Merge pull request #5 from christophe-duc/feature/add_pod_stats

added pod stats feature

pkg/commands/container_stats.go

@@ -175,6 +175,9 @@ func (c *Container) eraseOldHistory(maxDuration time.Duration) {
 			return
 		}
 	}
+
+	// All entries are older than maxDuration, clear the history
+	c.StatHistory = nil
 }
 
 func (c *Container) GetLastStats() (*RecordedStats, bool) {

pkg/commands/pod.go

@@ -1,17 +1,30 @@
 package commands
 
 import (
+	"time"
+
+	"github.com/sasha-s/go-deadlock"
 	"github.com/sirupsen/logrus"
 )
 
 // Pod represents a Podman pod with its containers.
 type Pod struct {
-	ID         string
-	Name       string
-	Summary    PodSummary
-	Containers []*Container // Non-infra containers in this pod
-	OSCommand  *OSCommand
-	Log        *logrus.Entry
+	ID              string
+	Name            string
+	Summary         PodSummary
+	Containers      []*Container // Non-infra containers in this pod
+	OSCommand       *OSCommand
+	Log             *logrus.Entry
+	Runtime         ContainerRuntime
+	StatHistory     []*RecordedPodStats
+	MonitoringStats bool
+	StatsMutex      deadlock.Mutex
+}
+
+// RecordedPodStats contains the pod stats we've received from Podman.
+type RecordedPodStats struct {
+	Stats      PodStatsEntry
+	RecordedAt time.Time
 }
 
 // State returns the pod state.
@@ -34,3 +47,40 @@ func (p *Pod) GetRunningContainerCount() int {
 	}
 	return count
 }
+
+// appendStats adds a new stats entry to the pod's history.
+func (p *Pod) appendStats(stats *RecordedPodStats, maxDuration time.Duration) {
+	p.StatsMutex.Lock()
+	defer p.StatsMutex.Unlock()
+
+	p.StatHistory = append(p.StatHistory, stats)
+	p.eraseOldHistory(maxDuration)
+}
+
+// eraseOldHistory removes any history before the user-specified max duration.
+func (p *Pod) eraseOldHistory(maxDuration time.Duration) {
+	if maxDuration == 0 {
+		return
+	}
+
+	for i, stat := range p.StatHistory {
+		if time.Since(stat.RecordedAt) < maxDuration {
+			p.StatHistory = p.StatHistory[i:]
+			return
+		}
+	}
+
+	// All entries are older than maxDuration, clear the history
+	p.StatHistory = nil
+}
+
+// GetLastStats returns the most recent stats entry.
+func (p *Pod) GetLastStats() (*RecordedPodStats, bool) {
+	p.StatsMutex.Lock()
+	defer p.StatsMutex.Unlock()
+	history := p.StatHistory
+	if len(history) == 0 {
+		return nil, false
+	}
+	return history[len(history)-1], true
+}

pkg/commands/podman.go

@@ -348,6 +348,35 @@ func calculateMemoryPercentageFromEntry(stats ContainerStatsEntry) float64 {
 	return 0.0
 }
 
+// CreatePodStatMonitor starts monitoring stats for a pod
+func (c *PodmanCommand) CreatePodStatMonitor(pod *Pod) {
+	pod.MonitoringStats = true
+
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+
+	statsChan, errChan := c.Runtime.PodStats(ctx, pod.ID, true)
+
+	go func() {
+		for err := range errChan {
+			if err != nil {
+				c.Log.Error(err)
+			}
+		}
+	}()
+
+	for stats := range statsChan {
+		recordedStats := &RecordedPodStats{
+			Stats:      stats,
+			RecordedAt: time.Now(),
+		}
+
+		pod.appendStats(recordedStats, c.Config.UserConfig.Stats.MaxDuration)
+	}
+
+	pod.MonitoringStats = false
+}
+
 func (c *PodmanCommand) RefreshContainersAndServices(currentServices []*Service, currentItems []*ContainerListItem) ([]*ContainerListItem, []*Service, error) {
 	c.ServiceMutex.Lock()
 	defer c.ServiceMutex.Unlock()
@@ -455,6 +484,7 @@ func (c *PodmanCommand) buildContainerListItems(containers []*Container, podSumm
 			Containers: podCtrs,
 			OSCommand:  c.OSCommand,
 			Log:        c.Log,
+			Runtime:    c.Runtime,
 		}
 
