structers

type Backend struct {
	// URL is the network address of the back-end container.
	URL *url.URL

	// Alive indicates whether the back-end is currently healthy and reachable.
	Alive bool

	// Ill indicates if a container is having problems responding to a check or a request, which might cause lost requests.
	Ill bool

	// CurrentLoad tracks the number of active requests or load metric.
	CurrentLoad int64

	//
	ShuttingDown int32

	// HeapIdx is the index of this backend entry in the heap, used for reordering.
	HeapIdx int

	// ContainerID is the unique identifier assigned by Docker or the container runtime.
	ContainerID string

	// Mutex guards concurrent access to fields like Alive and CurrentLoad.
	Mutex sync.RWMutex

	// StartTime save the time of initialization of a container,
	// used to give a warm up phase to an api to start up
	StartTime time.Time
}

type BackendHeap []*Backend

type BlkioStatEntry struct {
	Major uint64 `json:"major"`
	Minor uint64 `json:"minor"`
	Op    string `json:"op"`
	Value uint64 `json:"value"`
}

type BlkioStats struct {
	// number of bytes transferred to and from the block device
	IoServiceBytesRecursive []BlkioStatEntry `json:"io_service_bytes_recursive"`
	IoServicedRecursive     []BlkioStatEntry `json:"io_serviced_recursive"`
	IoQueuedRecursive       []BlkioStatEntry `json:"io_queue_recursive"`
	IoServiceTimeRecursive  []BlkioStatEntry `json:"io_service_time_recursive"`
	IoWaitTimeRecursive     []BlkioStatEntry `json:"io_wait_time_recursive"`
	IoMergedRecursive       []BlkioStatEntry `json:"io_merged_recursive"`
	IoTimeRecursive         []BlkioStatEntry `json:"io_time_recursive"`
	SectorsRecursive        []BlkioStatEntry `json:"sectors_recursive"`
}

type CPUStats struct {
	// CPU Usage. Linux and Windows.
	CPUUsage CPUUsage `json:"cpu_usage"`

	// System Usage. Linux only.
	SystemUsage uint64 `json:"system_cpu_usage,omitempty"`

	// Online CPUs. Linux only.
	OnlineCPUs uint32 `json:"online_cpus,omitempty"`

	// Throttling Data. Linux only.
	ThrottlingData ThrottlingData `json:"throttling_data,omitempty"`
}

type CPUUsage struct {
	// Total CPU time consumed.
	// Units: nanoseconds (Linux)
	// Units: 100's of nanoseconds (Windows)
	TotalUsage uint64 `json:"total_usage"`

	// Total CPU time consumed per core (Linux). Not used on Windows.
	// Units: nanoseconds.
	PercpuUsage []uint64 `json:"percpu_usage,omitempty"`

	// Time spent by tasks of the cgroup in kernel mode (Linux).
	// Time spent by all container processes in kernel mode (Windows).
	// Units: nanoseconds (Linux).
	// Units: 100's of nanoseconds (Windows). Not populated for Hyper-V Containers.
	UsageInKernelmode uint64 `json:"usage_in_kernelmode"`

	// Time spent by tasks of the cgroup in user mode (Linux).
	// Time spent by all container processes in user mode (Windows).
	// Units: nanoseconds (Linux).
	// Units: 100's of nanoseconds (Windows). Not populated for Hyper-V Containers
	UsageInUsermode uint64 `json:"usage_in_usermode"`
}

type MemoryStats struct {

	// current res_counter usage for memory
	Usage uint64 `json:"usage,omitempty"`
	// maximum usage ever recorded.
	MaxUsage uint64 `json:"max_usage,omitempty"`
	// TODO(vishh): Export these as stronger types.
	// all the stats exported via memory.stat.
	Stats map[string]uint64 `json:"stats,omitempty"`
	// number of times memory usage hits limits.
	Failcnt uint64 `json:"failcnt,omitempty"`
	Limit   uint64 `json:"limit,omitempty"`

