ethstats: report block miner, gas limit and gas consumption

ethstats/ethstats.go

@@ -294,6 +294,9 @@ func (s *Service) reportLatency(in *json.Decoder, out *json.Encoder) error {
 type blockStats struct {
 	Number    *big.Int       `json:"number"`
 	Hash      common.Hash    `json:"hash"`
+	Miner     common.Address `json:"miner"`
+	GasUsed   *big.Int       `json:"gasUsed"`
+	GasLimit  *big.Int       `json:"gasLimit"`
 	Diff      string         `json:"difficulty"`
 	TotalDiff string         `json:"totalDifficulty"`
 	Txs       txStats        `json:"transactions"`
@@ -351,6 +354,9 @@ func (s *Service) reportBlock(out *json.Encoder) error {
 		"block": &blockStats{
 			Number:    head.Number,
 			Hash:      head.Hash(),
+			Miner:     head.Coinbase,
+			GasUsed:   new(big.Int).Set(head.GasUsed),
+			GasLimit:  new(big.Int).Set(head.GasLimit),
 			Diff:      head.Difficulty.String(),
 			TotalDiff: td.String(),
 			Txs:       txs,