Fix temperature duplication in MQTT payload

Temperature now only appears at root level, not in details.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

checkers/snmp.py

@@ -54,17 +54,15 @@ class SnmpChecker(BaseChecker):
                     response_time=None
                 )
             else:
-                details = {str(oid): str(val) for oid, val in var_binds}
+                # Only include main OID in details, not temperature
+                details = {str(var_binds[0][0]): str(var_binds[0][1])}
 
-                # Extract temperature if configured
-                if temperature_oid:
-                    for oid_key, val in var_binds:
-                        if str(oid_key) == temperature_oid:
-                            try:
-                                details["temperature"] = int(val)
-                            except (ValueError, TypeError):
-                                pass  # Ignore if not a valid integer
-                            break
+                # Extract temperature if configured (second OID in response)
+                if temperature_oid and len(var_binds) >= 2:
+                    try:
+                        details["temperature"] = int(var_binds[1][1])
+                    except (ValueError, TypeError):
+                        pass  # Ignore if not a valid integer
 
                 return CheckResult(
                     success=True,