 		// Add pod item

pkg/commands/runtime.go

@@ -39,6 +39,7 @@ type ContainerRuntime interface {
 
 	// Pod operations
 	ListPods(ctx context.Context) ([]PodSummary, error)
+	PodStats(ctx context.Context, id string, stream bool) (<-chan PodStatsEntry, <-chan error)
 
 	// Events streams container/image/volume/network events
 	Events(ctx context.Context) (<-chan Event, <-chan error)

pkg/commands/runtime_libpod.go

@@ -336,6 +336,106 @@ func (r *LibpodRuntime) ListPods(ctx context.Context) ([]PodSummary, error) {
 	return result, nil
 }
 
+// PodStats streams pod statistics by aggregating stats from all containers in the pod.
+func (r *LibpodRuntime) PodStats(ctx context.Context, id string, stream bool) (<-chan PodStatsEntry, <-chan error) {
+	statsChan := make(chan PodStatsEntry)
+	errChan := make(chan error, 1)
+
+	go func() {
+		defer close(statsChan)
+		defer close(errChan)
+
+		pod, err := r.runtime.LookupPod(id)
+		if err != nil {
+			errChan <- err
+			return
+		}
+
+		for {
+			entry, err := r.aggregatePodContainerStats(ctx, pod)
+			if err != nil {
+				errChan <- err
+				return
+			}
+
+			select {
+			case statsChan <- entry:
+			case <-ctx.Done():
+				return
+			}
+
+			if !stream {
+				return
+			}
+			time.Sleep(time.Second)
+		}
+	}()
+
+	return statsChan, errChan
+}
+
+// aggregatePodContainerStats collects and aggregates stats from all containers in a pod.
+func (r *LibpodRuntime) aggregatePodContainerStats(ctx context.Context, pod *libpod.Pod) (PodStatsEntry, error) {
+	ctrs, err := pod.AllContainers()
+	if err != nil {
+		return PodStatsEntry{}, err
+	}
+
+	var entry PodStatsEntry
+	entry.PodID = pod.ID()
+	entry.PodName = pod.Name()
+
+	var totalMemUsage, totalMemLimit uint64
+	var totalNetIn, totalNetOut uint64
+	var totalBlockIn, totalBlockOut uint64
+	var totalPIDs uint64
+	var totalCPU float64
+
+	for _, ctr := range ctrs {
+		// Skip infra containers
+		if ctr.IsInfra() {
+			continue
+		}
+
+		state, err := ctr.State()
+		if err != nil || state != define.ContainerStateRunning {
+			continue
+		}
+
+		stats, err := ctr.GetContainerStats(nil)
+		if err != nil {
+			continue // Skip containers that fail to get stats
+		}
+
+		totalCPU += stats.CPU
+		totalMemUsage += stats.MemUsage
+		totalMemLimit += stats.MemLimit
+		totalPIDs += stats.PIDs
+
+		// Aggregate network stats
+		totalNetIn += stats.NetInput
+		totalNetOut += stats.NetOutput
+
+		// Aggregate block I/O stats
+		totalBlockIn += stats.BlockInput
+		totalBlockOut += stats.BlockOutput
+	}
+
+	entry.CPU = totalCPU
+	entry.MemUsage = totalMemUsage
+	entry.MemLimit = totalMemLimit
+	if totalMemLimit > 0 {
+		entry.Memory = float64(totalMemUsage) / float64(totalMemLimit) * 100
+	}
+	entry.NetInput = totalNetIn
+	entry.NetOutput = totalNetOut
+	entry.BlockInput = totalBlockIn
+	entry.BlockOutput = totalBlockOut
+	entry.PIDs = totalPIDs
+
+	return entry, nil
+}
+
 // Events streams container runtime events.
 // For libpod, we use a polling approach since direct event streaming requires more setup.
 func (r *LibpodRuntime) Events(ctx context.Context) (<-chan Event, <-chan error) {

pkg/commands/runtime_libpod_stub.go

@@ -72,10 +72,12 @@ func (r *LibpodRuntime) PruneContainers(ctx context.Context) error {
 }
 
 func (r *LibpodRuntime) ContainerStats(ctx context.Context, id string, stream bool) (<-chan ContainerStatsEntry, <-chan error) {
+	statsChan := make(chan ContainerStatsEntry)
+	close(statsChan)
 	errChan := make(chan error, 1)
 	errChan <- ErrLibpodNotAvailable
 	close(errChan)
-	return nil, errChan
+	return statsChan, errChan
 }
 
