@UnstableApi
    public static CloseableMeterBinder certificateMetrics(X509Certificate certificate,
                                                          MeterIdPrefix meterIdPrefix) {
        requireNonNull(certificate, "certificate");
        return certificateMetrics(ImmutableList.of(certificate), meterIdPrefix);
    }
Returns a new {@link MeterBinder} to observe the specified {@link X509Certificate}'s validity.
The following stats are currently exported per registered {@link MeterIdPrefix}.

<ul>
  <li>"tls.certificate.validity" (gauge) - 1 if TLS certificate is in validity period, 0 if certificate
      is not in validity period</li>
  <li>"tls.certificate.validity.days" (gauge) - Duration in days before TLS certificate expires, which
      becomes -1 if certificate is expired</li>
</ul>

@param certificate the certificate to monitor
@param meterIdPrefix the prefix to use for all metrics
core/src/main/java/com/linecorp/armeria/common/metric/MoreMeterBinders.java