Add pod level metric collection for Windows

This PR defines code structure for metric provider which works on Windows.

### Changelog
1. Changed receiver.go in awscontainerinsights to run for Windows with metric provider.
2. Added summary API in kubeletclient
3. Add kubeletProvider to return metrics at different levels i.e. pod, contianer, node.
4. Updated hostInfo providers to run for Windows.
5. Updated ebsVolume Info provider to run for Windows.

## Todos:
1. Define correct ebsVolume Info provider for Windows
2. Change logic around k8s leader election to run for Windows

receiver/awscontainerinsightreceiver/internal/cadvisor/extractors/cpu_extractor.go

@@ -33,7 +33,7 @@ func (c *CPUMetricExtractor) GetValue(info *cInfo.ContainerInfo, mInfo CPUMemInf
 
 	// When there is more than one stats point, always use the last one
 	curStats := GetStats(info)
-	metric := newCadvisorMetric(containerType, c.logger)
+	metric := NewCadvisorMetric(containerType, c.logger)
 	metric.cgroupPath = info.Name
 	multiplier := float64(decimalToMillicores)
 	assignRateValueToField(&c.rateCalculator, metric.fields, ci.MetricName(containerType, ci.CPUTotal), info.Name, float64(curStats.Cpu.Usage.Total), curStats.Timestamp, multiplier)

receiver/awscontainerinsightreceiver/internal/cadvisor/extractors/diskio_extractor.go

@@ -41,7 +41,7 @@ func (d *DiskIOMetricExtractor) extractIoMetrics(curStatsSet []cInfo.PerDiskStat
 	expectedKey := []string{ci.DiskIOAsync, ci.DiskIOSync, ci.DiskIORead, ci.DiskIOWrite, ci.DiskIOTotal}
 	for _, cur := range curStatsSet {
 		curDevName := devName(cur)
-		metric := newCadvisorMetric(getDiskIOMetricType(containerType, d.logger), d.logger)
+		metric := NewCadvisorMetric(getDiskIOMetricType(containerType, d.logger), d.logger)
 		metric.tags[ci.DiskDev] = curDevName
 		for _, key := range expectedKey {
 			if curVal, curOk := cur.Stats[key]; curOk {

receiver/awscontainerinsightreceiver/internal/cadvisor/extractors/extractor.go

@@ -44,7 +44,7 @@ type CAdvisorMetric struct {
 	logger *zap.Logger
 }
 
-func newCadvisorMetric(mType string, logger *zap.Logger) *CAdvisorMetric {
+func NewCadvisorMetric(mType string, logger *zap.Logger) *CAdvisorMetric {
 	metric := &CAdvisorMetric{
 		fields: make(map[string]any),
 		tags:   make(map[string]string),

receiver/awscontainerinsightreceiver/internal/cadvisor/extractors/fs_extractor.go

@@ -33,7 +33,7 @@ func (f *FileSystemMetricExtractor) GetValue(info *cinfo.ContainerInfo, _ CPUMem
 	metrics := make([]*CAdvisorMetric, 0, len(stats.Filesystem))
 
 	for _, v := range stats.Filesystem {
-		metric := newCadvisorMetric(containerType, f.logger)
+		metric := NewCadvisorMetric(containerType, f.logger)
 		if v.Device == "" {
 			continue
 		}

receiver/awscontainerinsightreceiver/internal/cadvisor/extractors/mem_extractor.go

@@ -28,7 +28,7 @@ func (m *MemMetricExtractor) GetValue(info *cinfo.ContainerInfo, mInfo CPUMemInf
 		return metrics
 	}
 
-	metric := newCadvisorMetric(containerType, m.logger)
+	metric := NewCadvisorMetric(containerType, m.logger)
 	metric.cgroupPath = info.Name
 	curStats := GetStats(info)
 

receiver/awscontainerinsightreceiver/internal/cadvisor/extractors/net_extractor.go

@@ -70,7 +70,7 @@ func (n *NetMetricExtractor) GetValue(info *cinfo.ContainerInfo, _ CPUMemInfoPro
 
 		netIfceMetrics[i] = netIfceMetric
 
-		metric := newCadvisorMetric(mType, n.logger)
+		metric := NewCadvisorMetric(mType, n.logger)
 		metric.tags[ci.NetIfce] = cur.Name
 		for k, v := range netIfceMetric {
 			metric.fields[ci.MetricName(mType, k)] = v
@@ -81,7 +81,7 @@ func (n *NetMetricExtractor) GetValue(info *cinfo.ContainerInfo, _ CPUMemInfoPro
 
 	aggregatedFields := ci.SumFields(netIfceMetrics)
 	if len(aggregatedFields) > 0 {
-		metric := newCadvisorMetric(containerType, n.logger)
+		metric := NewCadvisorMetric(containerType, n.logger)
 		for k, v := range aggregatedFields {
 			metric.fields[ci.MetricName(containerType, k)] = v
 		}

