metrics

type Height interface {
	Accepted(height uint64)
}

type Latency interface {
	// Issued marks the item as having been issued.
	Issued(id ids.ID, pollNumber uint64)

	// Accepted marks the item as having been accepted.
	// Pass the container size in bytes for metrics tracking.
	Accepted(id ids.ID, pollNumber uint64, containerSize int)

	// Rejected marks the item as having been rejected.
	// Pass the container size in bytes for metrics tracking.
	Rejected(id ids.ID, pollNumber uint64, containerSize int)

	// MeasureAndGetOldestDuration returns the amount of time the oldest item
	// has been processing.
	MeasureAndGetOldestDuration() time.Duration

	// NumProcessing returns the number of currently processing items.
	NumProcessing() int
}

type Polls interface {
	Successful()
	Failed()
}

type Timestamp interface {
	Accepted(ts time.Time)
}