 // Image operations - all return ErrLibpodNotAvailable
@@ -134,10 +136,21 @@ func (r *LibpodRuntime) ListPods(ctx context.Context) ([]PodSummary, error) {
 	return nil, ErrLibpodNotAvailable
 }
 
-// Events returns an error channel on non-Linux platforms.
-func (r *LibpodRuntime) Events(ctx context.Context) (<-chan Event, <-chan error) {
+func (r *LibpodRuntime) PodStats(ctx context.Context, id string, stream bool) (<-chan PodStatsEntry, <-chan error) {
+	statsChan := make(chan PodStatsEntry)
+	close(statsChan)
 	errChan := make(chan error, 1)
 	errChan <- ErrLibpodNotAvailable
 	close(errChan)
-	return nil, errChan
+	return statsChan, errChan
+}
+
+// Events returns an error channel on non-Linux platforms.
+func (r *LibpodRuntime) Events(ctx context.Context) (<-chan Event, <-chan error) {
+	eventsChan := make(chan Event)
+	close(eventsChan)
+	errChan := make(chan error, 1)
+	errChan <- ErrLibpodNotAvailable
+	close(errChan)
+	return eventsChan, errChan
 }

pkg/commands/runtime_mock.go

@@ -41,6 +41,7 @@ type MockRuntime struct {
 
 	// Pod operation mocks
 	ListPodsFunc func(ctx context.Context) ([]PodSummary, error)
+	PodStatsFunc func(ctx context.Context, id string, stream bool) (<-chan PodStatsEntry, <-chan error)
 
 	// Event mock
 	EventsFunc func(ctx context.Context) (<-chan Event, <-chan error)
@@ -154,10 +155,12 @@ func (m *MockRuntime) ContainerStats(ctx context.Context, id string, stream bool
 	if m.ContainerStatsFunc != nil {
 		return m.ContainerStatsFunc(ctx, id, stream)
 	}
+	statsCh := make(chan ContainerStatsEntry)
+	close(statsCh)
 	errCh := make(chan error, 1)
 	errCh <- ErrMockNotImplemented
 	close(errCh)
-	return nil, errCh
+	return statsCh, errCh
 }
 
 // Image operations
@@ -264,6 +267,19 @@ func (m *MockRuntime) ListPods(ctx context.Context) ([]PodSummary, error) {
 	return nil, ErrMockNotImplemented
 }
 
+func (m *MockRuntime) PodStats(ctx context.Context, id string, stream bool) (<-chan PodStatsEntry, <-chan error) {
+	m.recordCall("PodStats", id, stream)
+	if m.PodStatsFunc != nil {
+		return m.PodStatsFunc(ctx, id, stream)
+	}
+	statsCh := make(chan PodStatsEntry)
+	close(statsCh)
+	errCh := make(chan error, 1)
+	errCh <- ErrMockNotImplemented
+	close(errCh)
+	return statsCh, errCh
+}
+
 // Events
 
 func (m *MockRuntime) Events(ctx context.Context) (<-chan Event, <-chan error) {
@@ -271,10 +287,12 @@ func (m *MockRuntime) Events(ctx context.Context) (<-chan Event, <-chan error) {
 	if m.EventsFunc != nil {
 		return m.EventsFunc(ctx)
 	}
+	eventsCh := make(chan Event)
+	close(eventsCh)
 	errCh := make(chan error, 1)
 	errCh <- ErrMockNotImplemented
 	close(errCh)
-	return nil, errCh
+	return eventsCh, errCh
 }
 
 // Lifecycle

pkg/commands/runtime_socket.go

@@ -3,6 +3,7 @@ package commands
 import (
 	"context"
 	"encoding/json"
+	"fmt"
 	"strings"
 	"time"
 
@@ -297,6 +298,181 @@ func (r *SocketRuntime) ListPods(ctx context.Context) ([]PodSummary, error) {
 	return result, nil
 }
 
