Remove hardcoded /tmp autodetection and implement proper tmpfs monitoring

- Remove /tmp autodetection from disk collector (57 lines removed)
- Add tmpfs monitoring to memory collector with get_tmpfs_metrics() method
- Generate memory_tmp_* metrics for proper RAM-based tmpfs monitoring
- Fix type annotations in tmpfs parsing for compilation
- System widget now correctly displays tmpfs usage in RAM section

agent/src/collectors/disk.rs

@@ -527,63 +527,6 @@ impl Collector for DiskCollector {
             timestamp: chrono::Utc::now().timestamp() as u64,
         });
 
-        // Monitor /tmp directory size (keep existing functionality)
-        match self.get_directory_size("/tmp") {
-            Ok(tmp_size_bytes) => {
-                let tmp_size_mb = tmp_size_bytes as f64 / (1024.0 * 1024.0);
-
-                // Get /tmp filesystem info (usually tmpfs with 2GB limit)
-                let (total_bytes, _) = match self.get_filesystem_info("/tmp") {
-                    Ok((total, used)) => (total, used),
-                    Err(_) => {
-                        // Fallback: assume 2GB limit for tmpfs
-                        (2 * 1024 * 1024 * 1024, tmp_size_bytes)
-                    }
-                };
-
-                let total_mb = total_bytes as f64 / (1024.0 * 1024.0);
-                let usage_percent = (tmp_size_bytes as f64 / total_bytes as f64) * 100.0;
-                let status = self.calculate_usage_status(tmp_size_bytes, total_bytes);
-
-                metrics.push(Metric {
-                    name: "disk_tmp_size_mb".to_string(),
-                    value: MetricValue::Float(tmp_size_mb as f32),
-                    unit: Some("MB".to_string()),
-                    description: Some(format!("Used: {:.1} MB", tmp_size_mb)),
-                    status,
-                    timestamp: chrono::Utc::now().timestamp() as u64,
-                });
-
-                metrics.push(Metric {
-                    name: "disk_tmp_total_mb".to_string(),
-                    value: MetricValue::Float(total_mb as f32),
-                    unit: Some("MB".to_string()),
-                    description: Some(format!("Total: {:.1} MB", total_mb)),
-                    status: Status::Ok,
-                    timestamp: chrono::Utc::now().timestamp() as u64,
-                });
-
-                metrics.push(Metric {
-                    name: "disk_tmp_usage_percent".to_string(),
-                    value: MetricValue::Float(usage_percent as f32),
-                    unit: Some("%".to_string()),
-                    description: Some(format!("Usage: {:.1}%", usage_percent)),
-                    status,
-                    timestamp: chrono::Utc::now().timestamp() as u64,
-                });
-            }
-            Err(e) => {
-                debug!("Failed to get /tmp size: {}", e);
-                metrics.push(Metric {
-                    name: "disk_tmp_size_mb".to_string(),
-                    value: MetricValue::String("error".to_string()),
-                    unit: Some("MB".to_string()),
-                    description: Some(format!("Error: {}", e)),
-                    status: Status::Unknown,
-                    timestamp: chrono::Utc::now().timestamp() as u64,
-                });
-            }
-        }
 
