metrics is always insert into db with last histogram data

[cqwang]

when I set the interval 5 seconds to sync，always using last histogram data，sush as count, max, min .
I just want to get the latest 1 minute data, not contains the data before.

my init:
`
var host = ConfigurationManager.AppSettings["Metrics.InfluxDb.Host"];
var port = ushort.Parse(ConfigurationManager.AppSettings["Metrics.InfluxDb.Port"]);
var database = ConfigurationManager.AppSettings["Metrics.InfluxDb.DB"];
var userName = ConfigurationManager.AppSettings["Metrics.InfluxDb.UserName"];
var password = ConfigurationManager.AppSettings["Metrics.InfluxDb.Password"];
var intervalSeconds = double.Parse(ConfigurationManager.AppSettings["Metrics.InfluxDb.Interval.Seconds"]);
var environment = ConfigurationManager.AppSettings["Environment"];
var batchSize = int.Parse(ConfigurationManager.AppSettings["Metrics.InfluxDb.BatchSize"]);

        Metric.Config.WithReporting(report => report
            .WithInfluxDbHttp(host, port, database, userName, password, null, null, TimeSpan.FromSeconds(intervalSeconds), null, configFunc => configFunc
            .WithConverter(new DefaultConverter().WithGlobalTags($"env={environment},host={Dns.GetHostName()}"))
            .WithFormatter(new DefaultFormatter().WithLowercase(true))
            .WithWriter(new InfluxdbHttpWriter(configFunc, batchSize))));

`

then , I change the default value in HistogramMetric.cs
public HistogramValue GetValue(bool resetMetric = true) { var value = new HistogramValue(this.last.Value, this.last.UserValue, this.reservoir.GetSnapshot(resetMetric)); if (resetMetric) { this.Reset(); } return value; }

It is ok now, but I cannot believe it Please help me, thanks.