metrics

type Metrics struct {
	// 各个分片级别的metrics
	ShardHeight         *prometheus.GaugeVec
	StorageShardHeight  *prometheus.GaugeVec
	PendingTxNum        *prometheus.GaugeVec
	ShardPresence       *prometheus.GaugeVec
	ShardEnableMinerNum *prometheus.GaugeVec
	BroadcastedMsgCnt   *prometheus.CounterVec
	ConfirmedTxCnt      *prometheus.CounterVec
	// 全局的metrics 小贴士: prometheus.Gauge是接口类型，如果用指针*prometheus.Gauge的话，无法正常调用方法
	OnlineMiner      prometheus.Gauge
	ConnectedPeerNum prometheus.Gauge
	EnableShardsNum  prometheus.Gauge
}