type rebalanceMeta struct {
	cancel          context.CancelFunc `msg:"-"` // to be invoked on rebalance-stop
	lastRefreshedAt time.Time          `msg:"-"`
	StoppedAt       time.Time          `msg:"stopTs"` // Time when rebalance-stop was issued.
	ID              string             `msg:"id"`     // ID of the ongoing rebalance operation