Metrics in ServiceComb Java Chassis 1.0.0-m1 郑扬勇 微服务架构师 开源能力中心 让微服务运行状态清晰可见 目录 • Metrics简介 • 基于BMI示例演示 • Metrics技术细节 Metrics是什么 • 直译是“度量”，不同的领域定义有所区别，在微服务领域中的 定义： “对微服务的某个指标给予一个可量化程度的测量” • Metrics应该具备的特性： • Comparative（可对比）：指标能够在不同的微服务或同一个微服务的多 个实例之间比较； • Understandable（易理解）：指标所衡量的对象、计算方法和输出的结果 值都是容易理解的； • Ratio（理想的比例）：理想结果可预见，可以立即用于比较。 最常见的Metrics • 衡量Metrics实现 优劣的标准： • 关键指标覆盖 全 • 计量准确 • 高性能低资源 占用 • 无侵入或低侵 入 Metrics的分类 • Metrics有很多种分类方式，在技术实现上我们偏向以取值方式区 分为两种： • 1. 直接取值 • 任何时候都能够立刻获取到最新值，例如资源使用率，包括CPU使用率，线程数， Heap使用数据等等，还有调用累加次数，当前队列长度等等。

Ubuntu Server is a version of the Ubuntu operating system designed and engineered as a backbone for the internet. Ubuntu Server brings economic and technical scalability to your datacentre, public or 000-node render farm, Ubuntu Server delivers the best value scale-out performance available. In this documentation Tutorials Get started - a hands-on introduction to Ubuntu Server for new users How-to guides Technical information - package specifications, APIs, architecture Project and community Ubuntu Server is a member of the Ubuntu family. It’s an open source project that welcomes community projects, contributions

Ubuntu Server Guide Ubuntu Server Guide Copyright © 2018 Contributors to the document Abstract Welcome to the Ubuntu Server Guide! It contains information on how to install and configure various server Contributors to this document are: • Members of the Ubuntu Documentation Project2 • Members of the Ubuntu Server Team3 • Contributors to the Community Help Wiki4 • Other contributors can be found in the revision org/licenses/by-sa/3.0/ 2 https://launchpad.net/~ubuntu-core-doc 3 https://launchpad.net/~ubuntu-server 4 https://help.ubuntu.com/community/ 5 https://bazaar.launchpad.net/~ubuntu-core-doc/serverguide/trunk/changes

com © 2024 Bloomberg Finance L.P. All rights reserved. • Create a basic HTTP server. • Allow a single-threaded server handling multiple clients. • Use the sender/receiver asynchronous framework.

Apache HTTP Server Documentation Version 2.4 Apache Software Foundation March 21, 2018 ii About The PDF Documentation Licensed to the Apache Software Foundation (ASF) under one or more contributor copy of the License at http://www.apache.org/licenses/LICENSE-2.0 This version of the Apache HTTP Server Documentation is converted from XML source files to LATEX using XSLT with the help of Apache Ant the documentation on the Apache HTTP Server website at http://httpd.apache.org/docs/2.4/ The Apache HTTP Server Documentation is maintained by the Apache HTTP Server Documentation Project. More information

Apache HTTP Server Documentation Version 2.4 Apache Software Foundation February 3, 2014 ii About The PDF Documentation Licensed to the Apache Software Foundation (ASF) under one or more contributor copy of the License at http://www.apache.org/licenses/LICENSE-2.0 This version of the Apache HTTP Server Documentation is converted from XML source files to LATEX using XSLT with the help of Apache Ant the documentation on the Apache HTTP Server website at http://httpd.apache.org/docs/2.4/ The Apache HTTP Server Documentation is maintained by the Apache HTTP Server Documentation Project. More information

Apache HTTP Server Documentation Version 2.4 Apache Software Foundation October 3, 2017 ii About The PDF Documentation Licensed to the Apache Software Foundation (ASF) under one or more contributor copy of the License at http://www.apache.org/licenses/LICENSE-2.0 This version of the Apache HTTP Server Documentation is converted from XML source files to LATEX using XSLT with the help of Apache Ant the documentation on the Apache HTTP Server website at http://httpd.apache.org/docs/2.4/ The Apache HTTP Server Documentation is maintained by the Apache HTTP Server Documentation Project. More information

Apache HTTP Server Documentation Version 2.4 Apache Software Foundation March 13, 2014 ii About The PDF Documentation Licensed to the Apache Software Foundation (ASF) under one or more contributor copy of the License at http://www.apache.org/licenses/LICENSE-2.0 This version of the Apache HTTP Server Documentation is converted from XML source files to LATEX using XSLT with the help of Apache Ant the documentation on the Apache HTTP Server website at http://httpd.apache.org/docs/2.4/ The Apache HTTP Server Documentation is maintained by the Apache HTTP Server Documentation Project. More information

Apache HTTP Server Documentation Version 2.0 Apache Software Foundation February 3, 2014 ii About The PDF Documentation Copyright c⃝2013 The Apache Software Foundation Licensed under the Apache License copy of the License at http://www.apache.org/licenses/LICENSE-2.0 This version of the Apache HTTP Server Documentation is converted from XML source files to LATEX using XSLT with the help of Apache Ant the documentation on the Apache HTTP Server website at http://httpd.apache.org/docs/2.0/ The Apache HTTP Server Documentation is maintained by the Apache HTTP Server Documentation Project. More information

Apache HTTP Server Documentation Version 2.2 Apache Software Foundation January 15, 2017 ii About The PDF Documentation Copyright c⃝2015 The Apache Software Foundation Licensed under the Apache License copy of the License at http://www.apache.org/licenses/LICENSE-2.0 This version of the Apache HTTP Server Documentation is converted from XML source files to LATEX using XSLT with the help of Apache Ant the documentation on the Apache HTTP Server website at http://httpd.apache.org/docs/2.2/ The Apache HTTP Server Documentation is maintained by the Apache HTTP Server Documentation Project. More information