+// PodStats streams pod statistics. The Podman API returns stats for each container
+// in the pod, so we aggregate them into a single PodStatsEntry.
+func (r *SocketRuntime) PodStats(ctx context.Context, id string, stream bool) (<-chan PodStatsEntry, <-chan error) {
+	statsChan := make(chan PodStatsEntry)
+	errChan := make(chan error, 1)
+
+	go func() {
+		defer close(statsChan)
+		defer close(errChan)
+
+		ticker := time.NewTicker(time.Second)
+		defer ticker.Stop()
+
+		for {
+			reports, err := pods.Stats(r.conn, []string{id}, nil)
+			if err != nil {
+				errChan <- err
+				return
+			}
+
+			entry := aggregatePodStats(reports)
+			select {
+			case statsChan <- entry:
+			case <-ctx.Done():
+				return
+			}
+
+			if !stream {
+				return
+			}
+
+			select {
+			case <-ticker.C:
+			case <-ctx.Done():
+				return
+			}
+		}
+	}()
+
+	return statsChan, errChan
+}
+
+// aggregatePodStats combines stats from all containers in a pod into a single entry.
+func aggregatePodStats(reports []*types.PodStatsReport) PodStatsEntry {
+	if len(reports) == 0 {
+		return PodStatsEntry{}
+	}
+
+	var entry PodStatsEntry
+	var totalCPU, totalMem float64
+	var totalMemUsage, totalMemLimit uint64
+	var totalNetIn, totalNetOut uint64
+	var totalBlockIn, totalBlockOut uint64
+	var totalPIDs uint64
+
+	for _, r := range reports {
+		// Parse CPU percentage (e.g., "75.5%" -> 75.5)
+		cpu := parsePercentage(r.CPU)
+		totalCPU += cpu
+
+		// Parse memory percentage
+		mem := parsePercentage(r.Mem)
+		totalMem += mem
+
+		// Parse memory usage bytes (e.g., "1000000 / 4000000")
+		memUsage, memLimit := parseMemoryBytes(r.MemUsageBytes)
+		totalMemUsage += memUsage
+		totalMemLimit += memLimit
+
+		// Parse network I/O (e.g., "1.5kB / 2.3kB")
+		netIn, netOut := parseIOBytes(r.NetIO)
+		totalNetIn += netIn
+		totalNetOut += netOut
+
+		// Parse block I/O
+		blockIn, blockOut := parseIOBytes(r.BlockIO)
+		totalBlockIn += blockIn
+		totalBlockOut += blockOut
+
+		// Parse PIDs
+		pids := parseUint(r.PIDS)
+		totalPIDs += pids
+
+		// Use the first report's pod info
+		if entry.PodID == "" {
+			entry.PodID = r.Pod
+			entry.PodName = r.Name
+		}
+	}
+
+	entry.CPU = totalCPU
+	entry.Memory = totalMem
+	entry.MemUsage = totalMemUsage
+	entry.MemLimit = totalMemLimit
+	entry.NetInput = totalNetIn
+	entry.NetOutput = totalNetOut
+	entry.BlockInput = totalBlockIn
+	entry.BlockOutput = totalBlockOut
+	entry.PIDs = totalPIDs
+
+	return entry
+}
+
+// parsePercentage parses a percentage string like "75.5%" into a float64.
+func parsePercentage(s string) float64 {
+	s = strings.TrimSuffix(strings.TrimSpace(s), "%")
+	var val float64
+	fmt.Sscanf(s, "%f", &val)
+	return val
+}
+
+// parseMemoryBytes parses memory usage string like "1000000 / 4000000" into usage and limit.
+func parseMemoryBytes(s string) (usage, limit uint64) {
+	parts := strings.Split(s, "/")
+	if len(parts) != 2 {
+		return 0, 0
+	}
+	usage = parseByteValue(strings.TrimSpace(parts[0]))
+	limit = parseByteValue(strings.TrimSpace(parts[1]))
+	return
+}
+
+// parseIOBytes parses I/O string like "1.5kB / 2.3kB" into input and output bytes.
+func parseIOBytes(s string) (input, output uint64) {
+	parts := strings.Split(s, "/")
+	if len(parts) != 2 {
+		return 0, 0
+	}
+	input = parseByteValue(strings.TrimSpace(parts[0]))
+	output = parseByteValue(strings.TrimSpace(parts[1]))
+	return
+}
+
+// parseByteValue parses a byte value string with optional unit (e.g., "1.5kB", "10MB", "1000000").
+func parseByteValue(s string) uint64 {
+	s = strings.TrimSpace(s)
+	if s == "" || s == "--" {
+		return 0
+	}
+
+	// Remove commas from numbers
+	s = strings.ReplaceAll(s, ",", "")
+
+	var val float64
+	var unit string
+	n, _ := fmt.Sscanf(s, "%f%s", &val, &unit)
+	if n == 0 {
+		return 0
+	}
+
+	unit = strings.ToLower(strings.TrimSpace(unit))
+	switch unit {
+	case "b", "":
+		return uint64(val)
+	case "kb", "kib":
+		return uint64(val * 1024)
+	case "mb", "mib":
+		return uint64(val * 1024 * 1024)
+	case "gb", "gib":
+		return uint64(val * 1024 * 1024 * 1024)
+	case "tb", "tib":
+		return uint64(val * 1024 * 1024 * 1024 * 1024)
+	default:
+		return uint64(val)
+	}
+}
+
+// parseUint parses a string to uint64.
+func parseUint(s string) uint64 {
+	s = strings.TrimSpace(s)
+	var val uint64
+	fmt.Sscanf(s, "%d", &val)
+	return val
+}
+
 // Events streams container runtime events.
 func (r *SocketRuntime) Events(ctx context.Context) (<-chan Event, <-chan error) {
 	eventChan := make(chan Event)

