Add checkpoint restore metrics.

- SandboxCheckpointedMetric and SandboxRestoredMetric are added for sandbox
metadata metric which indicate whether sandbox is checkpointed or restored.
- NumCheckpointedSandboxesMetric and NumRestoredSandboxesMetric are added at
the process level which will get the count of number of sandboxes being
checkpointed and restored.

PiperOrigin-RevId: 721408284

runsc/container/container_test.go

@@ -1106,6 +1106,14 @@ func testCheckpointRestore(t *testing.T, conf *config.Config, compression statef
 		t.Fatalf("error restoring container: %v", err)
 	}
 
+	if !cont2.Sandbox.Restored {
+		t.Fatalf("sandbox returned wrong value for Sandbox.Restored, got: false, want: true")
+	}
+
+	if cont2.Sandbox.Checkpointed {
+		t.Fatalf("sandbox returned wrong value for Sandbox.Checkpointed, got: true, want: false")
+	}
+
 	// Wait until application has ran.
 	if err := waitForFileNotEmpty(outputFile2); err != nil {
 		t.Fatalf("Failed to wait for output file: %v", err)
@@ -3968,3 +3976,69 @@ func TestSpecValidationIgnore(t *testing.T) {
 		t.Fatalf("spec validation was not ignored, got: %v, want: nil", err)
 	}
 }
+
+func TestCheckpointResume(t *testing.T) {
+	for name, conf := range configs(t, true /* noOverlay */) {
+		t.Run(name, func(t *testing.T) {
+			dir, err := os.MkdirTemp(testutil.TmpDir(), "checkpoint-test")
+			if err != nil {
+				t.Fatalf("os.MkdirTemp failed: %v", err)
+			}
+			defer os.RemoveAll(dir)
+			if err := os.Chmod(dir, 0777); err != nil {
+				t.Fatalf("error chmoding file: %q, %v", dir, err)
+			}
+
+			outputPath := filepath.Join(dir, "output")
+			outputFile, err := createWriteableOutputFile(outputPath)
+			if err != nil {
+				t.Fatalf("error creating output file: %v", err)
+			}
+			defer outputFile.Close()
+
+			script := fmt.Sprintf("i=0; while true; do echo $i >> %q; sleep 1; i=$((i+1)); done", outputPath)
+			spec := testutil.NewSpecWithArgs("bash", "-c", script)
+			_, bundleDir, cleanup, err := testutil.SetupContainer(spec, conf)
+			if err != nil {
+				t.Fatalf("error setting up container: %v", err)
+			}
+			defer cleanup()
+
+			// Create and start the container.
+			args := Args{
+				ID:        testutil.RandomContainerID(),
+				Spec:      spec,
+				BundleDir: bundleDir,
+			}
+			cont, err := New(conf, args)
+			if err != nil {
+				t.Fatalf("error creating container: %v", err)
+			}
+			if err := cont.Start(conf); err != nil {
+				t.Fatalf("error starting container: %v", err)
+			}
+
+			// Wait until application has ran.
+			if err := waitForFileNotEmpty(outputFile); err != nil {
+				t.Fatalf("Failed to wait for output file: %v", err)
+			}
+
+			sfOpts := statefile.Options{
+				Resume: true,
+			}
+			// Checkpoint running container; save state into new file.
+			if err := cont.Checkpoint(dir, false /* direct */, sfOpts, pgalloc.SaveOpts{}); err != nil {
+				t.Fatalf("error checkpointing container to empty file: %v", err)
+			}
+
+			if !cont.Sandbox.Checkpointed {
+				t.Fatalf("sandbox returned wrong value for Sandbox.Checkpointed, got: false, want: true")
+			}
+
+			if cont.Sandbox.Restored {
+				t.Fatalf("sandbox returned wrong value for Sandbox.Restored, got: true, want: false")
+			}
+			cont.Destroy()
+		})
+	}
+}

runsc/metricserver/metricserver.go

@@ -531,9 +531,11 @@ func (m *metricServer) loadSandboxesLocked(ctx context.Context) []sandboxLoadRes
 // metric data (if querying metrics from the sandbox process succeeded).
 type sandboxMetricsResult struct {
 	sandboxLoadResult
-	isRunning bool
-	snapshot  *prometheus.Snapshot
-	err       error
+	isRunning      bool
+	isCheckpointed bool
+	isRestored     bool
+	snapshot       *prometheus.Snapshot
+	err            error
 }
 
