func (m Metrics) RecordPutError() {
	for _, me := range m.MetricEngines {
		me.RecordPutError()
	}
}
Methods so the metrics object executes the methods of the `CacheMetrics` interface
package metrics
import (
	"time"
	"github.com/prebid/prebid-cache/config"
	influx "github.com/prebid/prebid-cache/metrics/influx"
	prometheus "github.com/prebid/prebid-cache/metrics/prometheus"
)
type Metrics struct {
	MetricEngines []CacheMetrics
}