receiver/awscontainerinsightreceiver/internal/host/ebsvolume.go

@@ -10,6 +10,7 @@ import (
 	"os"
 	"path/filepath"
 	"regexp"
+	"runtime"
 	"strings"
 	"sync"
 	"time"
@@ -141,6 +142,12 @@ func (e *ebsVolume) addEBSVolumeMapping(zone *string, attachement *ec2.VolumeAtt
 func (e *ebsVolume) findNvmeBlockNameIfPresent(devName string) string {
 	// for nvme(ssd), there is a symlink from devName to nvme block name, i.e. /dev/xvda -> /dev/nvme0n1
 	// https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/nvme-ebs-volumes.html
+
+	// Windows does not support file system eg: /rootfs to get Nvme Block name.
+	// todo: Implement logic to identify Nvme devices on Windows. Refer https://docs.aws.amazon.com/AWSEC2/latest/WindowsGuide/nvme-ebs-volumes.html#identify-nvme-ebs-device
+	if runtime.GOOS == "windows" {
+		return ""
+	}
 	hasRootFs := true
 	if _, err := e.osLstat(hostProc); os.IsNotExist(err) {
 		hasRootFs = false

receiver/awscontainerinsightreceiver/internal/host/nodeCapacity.go

@@ -6,6 +6,7 @@ package host // import "github.com/open-telemetry/opentelemetry-collector-contri
 import (
 	"context"
 	"os"
+	"runtime"
 
 	"github.com/shirou/gopsutil/v3/common"
 	"github.com/shirou/gopsutil/v3/cpu"
@@ -46,11 +47,14 @@ func newNodeCapacity(logger *zap.Logger, options ...nodeCapacityOption) (nodeCap
 		opt(nc)
 	}
 
-	if _, err := nc.osLstat(hostProc); os.IsNotExist(err) {
-		return nil, err
+	ctx := context.Background()
+	if runtime.GOOS != "windows" {
+		if _, err := nc.osLstat(hostProc); os.IsNotExist(err) {
+			return nil, err
+		}
+		envMap := common.EnvMap{common.HostProcEnvKey: hostProc}
+		ctx = context.WithValue(ctx, common.EnvKey, envMap)
 	}
-	envMap := common.EnvMap{common.HostProcEnvKey: hostProc}
-	ctx := context.WithValue(context.Background(), common.EnvKey, envMap)
 
 	nc.parseCPU(ctx)
 	nc.parseMemory(ctx)

receiver/awscontainerinsightreceiver/internal/host/utilconst_windows.go

@@ -0,0 +1,14 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+//go:build !linux
+// +build !linux
+
+package host
+
+// These variables are invalid for Windows
+const (
+	rootfs     = ""
+	hostProc   = rootfs + ""
+	hostMounts = hostProc + ""
+)

receiver/awscontainerinsightreceiver/internal/host/utils.go

@@ -10,12 +10,6 @@ import (
 	"time"
 )
 
-const (
-	rootfs     = "/rootfs"            // the root directory "/" is mounted as "/rootfs" in container
-	hostProc   = rootfs + "/proc"     // "/rootfs/proc" in container refers to the host proc directory "/proc"
-	hostMounts = hostProc + "/mounts" // "/rootfs/proc/mounts" in container refers to "/proc/mounts" in the host
-)
-
 func hostJitter(max time.Duration) time.Duration {
 	hostName, err := os.Hostname()
 	if err != nil {

receiver/awscontainerinsightreceiver/internal/host/utilsconst.go

@@ -0,0 +1,13 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+//go:build !windows
+// +build !windows
+
+package host
+
+const (
+	rootfs     = "/rootfs"            // the root directory "/" is mounted as "/rootfs" in container
+	hostProc   = rootfs + "/proc"     // "/rootfs/proc" in container refers to the host proc directory "/proc"
+	hostMounts = hostProc + "/mounts" // "/rootfs/proc/mounts" in container refers to "/proc/mounts" in the host
+)