 // queryMultiSandboxMetrics queries metric data from multiple loaded sandboxes.
@@ -570,17 +572,23 @@ func queryMultiSandboxMetrics(ctx context.Context, loadedSandboxes []sandboxLoad
 			defer wg.Done()
 			for s := range loadedSandboxCh {
 				isRunning := false
+				isCheckpointed := false
+				isRestored := false
 				var snapshot *prometheus.Snapshot
 				err := s.err
 				if err == nil {
 					queryCtx, queryCtxCancel := context.WithTimeout(ctx, perSandboxTime)
 					snapshot, err = querySandboxMetrics(queryCtx, s.sandbox, s.verifier, metricsFilter)
 					queryCtxCancel()
 					isRunning = s.sandbox.IsRunning()
+					isCheckpointed = s.sandbox.Checkpointed
+					isRestored = s.sandbox.Restored
 				}
 				processSandbox(sandboxMetricsResult{
 					sandboxLoadResult: s,
 					isRunning:         isRunning,
+					isCheckpointed:    isCheckpointed,
+					isRestored:        isRestored,
 					snapshot:          snapshot,
 					err:               err,
 				})
@@ -660,6 +668,8 @@ func (m *metricServer) serveMetrics(w *httpResponseWriter, req *http.Request) ht
 	type metaMetrics struct {
 		numRunningSandboxes      int64
 		numCannotExportSandboxes int64
+		numCheckpointedSandboxes int64
+		numRestoredSandboxes     int64
 	}
 	meta := metaMetrics{}                   // Protected by metricsMu.
 	selfMetrics := prometheus.NewSnapshot() // Protected by metricsMu.
@@ -675,11 +685,23 @@ func (m *metricServer) serveMetrics(w *httpResponseWriter, req *http.Request) ht
 		defer metricsMu.Unlock()
 		selfMetrics.Add(prometheus.LabeledIntData(&SandboxPresenceMetric, nil, 1).SetExternalLabels(r.served.extraLabels))
 		sandboxRunning := int64(0)
+		sandboxCheckpointed := int64(0)
+		sandboxRestored := int64(0)
 		if r.isRunning {
 			sandboxRunning = 1
 			meta.numRunningSandboxes++
 		}
+		if r.isCheckpointed {
+			sandboxCheckpointed = 1
+			meta.numCheckpointedSandboxes++
+		}
+		if r.isRestored {
+			sandboxRestored = 1
+			meta.numRestoredSandboxes++
+		}
 		selfMetrics.Add(prometheus.LabeledIntData(&SandboxRunningMetric, nil, sandboxRunning).SetExternalLabels(r.served.extraLabels))
+		selfMetrics.Add(prometheus.LabeledIntData(&SandboxCheckpointedMetric, nil, sandboxCheckpointed).SetExternalLabels(r.served.extraLabels))
+		selfMetrics.Add(prometheus.LabeledIntData(&SandboxRestoredMetric, nil, sandboxRestored).SetExternalLabels(r.served.extraLabels))
 		if r.err == nil {
 			selfMetrics.Add(prometheus.LabeledIntData(&SandboxMetadataMetric, r.sandbox.MetricMetadata, 1).SetExternalLabels(r.served.extraLabels))
 			for _, cap := range r.served.capabilities {
@@ -732,6 +754,8 @@ func (m *metricServer) serveMetrics(w *httpResponseWriter, req *http.Request) ht
 	selfMetrics.Add(prometheus.NewIntData(&NumRunningSandboxesMetric, meta.numRunningSandboxes))
 	selfMetrics.Add(prometheus.NewIntData(&NumCannotExportSandboxesMetric, meta.numCannotExportSandboxes))
 	selfMetrics.Add(prometheus.NewIntData(&NumTotalSandboxesMetric, numSandboxesTotal))
+	selfMetrics.Add(prometheus.NewIntData(&NumCheckpointedSandboxesMetric, meta.numCheckpointedSandboxes))
+	selfMetrics.Add(prometheus.NewIntData(&NumRestoredSandboxesMetric, meta.numRestoredSandboxes))
 