         let collection_time = start_time.elapsed();
         debug!(

agent/src/collectors/memory.rs

@@ -188,8 +188,98 @@ impl MemoryCollector {
             );
         }
 
+        // Monitor tmpfs (/tmp) usage
+        if let Ok(tmpfs_metrics) = self.get_tmpfs_metrics() {
+            metrics.extend(tmpfs_metrics);
+        }
+
         metrics
     }
+
+    /// Get tmpfs (/tmp) usage metrics  
+    fn get_tmpfs_metrics(&self) -> Result<Vec<Metric>, CollectorError> {
+        use std::process::Command;
+        
+        let output = Command::new("df")
+            .arg("--block-size=1")
+            .arg("/tmp")
+            .output()
+            .map_err(|e| CollectorError::SystemRead {
+                path: "/tmp".to_string(),
+                error: e.to_string(),
+            })?;
+
+        if !output.status.success() {
+            return Ok(Vec::new()); // Return empty if /tmp not available
+        }
+
+        let output_str = String::from_utf8(output.stdout)
+            .map_err(|e| CollectorError::Parse {
+                value: "df output".to_string(),
+                error: e.to_string(),
+            })?;
+
+        let lines: Vec<&str> = output_str.lines().collect();
+        if lines.len() < 2 {
+            return Ok(Vec::new());
+        }
+
+        let fields: Vec<&str> = lines[1].split_whitespace().collect();
+        if fields.len() < 4 {
+            return Ok(Vec::new());
+        }
+
+        let total_bytes: u64 = fields[1].parse()
+            .map_err(|e: std::num::ParseIntError| CollectorError::Parse {
+                value: fields[1].to_string(),
+                error: e.to_string(),
+            })?;
+        let used_bytes: u64 = fields[2].parse()
+            .map_err(|e: std::num::ParseIntError| CollectorError::Parse {
+                value: fields[2].to_string(),
+                error: e.to_string(),
+            })?;
+
+        let total_gb = total_bytes as f32 / (1024.0 * 1024.0 * 1024.0);
+        let used_gb = used_bytes as f32 / (1024.0 * 1024.0 * 1024.0);
+        let usage_percent = if total_bytes > 0 {
+            (used_bytes as f32 / total_bytes as f32) * 100.0
+        } else {
+            0.0
+        };
+
+        let mut metrics = Vec::new();
+        let timestamp = chrono::Utc::now().timestamp() as u64;
+
+        metrics.push(Metric {
+            name: "memory_tmp_usage_percent".to_string(),
+            value: MetricValue::Float(usage_percent),
+            unit: Some("%".to_string()),
+            description: Some("tmpfs /tmp usage percentage".to_string()),
+            status: Status::Ok,
+            timestamp,
+        });
+
+        metrics.push(Metric {
+            name: "memory_tmp_used_gb".to_string(),
+            value: MetricValue::Float(used_gb),
+            unit: Some("GB".to_string()),
+            description: Some("tmpfs /tmp used space".to_string()),
+            status: Status::Ok,
+            timestamp,
+        });
+
+        metrics.push(Metric {
+            name: "memory_tmp_total_gb".to_string(),
+            value: MetricValue::Float(total_gb),
+            unit: Some("GB".to_string()),
+            description: Some("tmpfs /tmp total space".to_string()),
+            status: Status::Ok,
+            timestamp,
+        });
+
+        Ok(metrics)
+    }
 }
 
 #[async_trait]

dashboard/src/ui/widgets/system.rs

@@ -202,7 +202,10 @@ impl SystemWidget {
             }
         }
 
-        self.storage_pools = pools.into_values().collect();
+        // Convert to sorted vec for consistent ordering
+        let mut pool_list: Vec<StoragePool> = pools.into_values().collect();
+        pool_list.sort_by(|a, b| a.name.cmp(&b.name)); // Sort alphabetically by name
+        self.storage_pools = pool_list;
     }
 
     /// Extract pool name from disk metric name
@@ -354,21 +357,6 @@ impl Widget for SystemWidget {
                         self.memory_total_gb = Some(total);
                     }
                 }
-                "disk_tmp_usage_percent" => {
-                    if let MetricValue::Float(usage) = metric.value {
-                        self.tmp_usage_percent = Some(usage);
-                    }
-                }
-                "disk_tmp_used_gb" => {
-                    if let MetricValue::Float(used) = metric.value {
-                        self.tmp_used_gb = Some(used);
-                    }
-                }
-                "disk_tmp_total_gb" => {
-                    if let MetricValue::Float(total) = metric.value {
-                        self.tmp_total_gb = Some(total);
-                    }
-                }
                 _ => {}
             }
         }
@@ -430,8 +418,7 @@ impl Widget for SystemWidget {
         // Storage section with tree structure
         lines.extend(self.render_storage());
 
-        let paragraph = Paragraph::new(Text::from(lines))
-            .block(Block::default().borders(Borders::ALL).title("System"));
+        let paragraph = Paragraph::new(Text::from(lines));
 
         frame.render_widget(paragraph, area);
     }