receiver/awscontainerinsightreceiver/internal/k8swindows/k8swindows.go

@@ -0,0 +1,111 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+//go:build windows
+// +build windows
+
+package k8swindows
+
+import (
+	"context"
+	"errors"
+	"os"
+
+	ci "github.com/open-telemetry/opentelemetry-collector-contrib/internal/aws/containerinsight"
+	"github.com/open-telemetry/opentelemetry-collector-contrib/receiver/awscontainerinsightreceiver/internal/cadvisor/extractors"
+	"github.com/open-telemetry/opentelemetry-collector-contrib/receiver/awscontainerinsightreceiver/internal/host"
+	"github.com/open-telemetry/opentelemetry-collector-contrib/receiver/awscontainerinsightreceiver/internal/stores"
+
+	"go.opentelemetry.io/collector/pdata/pmetric"
+	"go.uber.org/zap"
+)
+
+type K8sWindows struct {
+	cancel          context.CancelFunc
+	logger          *zap.Logger
+	nodeName        string `toml:"node_name"`
+	k8sDecorator    stores.K8sDecorator
+	summaryProvider *kubeletSummaryProvider
+	hostInfo        host.Info
+}
+
+func New(logger *zap.Logger, decorator *stores.K8sDecorator, hostInfo host.Info) (*K8sWindows, error) {
+	nodeName := os.Getenv("HOST_NAME")
+	if nodeName == "" {
+		return nil, errors.New("missing environment variable HOST_NAME. Please check your deployment YAML config")
+	}
+	k8sSummaryProvider, err := new(logger, hostInfo)
+	if err != nil {
+		logger.Error("failed to initialize kubelet summary provider, ", zap.Error(err))
+		return nil, err
+	}
+	return &K8sWindows{
+		logger:          logger,
+		nodeName:        nodeName,
+		k8sDecorator:    *decorator,
+		summaryProvider: k8sSummaryProvider,
+		hostInfo:        hostInfo,
+	}, nil
+}
+
+func (k *K8sWindows) GetMetrics() []pmetric.Metrics {
+	k.logger.Debug("D! called K8sWindows GetMetrics")
+	var result []pmetric.Metrics
+
+	metrics, err := k.summaryProvider.getMetrics()
+	if err != nil {
+		k.logger.Error("error getting metrics from kubelet summary provider, ", zap.Error(err))
+		return result
+	}
+	metrics = k.decorateMetrics(metrics)
+	for _, k8sSummaryMetric := range metrics {
+		md := ci.ConvertToOTLPMetrics(k8sSummaryMetric.GetFields(), k8sSummaryMetric.GetTags(), k.logger)
+		result = append(result, md)
+	}
+
+	return result
+}
+
+func (c *K8sWindows) decorateMetrics(cadvisormetrics []*extractors.CAdvisorMetric) []*extractors.CAdvisorMetric {
+	//ebsVolumeIdsUsedAsPV := c.hostInfo.ExtractEbsIDsUsedByKubernetes()
+	var result []*extractors.CAdvisorMetric
+	for _, m := range cadvisormetrics {
+		tags := m.GetTags()
+		//c.addEbsVolumeInfo(tags, ebsVolumeIdsUsedAsPV)
+
+		// add version
+		//tags[ci.Version] = c.version
+
+		// add nodeName for node, pod and container
+		metricType := tags[ci.MetricType]
+		if c.nodeName != "" && (ci.IsNode(metricType) || ci.IsInstance(metricType) ||
+			ci.IsPod(metricType) || ci.IsContainer(metricType)) {
+			tags[ci.NodeNameKey] = c.nodeName
+		}
+
+		// add instance id and type
+		if instanceID := c.hostInfo.GetInstanceID(); instanceID != "" {
+			tags[ci.InstanceID] = instanceID
+		}
+		if instanceType := c.hostInfo.GetInstanceType(); instanceType != "" {
+			tags[ci.InstanceType] = instanceType
+		}
+
+		// add scaling group name
+		tags[ci.AutoScalingGroupNameKey] = c.hostInfo.GetAutoScalingGroupName()
+
+		// add tags for EKS
+		tags[ci.ClusterNameKey] = c.hostInfo.GetClusterName()
+
+		out := c.k8sDecorator.Decorate(m)
+		if out != nil {
+			result = append(result, out)
+		}
+	}
+	return result
+}
+
+func (k *K8sWindows) Shutdown() error {
+	k.logger.Debug("D! called K8sWindows Shutdown")
+	return nil
+}

receiver/awscontainerinsightreceiver/internal/k8swindows/k8swindows_nowindows.go

@@ -0,0 +1,32 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+//go:build !windows
+// +build !windows
+
+package k8swindows
+
+import (
+	"github.com/open-telemetry/opentelemetry-collector-contrib/receiver/awscontainerinsightreceiver/internal/host"
+	"github.com/open-telemetry/opentelemetry-collector-contrib/receiver/awscontainerinsightreceiver/internal/stores"
+
+	"go.opentelemetry.io/collector/pdata/pmetric"
+	"go.uber.org/zap"
+)
+
+type K8sWindows struct {
+}
+
+// New is a dummy function to construct a dummy K8sWindows struct for linux
+func New(_ *zap.Logger, _ *stores.K8sDecorator, _ host.Info) (*K8sWindows, error) {
+	return &K8sWindows{}, nil
+}
+
+// GetMetrics is a dummy function to always returns empty metrics for linux
+func (k *K8sWindows) GetMetrics() []pmetric.Metrics {
+	return []pmetric.Metrics{}
+}
+
+func (k *K8sWindows) Shutdown() error {
+	return nil
+}

