用于云原生场景下集群监控数据的收集、即席分析(Ad Hoc)和报警
处于 Kubernetes 生态，需要能很方便与之集成，被收集对象(target)的种类和数量会动态变化
可扩展：能应对集群规模逐步变大的场景：从成百到上千台机器，上万容器的规模
追求单机模式下极高的写入吞吐和查询速度，比如支持每秒百万采样数据的写入。
场景特点
因为生态中已经有服务发现组件，而且是内网环境，所以它会定期、批量拉取数据，需支持高并发写入。
需要存储的指标序列(metric series)数量级会很大。比如一个 Kuberntes 集群中500台机器，每台机器上有几十上百个目标，每个目标里20个指标。这样会有 50010020 = 1,000,000，一百万个序列。
数据写入和读取的形式完全不同：数据写入按照指标维度，而读取是按照时间区间。最终查询时涉及的区域以时间为横轴，指标不同维度为纵轴的矩形。
序列翻腾(Series Churn)问题：随着时间推移，一些指标序列会进入非活跃状态，即再也不会接收到新的数据，而新的序列会出现。这在云环境，尤其是 Kuberntes 这种环境下非常常见：主机粒度、服务实例粒度、容器粒度都会弹性伸缩。
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