[nancy] pdu-grappe2.nancy cannot be socket monitored - basic Eaton PDU

data/grid5000/sites/nancy/pdus/grappe-pdu2.json

 {
   "ip": "172.17.79.250",
   "mac": "00:20:85:F9:12:C4",
-  "metrics": [
-    {
-      "description": "Power consumption per outlet reported by PDU, in watt",
-      "name": "pdu_outlet_power_watt",
-      "period": 1000,
-      "source": {
-        "id": "1.3.6.1.4.1.534.6.6.7.6.5.1.3.0.%PORT%",
-        "protocol": "snmp"
-      }
-    }
-  ],
   "model": "eMAA13",
   "ports": {
     "10": "grappe-6",