@UnstableApi
    public static DistributionStatisticConfig distributionStatisticConfig() {
        return DISTRIBUTION_STATISTIC_CONFIG;
    }
Returns the default {@link DistributionStatisticConfig} of the {@link Timer}s and
{@link DistributionSummary}s created by Armeria.

<p>The default value of this flag is as follows:
<pre>{@code
DistributionStatisticConfig.builder()
    .percentilesHistogram(false)
    .serviceLevelObjectives()
    .percentiles(
         0, 0.5, 0.75, 0.9, 0.95, 0.98, 0.99, 0.999, 1.0)
    .percentilePrecision(2)
    .minimumExpectedValue(1.0)
    .maximumExpectedValue(Double.MAX_VALUE)
    .expiry(Duration.ofMinutes(3))
    .bufferLength(3)
    .build();
}</pre>
core/src/main/java/com/linecorp/armeria/common/Flags.java