pkg/commands/runtime_test.go

@@ -196,7 +196,11 @@ func TestMockRuntimeContainerStats(t *testing.T) {
 
 	t.Run("returns error channel when not implemented", func(t *testing.T) {
 		statsChan, errChan := mock.ContainerStats(ctx, "container1", false)
-		assert.Nil(t, statsChan)
+		assert.NotNil(t, statsChan)
+
+		// Stats channel should be closed (empty)
+		_, ok := <-statsChan
+		assert.False(t, ok, "stats channel should be closed")
 
 		err := <-errChan
 		assert.Equal(t, ErrMockNotImplemented, err)
@@ -392,7 +396,11 @@ func TestMockRuntimeEvents(t *testing.T) {
 
 	t.Run("returns error when not implemented", func(t *testing.T) {
 		eventChan, errChan := mock.Events(ctx)
-		assert.Nil(t, eventChan)
+		assert.NotNil(t, eventChan)
+
+		// Events channel should be closed (empty)
+		_, ok := <-eventChan
+		assert.False(t, ok, "events channel should be closed")
 
 		err := <-errChan
 		assert.Equal(t, ErrMockNotImplemented, err)

pkg/commands/runtime_types.go

@@ -435,3 +435,19 @@ type PodSummary struct {
 	InfraID string
 	Labels  map[string]string
 }
+
+// PodStatsEntry provides runtime-agnostic pod stats.
+// This aggregates stats from all containers in a pod.
+type PodStatsEntry struct {
+	CPU         float64 // CPU percentage
+	Memory      float64 // Memory percentage
+	MemUsage    uint64  // Memory usage in bytes
+	MemLimit    uint64  // Memory limit in bytes
+	NetInput    uint64  // Network bytes received
+	NetOutput   uint64  // Network bytes sent
+	BlockInput  uint64  // Block I/O read bytes
+	BlockOutput uint64  // Block I/O write bytes
+	PIDs        uint64  // Total PIDs
+	PodID       string
+	PodName     string
+}

pkg/gui/containers_panel.go

@@ -205,10 +205,7 @@ func (gui *Gui) renderContainerListItemLogs(item *commands.ContainerListItem) ta
 
 func (gui *Gui) renderContainerListItemStats(item *commands.ContainerListItem) tasks.TaskFunc {
 	if item.IsPod {
-		return gui.NewSimpleRenderStringTask(func() string {
-			return fmt.Sprintf("Pod: %s\nStatus: %s\nContainers: %d\n\nStats not available for pods. Select a container to view stats.",
-				item.Pod.Name, item.Pod.State(), len(item.Pod.Containers))
-		})
+		return gui.renderPodStats(item.Pod)
 	}
 	return gui.renderContainerStats(item.Container)
 }
@@ -373,6 +370,28 @@ func (gui *Gui) renderContainerStats(container *commands.Container) tasks.TaskFu
 	})
 }
 
+func (gui *Gui) renderPodStats(pod *commands.Pod) tasks.TaskFunc {
+	return gui.NewTickerTask(TickerTaskOpts{
+		Func: func(ctx context.Context, notifyStopped chan struct{}) {
+			// Start monitoring if not already
+			if !pod.MonitoringStats {
+				go gui.PodmanCommand.CreatePodStatMonitor(pod)
+			}
+
+			contents, err := presentation.RenderPodStats(pod, gui.Views.Main.Width())
+			if err != nil {
+				_ = gui.createErrorPanel(err.Error())
+			}
+
+			gui.reRenderStringMain(contents)
+		},
+		Duration:   time.Second,
+		Before:     func(ctx context.Context) { gui.clearMainView() },
+		Wrap:       false,
+		Autoscroll: false,
+	})
+}
+
 func (gui *Gui) renderContainerTop(container *commands.Container) tasks.TaskFunc {
 	return gui.NewTickerTask(TickerTaskOpts{
 		Func: func(ctx context.Context, notifyStopped chan struct{}) {

pkg/gui/presentation/container_stats.go

@@ -105,6 +105,102 @@ func plotGraph(container *commands.Container, spec config.GraphConfig, width int
 	), nil
 }
 
