kapacitor | 易学教程

开放、普惠、高性能-SLS时序存储助力打造企业级全方位监控方案

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无所不在的时序数据时间带走一切，长年累月会把你的名字、外貌、性格、命运都改变。 ---柏拉图随着时间的推移，万事万物都在不停的变化，而我们也会用各种数字去衡量这些变化信息，比如年龄、重量、速度、温度、金钱...在数字化时代中，我们会把这些随着时间变化的数据保存起来，挖掘这些数据的价值。通常我们会称这类数据为---时序数据。时序数据用于描述物体在时间维度上的状态变化信息。时序数据在各行各业都得到了非常广泛的应用，例如股票走势、交易趋势、服务器指标、脉搏心跳、定位坐标、能耗趋势等等，而这些数据几乎在所有的场景中都得到了应用，例如：各类炒股软件提供众多不同维度的股票K线图，为广大股民提供参考标准； Apple Watch通过监控佩戴者的心率信息，帮助人们提早发现严重的心脏疾病；国家电网通过分析各个小区、住户的用电量曲线，来判断是否有偷电漏电情况；电商类的公司会监控平台的下单、交易、退货、评价等关键流程的变化趋势，用来快速发现各类异常；各个游戏平台通过分析每个用户角色的操作、位置等变化规律，来判断是否使用了作弊辅助工具... 我们需要一个什么样的时序存储为了能够支撑各种场景的时序分析、监控等需求，近几年在开源和商业领域均出现了一些时序存储的引擎，例如TimescaleDB、CrateDB、InfluxDB、OpenTSDB、Prometheus等

How to define Alerts with exception in InfluxDB/Kapacitor

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问题 I'm trying to figure out the best or a reasonable approach to defining alerts in InfluxDB. For example, I might use the CPU batch tickscript that comes with telegraf. This could be setup as a global monitor/alert for all hosts being monitored by telegraf. What is the approach when you want to deviate from the above setup for a host, ie instead of X% for a specific server we want to alert on Y%? I'm happy that a distinct tickscript could be created for the custom values but how do I go about

Streaming Data Processing and nano second time resolution

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问题 I'm just starting into the topic of real-time stream data processing frameworks, and I have a question to which I as of yet could not find any conclusive answer: Do the usual suspects (Apache's Spark, Kafka, Storm, Flink etc.) support processing data with an event time resolution of nanoseconds (or even picoseconds)? Most people and documentation talk about a millisecond or microsecond resolution, but I was unable to find a definite answer if more resolution would be possible or a problem.

Kapacitor .post() HTTP Post to url not sending data

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问题 I am using kapacitor to send alert to URL using HTTP POST. Written script is hitting on given url but it is not sending related data to any of given url. Following is my TICK script. stream |from() .measurement('cpu') |alert() .id('kapacitor/{{ index .Tags "host"}}') .message('{{ .ID }} is {{ .Level }} value:{{ index .Fields "value" }}') .info(lambda: TRUE) .post('http://localhost:1440/alert') .post('http://localhost/test.php') Following is a first post script: var express = require("express"