stats

type Counter interface {
	// Value is the current value of the counter.
	Value() int64
	// Set sets a new value to the counter, and returns the previous one.
	Set(int64) int64
	// Add adds a value to the current counter value, and returns the previous value.
	Add(int64) int64
}

type Manager interface {
	features.Feature

	// RegisterCounter registers a new counter to the manager. The identifier string must not be emtpy, and unique among other counters.
	RegisterCounter(string) (Counter, error)
	// GetCounter returns a counter by its identifier.
	GetCounter(string) Counter
}

type NoopManager struct{}