 	// Write out all data.
 	lastMetricsWrittenSize := int(m.lastMetricsWrittenSize.Load())

runsc/metricserver/metricserver_metrics.go

@@ -30,6 +30,16 @@ var (
 		Type: prometheus.TypeGauge,
 		Help: "Boolean metric set to 1 for each running sandbox.",
 	}
+	SandboxCheckpointedMetric = prometheus.Metric{
+		Name: "sandbox_checkpointed",
+		Type: prometheus.TypeGauge,
+		Help: "Boolean metric set to 1 for each checkpointed sandbox.",
+	}
+	SandboxRestoredMetric = prometheus.Metric{
+		Name: "sandbox_restored",
+		Type: prometheus.TypeGauge,
+		Help: "Boolean metric set to 1 for each restored sandbox.",
+	}
 	SandboxMetadataMetric = prometheus.Metric{
 		Name: "sandbox_metadata",
 		Type: prometheus.TypeGauge,
@@ -66,6 +76,16 @@ var (
 		Type: prometheus.TypeCounter,
 		Help: "Counter of sandboxes that have ever been started.",
 	}
+	NumCheckpointedSandboxesMetric = prometheus.Metric{
+		Name: "num_sandboxes_checkpointed",
+		Type: prometheus.TypeCounter,
+		Help: "Counter of sandboxes that have been checkpointed.",
+	}
+	NumRestoredSandboxesMetric = prometheus.Metric{
+		Name: "num_sandboxes_restored",
+		Type: prometheus.TypeCounter,
+		Help: "Counter of sandboxes that have been restored.",
+	}
 )
 
 // Metrics is a list of metrics that the metric server generates.
@@ -79,5 +99,7 @@ var Metrics = []*prometheus.Metric{
 	&NumRunningSandboxesMetric,
 	&NumCannotExportSandboxesMetric,
 	&NumTotalSandboxesMetric,
+	&NumCheckpointedSandboxesMetric,
+	&NumRestoredSandboxesMetric,
 	&prometheus.ProcessStartTimeSeconds,
 }

runsc/sandbox/sandbox.go

@@ -219,6 +219,12 @@ type Sandbox struct {
 	// threads to wait on sandbox and get the exit code, since Linux will return
 	// WaitStatus to one of the waiters only.
 	status unix.WaitStatus `nojson:"true"`
+
+	// Checkpointed will be true when the sandbox has been checkpointed.
+	Checkpointed bool `json:"checkpointed"`
+
+	// Restored will be true when the sandbox has been restored.
+	Restored bool `json:"restored"`
 }
 
 // Getpid returns the process ID of the sandbox process.
@@ -537,7 +543,7 @@ func (s *Sandbox) Restore(conf *config.Config, cid string, imagePath string, dir
 	if err := conn.Call(boot.ContMgrRestore, &opt, nil); err != nil {
 		return fmt.Errorf("restoring container %q: %v", cid, err)
 	}
-
+	s.Restored = true
 	return nil
 }
 
@@ -1439,6 +1445,7 @@ func (s *Sandbox) Checkpoint(cid string, imagePath string, direct bool, sfOpts s
 	if err := s.call(boot.ContMgrCheckpoint, &opt, nil); err != nil {
 		return fmt.Errorf("checkpointing container %q: %w", cid, err)
 	}
+	s.Checkpointed = true
 	return nil
 }