add gas used metric

arbos/block_processor.go

@@ -25,6 +25,7 @@ import (
 	"github.com/ethereum/go-ethereum/core/vm"
 	"github.com/ethereum/go-ethereum/crypto"
 	"github.com/ethereum/go-ethereum/log"
+	"github.com/ethereum/go-ethereum/metrics"
 	"github.com/ethereum/go-ethereum/params"
 	"github.com/ethereum/go-ethereum/trie"
 )
@@ -39,6 +40,7 @@ var L2ToL1TransactionEventID common.Hash
 var L2ToL1TxEventID common.Hash
 var EmitReedeemScheduledEvent func(*vm.EVM, uint64, uint64, [32]byte, [32]byte, common.Address, *big.Int, *big.Int) error
 var EmitTicketCreatedEvent func(*vm.EVM, [32]byte) error
+var gasUsedSinceStartupCounter = metrics.NewRegisteredCounter("arb/sequencer/gasused", nil)
 
 type L1Info struct {
 	poster        common.Address
@@ -422,6 +424,10 @@ func ProduceBlockAdvanced(
 			blockGasLeft = 0
 		}
 
+		// add gas used since startup to prometheus metric
+		gasUsed := arbmath.SaturatingUSub(receipt.GasUsed, receipt.GasUsedForL1)
+		gasUsedSinceStartupCounter.Inc(arbmath.SaturatingCast(gasUsed))
+
 		complete = append(complete, tx)
 		receipts = append(receipts, receipt)