receiver/awscontainerinsightreceiver/internal/k8swindows/kubelet.go

@@ -0,0 +1,93 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+//go:build windows
+// +build windows
+
+package k8swindows
+
+import (
+	"fmt"
+	"os"
+
+	ci "github.com/open-telemetry/opentelemetry-collector-contrib/internal/aws/containerinsight"
+	"github.com/open-telemetry/opentelemetry-collector-contrib/receiver/awscontainerinsightreceiver/internal/cadvisor/extractors"
+	"github.com/open-telemetry/opentelemetry-collector-contrib/receiver/awscontainerinsightreceiver/internal/host"
+	"github.com/open-telemetry/opentelemetry-collector-contrib/receiver/awscontainerinsightreceiver/internal/stores/kubeletutil"
+
+	"go.uber.org/zap"
+	stats "k8s.io/kubelet/pkg/apis/stats/v1alpha1"
+)
+
+type kubeletSummaryProvider struct {
+	logger   *zap.Logger
+	hostIP   string
+	hostPort string
+	client   *kubeletutil.KubeletClient
+	hostInfo host.Info
+}
+
+func new(logger *zap.Logger, info host.Info) (*kubeletSummaryProvider, error) {
+	hostIP := os.Getenv("HOST_IP")
+	kclient, err := kubeletutil.NewKubeletClient(hostIP, ci.KubeSecurePort, logger)
+	if err != nil {
+		return nil, fmt.Errorf("failed to initialize kubelet client: %w", err)
+	}
+	return &kubeletSummaryProvider{
+		logger:   logger,
+		client:   kclient,
+		hostInfo: info,
+	}, nil
+}
+
+func (k *kubeletSummaryProvider) getMetrics() ([]*extractors.CAdvisorMetric, error) {
+	summary, err := k.client.Summary(k.logger)
+	if err != nil {
+		k.logger.Error("kubelet summary API failed, ", zap.Error(err))
+		return nil, err
+	}
+
+	return k.getPodMetrics(summary)
+}
+
+func (k *kubeletSummaryProvider) getContainerMetrics(summary *stats.Summary) ([]*extractors.CAdvisorMetric, error) {
+	var metrics []*extractors.CAdvisorMetric
+	// todo: implement CPU, memory metrics from containers
+	return metrics, nil
+}
+
+func (k *kubeletSummaryProvider) getPodMetrics(summary *stats.Summary) ([]*extractors.CAdvisorMetric, error) {
+	// todo: This is not complete implementation of pod level metric collection since network level metrics are pending
+	// May need to add some more pod level labels for store decorators to work properly
+
+	var metrics []*extractors.CAdvisorMetric
+
+	nodeCPUCores := k.hostInfo.GetNumCores()
+	for _, pod := range summary.Pods {
+		k.logger.Info(fmt.Sprintf("pod summary %v", pod.PodRef.Name))
+		metric := extractors.NewCadvisorMetric(ci.TypePod, k.logger)
+
+		metric.AddField(ci.PodIDKey, pod.PodRef.UID)
+		metric.AddField(ci.K8sPodNameKey, pod.PodRef.Name)
+		metric.AddField(ci.K8sNamespace, pod.PodRef.Namespace)
+
+		// CPU metric
+		metric.AddField(ci.MetricName(ci.TypePod, ci.CPUTotal), *pod.CPU.UsageCoreNanoSeconds)
+		metric.AddField(ci.MetricName(ci.TypePod, ci.CPUUtilization), float64(*pod.CPU.UsageCoreNanoSeconds)/float64(nodeCPUCores))
+
+		// Memory metrics
+		metric.AddField(ci.MetricName(ci.TypePod, ci.MemUsage), *pod.Memory.UsageBytes)
+		metric.AddField(ci.MetricName(ci.TypePod, ci.MemRss), *pod.Memory.RSSBytes)
+		metric.AddField(ci.MetricName(ci.TypePod, ci.MemWorkingset), *pod.Memory.WorkingSetBytes)
+		metric.AddField(ci.MetricName(ci.TypePod, ci.MemReservedCapacity), k.hostInfo.GetMemoryCapacity())
+		metric.AddField(ci.MetricName(ci.TypePod, ci.MemUtilization), float64(*pod.Memory.WorkingSetBytes)/float64(k.hostInfo.GetMemoryCapacity())*100)
+		metrics = append(metrics, metric)
+	}
+	return metrics, nil
+}
+
+func (k *kubeletSummaryProvider) getNodeMetrics() ([]*extractors.CAdvisorMetric, error) {
+	var metrics []*extractors.CAdvisorMetric
+	//todo: Implement CPU, memory and network metrics at node
+	return metrics, nil
+}