fix(agent): apply --disk-exclude to Docker agent disk metrics (#1237)

The Docker agent was not passing the disk exclusion list to
hostmetricsCollect(), so excluded mounts appeared in the Docker tab
disk totals. Also add server-side fsfilters filtering to Docker
report processing for parity with the host agent path.

cmd/pulse-agent/main.go

@@ -306,6 +306,7 @@ func run(ctx context.Context, args []string, getenv func(string) string) error {
 			IncludeServices:     true,
 			IncludeTasks:        true,
 			CollectDiskMetrics:  false,
+			DiskExclude:         cfg.DiskExclude,
 		}
 
 		dockerAgent, err = newDockerAgent(dockerCfg)

internal/dockeragent/agent.go

@@ -50,6 +50,7 @@ type Config struct {
 	IncludeTasks        bool
 	IncludeContainers   bool
 	CollectDiskMetrics  bool
+	DiskExclude         []string // Mount points or path prefixes to exclude from disk monitoring
 	LogLevel            zerolog.Level
 	Logger              *zerolog.Logger
 }

internal/dockeragent/collect.go

@@ -91,7 +91,7 @@ func (a *Agent) buildReport(ctx context.Context) (agentsdocker.Report, error) {
 	uptime := readSystemUptime()
 
 	metricsCtx, metricsCancel := context.WithTimeout(ctx, 10*time.Second)
-	snapshot, err := hostmetricsCollect(metricsCtx, nil)
+	snapshot, err := hostmetricsCollect(metricsCtx, a.cfg.DiskExclude)
 	metricsCancel()
 	if err != nil {
 		return agentsdocker.Report{}, fmt.Errorf("collect host metrics: %w", err)

internal/monitoring/monitor.go

@@ -2187,6 +2187,11 @@ func (m *Monitor) ApplyDockerReport(report agentsdocker.Report, tokenRecord *con
 
 	disks := make([]models.Disk, 0, len(report.Host.Disks))
 	for _, disk := range report.Host.Disks {
+		// Filter virtual/system filesystems (same as ApplyHostReport) to avoid
+		// inflated disk totals from tmpfs, overlayfs, etc.
+		if shouldSkip, _ := fsfilters.ShouldSkipFilesystem(disk.Type, disk.Mountpoint, uint64(disk.TotalBytes), uint64(disk.UsedBytes)); shouldSkip {
+			continue
+		}
 		disks = append(disks, models.Disk{
 			Total:      disk.TotalBytes,
 			Used:       disk.UsedBytes,