Fix: Prevent single node auth failure from disabling global SSH temperature collection

- Removed global legacySSHDisabled flag that was triggered by any single node auth failure
- Changed disableLegacySSHOnAuthFailure to only log warnings
- Fixed potential context leak in monitor.go
- Updated tests to reflect removal of global disable logic

internal/monitoring/monitor.go

@@ -6160,6 +6160,7 @@ func (m *Monitor) pollPVEInstance(ctx context.Context, instanceName string, clie
 		}
 		if effectiveStatus == "online" && m.tempCollector != nil && tempMonitoringEnabled {
 			tempCtx, tempCancel := context.WithTimeout(ctx, 30*time.Second) // Increased to accommodate SSH operations via proxy
+			defer tempCancel()
 
 			// Determine SSH hostname to use (most robust approach):
 			// Prefer the resolved host for this node, with cluster overrides when available.
@@ -6199,7 +6200,6 @@ func (m *Monitor) pollPVEInstance(ctx context.Context, instanceName string, clie
 
 				// Use HTTP proxy if configured for this instance, otherwise fall back to socket/SSH
 				temp, err := m.tempCollector.CollectTemperatureWithProxy(tempCtx, sshHost, node.Node, instanceCfg.TemperatureProxyURL, instanceCfg.TemperatureProxyToken)
-				tempCancel()
 
 				if err == nil && temp != nil && temp.Available {
 					// Get the current CPU temperature (prefer package, fall back to max)

internal/monitoring/temperature.go

@@ -45,7 +45,6 @@ type TemperatureCollector struct {
 	proxyCooldownUntil time.Time
 	proxyHostStates    map[string]*proxyHostState
 	missingKeyWarned   atomic.Bool
-	legacySSHDisabled  atomic.Bool
 }
 
 type proxyHostState struct {
@@ -184,10 +183,6 @@ func (tc *TemperatureCollector) CollectTemperatureWithProxy(ctx context.Context,
 			return &models.Temperature{Available: false}, nil
 		}
 
-		if tc.legacySSHDisabled.Load() {
-			return &models.Temperature{Available: false}, nil
-		}
-
 		if strings.TrimSpace(tc.sshKeyPath) == "" {
 			tc.logMissingSSHKey(nil)
 			return &models.Temperature{Available: false}, nil
@@ -347,13 +342,12 @@ func (tc *TemperatureCollector) disableLegacySSHOnAuthFailure(err error, nodeNam
 		return false
 	}
 
-	if tc.legacySSHDisabled.CompareAndSwap(false, true) {
-		log.Warn().
-			Str("node", nodeName).
-			Str("host", host).
-			Err(err).
-			Msg("Disabling legacy SSH temperature collection after authentication failure; configure pulse-sensor-proxy or adjust SSH access.")
-	}
+	// Do not disable globally on single node failure
+	log.Warn().
+		Str("node", nodeName).
+		Str("host", host).
+		Err(err).
+		Msg("SSH temperature collection failed due to authentication error; check SSH keys")
 
 	return true
 }

internal/monitoring/temperature_test.go

@@ -623,20 +623,18 @@ func TestDisableLegacySSHOnAuthFailure(t *testing.T) {
 	collector := &TemperatureCollector{}
 
 	if !collector.disableLegacySSHOnAuthFailure(fmt.Errorf("ssh command failed: Permission denied (publickey)."), "node-1", "host-1") {
-		t.Fatalf("expected authentication errors to disable legacy SSH")
-	}
-	if !collector.legacySSHDisabled.Load() {
-		t.Fatalf("expected legacy SSH to be marked disabled")
+		t.Fatalf("expected authentication errors to be detected")
 	}
+	// legacySSHDisabled check removed as we no longer globally disable SSH
 
-	// Repeated auth errors should still return true but not change the flag.
+	// Repeated auth errors should still return true
 	if !collector.disableLegacySSHOnAuthFailure(fmt.Errorf("permission denied"), "node-1", "host-1") {
-		t.Fatalf("expected repeated authentication errors to continue reporting disabled state")
+		t.Fatalf("expected repeated authentication errors to be detected")
 	}
 
-	// Non-authentication errors should not trigger disablement.
+	// Non-authentication errors should not trigger detection
 	if collector.disableLegacySSHOnAuthFailure(fmt.Errorf("connection timed out"), "node-1", "host-1") {
-		t.Fatalf("expected non-authentication errors to leave legacy SSH enabled")
+		t.Fatalf("expected non-authentication errors to be ignored")
 	}
 }