int(mem_t)
+                used  = int(mem_u)
+                metrics["memory_total_bytes"] = total
+                metrics["memory_used_bytes"]  = used
+                metrics["memory_percent"]     = round(used / total * 100, 1) if total else 0.0
+            except ValueError:
+                pass
+
+        build_if_metrics(metrics, descr, speed, in_oct, out_oct, in_err, out_err)
+        return metrics
+
 
 # ---------------------------------------------------------------------------
 # Helpers
@@ -1161,3 +1223,4 @@ def _parse_ping_output(output: str, count: int) -> Dict:
             "results": results,
         }
     }
+