+// RenderPodStats renders pod statistics as a string
+func RenderPodStats(pod *commands.Pod, viewWidth int) (string, error) {
+	stats, ok := pod.GetLastStats()
+	if !ok {
+		return "Collecting pod stats...", nil
+	}
+
+	s := stats.Stats
+
+	// Format stats display
+	var output strings.Builder
+
+	output.WriteString(utils.ColoredString("\nPod Statistics\n\n", color.FgCyan))
+
+	// CPU usage
+	output.WriteString(fmt.Sprintf("CPU Usage:     %.2f%%\n", s.CPU))
+
+	// Memory usage
+	memUsed := utils.FormatBinaryBytes(int(s.MemUsage))
+	memLimit := utils.FormatBinaryBytes(int(s.MemLimit))
+	output.WriteString(fmt.Sprintf("Memory Usage:  %s / %s (%.2f%%)\n", memUsed, memLimit, s.Memory))
+
+	// Network I/O
+	netIn := utils.FormatDecimalBytes(int(s.NetInput))
+	netOut := utils.FormatDecimalBytes(int(s.NetOutput))
+	output.WriteString(fmt.Sprintf("Network I/O:   %s / %s\n", netIn, netOut))
+
+	// Block I/O
+	blockIn := utils.FormatDecimalBytes(int(s.BlockInput))
+	blockOut := utils.FormatDecimalBytes(int(s.BlockOutput))
+	output.WriteString(fmt.Sprintf("Block I/O:     %s / %s\n", blockIn, blockOut))
+
+	// PIDs
+	output.WriteString(fmt.Sprintf("PIDs:          %d\n", s.PIDs))
+
+	// Render graphs if there's history
+	pod.StatsMutex.Lock()
+	historyLen := len(pod.StatHistory)
+	pod.StatsMutex.Unlock()
+
+	if historyLen > 1 {
+		output.WriteString("\n")
+
+		// CPU graph
+		cpuGraph := plotPodGraph(pod, "Stats.CPU", "CPU %", viewWidth-10, 0, 100)
+		output.WriteString(utils.ColoredString(cpuGraph, color.FgGreen))
+		output.WriteString("\n\n")
+
+		// Memory graph
+		memGraph := plotPodGraph(pod, "Stats.Memory", "Memory %", viewWidth-10, 0, 100)
+		output.WriteString(utils.ColoredString(memGraph, color.FgBlue))
+	}
+
+	return output.String(), nil
+}
+
+// plotPodGraph plots a graph for pod statistics
+func plotPodGraph(pod *commands.Pod, statPath, caption string, width int, min, max float64) string {
+	pod.StatsMutex.Lock()
+	defer pod.StatsMutex.Unlock()
+
+	if len(pod.StatHistory) == 0 {
+		return ""
+	}
+
+	data := make([]float64, len(pod.StatHistory))
+
+	for i, stats := range pod.StatHistory {
+		value, err := lookup.LookupString(stats, statPath)
+		if err != nil {
+			continue
+		}
+		floatValue, err := getFloat(value.Interface())
+		if err != nil {
+			continue
+		}
+		data[i] = floatValue
+	}
+
+	captionStr := fmt.Sprintf(
+		"%s: %0.2f (%v)",
+		caption,
+		data[len(data)-1],
+		time.Since(pod.StatHistory[0].RecordedAt).Round(time.Second),
+	)
+
+	return asciigraph.Plot(
+		data,
+		asciigraph.Height(10),
+		asciigraph.Width(width),
+		asciigraph.Min(min),
+		asciigraph.Max(max),
+		asciigraph.Caption(captionStr),
+	)
+}
+
 // from Dave C's answer at https://stackoverflow.com/questions/20767724/converting-unknown-interface-to-float64-in-golang
 func getFloat(unk interface{}) (float64, error) {
 	floatType := reflect.TypeOf(float64(0))