Extract drive temperature from storcli (#188)

Expose physical drive temperature in degrees Celsius if available.

Signed-off-by: Jason Valdron <[email protected]>

storcli.py

@@ -173,6 +173,11 @@
         ],
         namespace=namespace, registry=registry,
     ),
+    "pd_temp": Gauge(
+        "pd_temp_celsius",
+        "MegaRAID physical drive temperature in degrees Celsius",
+        ["controller", "enclosure", "slot"], namespace=namespace, registry=registry,
+    ),
     # fmt: on
 }
 
@@ -377,6 +382,11 @@ def create_metrics_of_physical_drive(physical_drive, detailed_info_array, contro
             attributes["Firmware Revision"].strip(),
             attributes["SN"].strip(),
         ).set(1)
+
+        if "Drive Temperature" in state:
+            metrics["pd_temp"].labels(controller_index, enclosure, slot).set(
+                state["Drive Temperature"].split("C")[0].strip()
+            )
     except KeyError:
         pass