func logRefInitMetrics(ctx context.Context, mf monitoring.MetricFactory) {
	logListLastRefresh = mf.NewGauge("log_list_last_refresh", "Unix timestamp for last successful Log-list refresh")
}
logRefInitMetrics initializes all the exported metrics.
package submission
import (
	"context"
	"fmt"
	"sync"
	"time"
	"github.com/google/certificate-transparency-go/schedule"
	"github.com/google/trillian/monitoring"
)
var (
	logRefOnce         sync.Once
	logListLastRefresh monitoring.Gauge  
)