var AllMetrics = MetricSet{
	CpuUsageMetrics:                struct{}{},
	ProcessSchedulerMetrics:        struct{}{},
	PerCpuUsageMetrics:             struct{}{},
	MemoryUsageMetrics:             struct{}{},
	MemoryNumaMetrics:              struct{}{},
	CpuLoadMetrics:                 struct{}{},
	DiskIOMetrics:                  struct{}{},
	DiskUsageMetrics:               struct{}{},
	NetworkUsageMetrics:            struct{}{},
	NetworkTcpUsageMetrics:         struct{}{},
	NetworkAdvancedTcpUsageMetrics: struct{}{},
	NetworkUdpUsageMetrics:         struct{}{},
	ProcessMetrics:                 struct{}{},
	AppMetrics:                     struct{}{},
	HugetlbUsageMetrics:            struct{}{},
	PerfMetrics:                    struct{}{},
	ReferencedMemoryMetrics:        struct{}{},
	CPUTopologyMetrics:             struct{}{},
	ResctrlMetrics:                 struct{}{},
	CPUSetMetrics:                  struct{}{},
	OOMMetrics:                     struct{}{},
	PressureMetrics:                struct{}{},
}

var AllNetworkMetrics = MetricSet{
	NetworkUsageMetrics:            struct{}{},
	NetworkTcpUsageMetrics:         struct{}{},
	NetworkAdvancedTcpUsageMetrics: struct{}{},
	NetworkUdpUsageMetrics:         struct{}{},
}

type ContainerHandler interface {
	// Returns the ContainerReference
	ContainerReference() (info.ContainerReference, error)

	// Returns container's isolation spec.
	GetSpec() (info.ContainerSpec, error)

	// Returns the current stats values of the container.
	GetStats() (*info.ContainerStats, error)

	// Returns the subcontainers of this container.
	ListContainers(listType ListType) ([]info.ContainerReference, error)

	// Returns the processes inside this container.
	ListProcesses(listType ListType) ([]int, error)

	// Returns absolute cgroup path for the requested resource.
	GetCgroupPath(resource string) (string, error)

	// Returns container labels, if available.
	GetContainerLabels() map[string]string

	// Returns the container's ip address, if available
	GetContainerIPAddress() string

	// Returns whether the container still exists.
	Exists() bool

	// Cleanup frees up any resources being held like fds or go routines, etc.
	Cleanup()

	// Start starts any necessary background goroutines - must be cleaned up in Cleanup().
	// It is expected that most implementations will be a no-op.
	Start()

	// Type of handler
	Type() ContainerType
}

type ContainerHandlerFactory interface {
	// Create a new ContainerHandler using this factory. CanHandleAndAccept() must have returned true.
	NewContainerHandler(name string, metadataEnvAllowList []string, inHostNamespace bool) (c ContainerHandler, err error)

	// Returns whether this factory can handle and accept the specified container.
	CanHandleAndAccept(name string) (handle bool, accept bool, err error)

	// Name of the factory.
	String() string

	// Returns debugging information. Map of lines per category.
	DebugInfo() map[string][]string
}

type ContainerType int

const (
	ContainerTypeRaw ContainerType = iota
	ContainerTypeDocker
	ContainerTypeCrio
	ContainerTypeContainerd
	ContainerTypeMesos
	ContainerTypePodman
)

type ListType int

const (
	ListSelf ListType = iota
	ListRecursive
)

type MetricKind string

const (
	CpuUsageMetrics                MetricKind = "cpu"
	ProcessSchedulerMetrics        MetricKind = "sched"
	PerCpuUsageMetrics             MetricKind = "percpu"
	MemoryUsageMetrics             MetricKind = "memory"
	MemoryNumaMetrics              MetricKind = "memory_numa"
	CpuLoadMetrics                 MetricKind = "cpuLoad"
	DiskIOMetrics                  MetricKind = "diskIO"
	DiskUsageMetrics               MetricKind = "disk"
	NetworkUsageMetrics            MetricKind = "network"
	NetworkTcpUsageMetrics         MetricKind = "tcp"
	NetworkAdvancedTcpUsageMetrics MetricKind = "advtcp"
	NetworkUdpUsageMetrics         MetricKind = "udp"
	AppMetrics                     MetricKind = "app"
	ProcessMetrics                 MetricKind = "process"
	HugetlbUsageMetrics            MetricKind = "hugetlb"
	PerfMetrics                    MetricKind = "perf_event"
	ReferencedMemoryMetrics        MetricKind = "referenced_memory"
	CPUTopologyMetrics             MetricKind = "cpu_topology"
	ResctrlMetrics                 MetricKind = "resctrl"
	CPUSetMetrics                  MetricKind = "cpuset"
	OOMMetrics                     MetricKind = "oom_event"
	PressureMetrics                MetricKind = "pressure"
)

type MetricSet map[MetricKind]struct{}

type Plugin interface {
	// InitializeFSContext is invoked when populating an fs.Context object for a new manager.
	// A returned error here is fatal.
	InitializeFSContext(context *fs.Context) error

	// Register is invoked when starting a manager. It can optionally return a container watcher.
	// A returned error is logged, but is not fatal.
	Register(factory info.MachineInfoFactory, fsInfo fs.FsInfo, includedMetrics MetricSet) (watcher.ContainerWatcher, error)
}