	// committed bytes
	Commit uint64 `json:"commitbytes,omitempty"`
	// peak committed bytes
	CommitPeak uint64 `json:"commitpeakbytes,omitempty"`
	// private working set
	PrivateWorkingSet uint64 `json:"privateworkingset,omitempty"`
}

type NetworkStats struct {
	// Bytes received. Windows and Linux.
	RxBytes uint64 `json:"rx_bytes"`
	// Packets received. Windows and Linux.
	RxPackets uint64 `json:"rx_packets"`
	// Received errors. Not used on Windows. Note that we dont `omitempty` this
	// field as it is expected in the >=v1.21 API stats structure.
	RxErrors uint64 `json:"rx_errors"`
	// Incoming packets dropped. Windows and Linux.
	RxDropped uint64 `json:"rx_dropped"`
	// Bytes sent. Windows and Linux.
	TxBytes uint64 `json:"tx_bytes"`
	// Packets sent. Windows and Linux.
	TxPackets uint64 `json:"tx_packets"`
	// Sent errors. Not used on Windows. Note that we dont `omitempty` this
	// field as it is expected in the >=v1.21 API stats structure.
	TxErrors uint64 `json:"tx_errors"`
	// Outgoing packets dropped. Windows and Linux.
	TxDropped uint64 `json:"tx_dropped"`
	// Endpoint ID. Not used on Linux.
	EndpointID string `json:"endpoint_id,omitempty"`
	// Instance ID. Not used on Linux.
	InstanceID string `json:"instance_id,omitempty"`
}

type PidsStats struct {
	// Current is the number of pids in the cgroup
	Current uint64 `json:"current,omitempty"`
	// Limit is the hard limit on the number of pids in the cgroup.
	// A "Limit" of 0 means that there is no limit.
	Limit uint64 `json:"limit,omitempty"`
}

type ReplicaStats struct {
	CPUPercent    float64 // CPU usage %
	MemoryUsage   uint64  // Memory used in bytes
	MemoryLimit   uint64  // Memory limit in bytes
	MemoryPercent float64 // Memory usage %
}

type Stats struct {
	// Common stats
	Read    time.Time `json:"read"`
	PreRead time.Time `json:"preread"`

	// Linux specific stats, not populated on Windows.
	PidsStats  PidsStats  `json:"pids_stats,omitempty"`
	BlkioStats BlkioStats `json:"blkio_stats,omitempty"`

	// Windows specific stats, not populated on Linux.
	NumProcs     uint32       `json:"num_procs"`
	StorageStats StorageStats `json:"storage_stats,omitempty"`

	// Shared stats
	CPUStats    CPUStats    `json:"cpu_stats,omitempty"`
	PreCPUStats CPUStats    `json:"precpu_stats,omitempty"` // "Pre"="Previous"
	MemoryStats MemoryStats `json:"memory_stats,omitempty"`
}

type StatsJSON struct {
	Stats

	Name string `json:"name,omitempty"`
	ID   string `json:"id,omitempty"`

	// Networks request version >=1.21
	Networks map[string]NetworkStats `json:"networks,omitempty"`
}

type StorageStats struct {
	ReadCountNormalized  uint64 `json:"read_count_normalized,omitempty"`
	ReadSizeBytes        uint64 `json:"read_size_bytes,omitempty"`
	WriteCountNormalized uint64 `json:"write_count_normalized,omitempty"`
	WriteSizeBytes       uint64 `json:"write_size_bytes,omitempty"`
}

type ThrottlingData struct {
	// Number of periods with throttling active
	Periods uint64 `json:"periods"`
	// Number of periods when the container hits its throttling limit.
	ThrottledPeriods uint64 `json:"throttled_periods"`
	// Aggregate time the container was throttled for in nanoseconds.
	ThrottledTime uint64 `json:"throttled_time"`
}