message: Proxyd should use json logging
diff: package main
  import (
  + "os"
  +
  "github.com/BurntSushi/toml"
  "github.com/ethereum-optimism/optimism/go/proxyd"
  "github.com/ethereum/go-ethereum/log"
  - "os"
  )
  var (
  @@ -19,7 +20,7 @@ func main() {
  log.Root().SetHandler(
  log.LvlFilterHandler(
  log.LvlInfo,
  - log.StreamHandler(os.Stdout, log.TerminalFormat(true)),
  + log.StreamHandler(os.Stdout, log.JSONFormat()),
  ),
  )
  