Filter dead temp sensors from SES health and recompute overall status

Xyratex HB-1235 enclosures have non-functional temperature sensor
slots that report Unrecoverable/Unknown at 0°C. The SES header
rolls these into UNRECOV=1, causing a false CRITICAL flag. Now we
skip dead sensors (0°C + non-OK status) and derive overall_status
from the actual parsed elements instead of the raw header counts.

services/enclosure.py

@@ -183,21 +183,6 @@ def _parse_ses_page02(text: str) -> dict:
         "voltages": [],
     }
 
-    # Parse header line for overall status:
-    # INVOP=0, INFO=0, NON-CRIT=0, CRIT=1, UNRECOV=0
-    header_match = re.search(
-        r"INVOP=\d+,\s*INFO=\d+,\s*NON-CRIT=(\d+),\s*CRIT=(\d+),\s*UNRECOV=(\d+)",
-        text,
-    )
-    if header_match:
-        non_crit = int(header_match.group(1))
-        crit = int(header_match.group(2))
-        unrecov = int(header_match.group(3))
-        if crit > 0 or unrecov > 0:
-            result["overall_status"] = "CRITICAL"
-        elif non_crit > 0:
-            result["overall_status"] = "WARNING"
-
     # Split into element type sections.
     # Each section starts with "Element type: <type>"
     sections = re.split(r"(?=\s*Element type:)", text)
@@ -250,6 +235,12 @@ def _parse_ses_page02(text: str) -> dict:
             elif "temperature" in element_type:
                 temp_match = re.search(r"Temperature=\s*([\d.]+)\s*C", elem_text)
                 temp = float(temp_match.group(1)) if temp_match else None
+                # Skip dead/disconnected sensors: 0°C with a non-OK status
+                # is a non-functional sensor slot, not an actual reading.
+                if (temp is None or temp == 0) and status.lower() in (
+                    "unrecoverable", "unknown", "not available",
+                ):
+                    continue
                 result["temps"].append({
                     "index": idx,
                     "status": status,
@@ -267,4 +258,21 @@ def _parse_ses_page02(text: str) -> dict:
                     "voltage": voltage,
                 })
 
+    # Derive overall_status from the actual parsed elements rather than
+    # the raw SES header, which counts dead/disconnected sensors as
+    # UNRECOV and inflates severity.
+    all_statuses = (
+        [e["status"] for e in result["psus"]]
+        + [e["status"] for e in result["fans"]]
+        + [e["status"] for e in result["temps"]]
+        + [e["status"] for e in result["voltages"]]
+    )
+    status_lower = [s.lower() for s in all_statuses]
+    if any(s in ("unrecoverable", "critical") for s in status_lower):
+        result["overall_status"] = "CRITICAL"
+    elif any(s in ("noncritical", "non-critical", "warning") for s in status_lower):
+        result["overall_status"] = "WARNING"
+    elif any(s not in ("ok", "unknown") for s in status_lower):
+        result["overall_status"] = "WARNING"
+
     return result