fix: guest alerts and webhook notifications working properly

- Fixed double CPU percentage multiplication for containers/VMs
- Added CheckGuest calls to efficient polling path
- Fixed newline escaping in grouped webhook notifications
- Guest alerts now properly trigger for containers and VMs

These changes address issues where guest alerts weren't being triggered
at all due to the efficient polling path not calling CheckGuest, and
webhook notifications were failing due to unescaped newlines in grouped
alert messages breaking JSON templates.

internal/alerts/alerts.go

@@ -403,7 +403,7 @@ func (m *Manager) CheckGuest(guest interface{}, instanceName string) {
 		node = g.Node
 		status = g.Status
 		guestType = "VM"
-		cpu = g.CPU * 100 // Convert to percentage
+		cpu = g.CPU // Already in percentage
 		memUsage = g.Memory.Usage
 		diskUsage = g.Disk.Usage
 		diskRead = g.DiskRead
@@ -416,7 +416,7 @@ func (m *Manager) CheckGuest(guest interface{}, instanceName string) {
 		node = g.Node
 		status = g.Status
 		guestType = "Container"
-		cpu = g.CPU * 100 // Convert to percentage
+		cpu = g.CPU // Already in percentage
 		memUsage = g.Memory.Usage
 		diskUsage = g.Disk.Usage
 		diskRead = g.DiskRead
@@ -450,7 +450,7 @@ func (m *Manager) CheckGuest(guest interface{}, instanceName string) {
 	m.mu.RUnlock()
 
 	// Check each metric
-	log.Debug().
+	log.Info().
 		Str("guest", name).
 		Float64("cpu", cpu).
 		Float64("memory", memUsage).

internal/monitoring/monitor.go

@@ -924,6 +924,9 @@ func (m *Monitor) pollVMsAndContainersEfficient(ctx context.Context, instanceNam
 			
 			allVMs = append(allVMs, vm)
 			
+			// Check thresholds for alerts
+			m.alertManager.CheckGuest(vm, instanceName)
+			
 		} else if res.Type == "lxc" {
 			// Skip templates if configured
 			if res.Template == 1 {
@@ -966,6 +969,9 @@ func (m *Monitor) pollVMsAndContainersEfficient(ctx context.Context, instanceNam
 			}
 			
 			allContainers = append(allContainers, container)
+			
+			// Check thresholds for alerts
+			m.alertManager.CheckGuest(container, instanceName)
 		}
 	}
 	
@@ -1241,6 +1247,7 @@ func (m *Monitor) pollContainersWithNodes(ctx context.Context, instanceName stri
 			m.metricsHistory.AddGuestMetric(modelCT.ID, "netout", float64(modelCT.NetworkOut), now)
 
 			// Check thresholds for alerts
+			log.Info().Str("container", modelCT.Name).Msg("Checking container alerts")
 			m.alertManager.CheckGuest(modelCT, instanceName)
 		}
 	}