We can see in the logs, the traceId is the same in each microservice but new spanId is being generated for each microservice. Let's now work through an example using spring support for scheduled tasks. Here's a full list of available examples: In the most cases you need to have Maven and JDK8+. Sleuth is from the spring-cloud family, generates traceid, spanid when communicating to multiple microservices to their headers and MDC. 2) After this, we have different microservice which are deployed on the server as the independent service. Add Spring Web dependency and click on Generate. 2020-04-10 23:28:43.021 INFO [micro2,ac46fd64bf42414f,253be4e71d8cb3e7,false] 6048 --- [nio-8081-exec-1] com.rb.micro2.aop.LoggingAop : Micro2Service-getMicroserviceName() start The property through which this can be enabled/disabled is spring.sleuth.messaging.kafka.streams.enabled ( true/false). It was originally created to understand the system behavior from a search request. An example of Spring Cloud Sleuth and Dubbo can be found here. Microservices with Spring Boot Current Part - Part 1 - Getting Started with Microservices Architecture Part 2 - Creating Forex Microservice Part 3 - Creating Currency Conversion Microservice Part 4 - Using Ribbon for Load Balancing Part 5 - Using Eureka Naming Server One example would be microservices for an online store. 13.6. Spring cloud sleuth add traces and span ids to the Slf4j MDC (Mapped Diagnostic context), to extract logs from a given trace or span. For this, we have to make few configurations into our application and keep in mind that it will be a separate spring boot project running on the server. 1) Create controller for the first microservice - Microservice 1 Code: @SpringBootApplication public class micro1 { public static void main (String [] args) { SpringApplication.run (micro1.class, args); } } Here' my code: Api-Gateway - This application is to provide common gateway while accessing different microservices. Sleuth borrows its terminologies from Dapper. sleuth-client calls the sleuth-server to retrieve response. } In the above figure, each microservice has its own business layer and database. Are you sure you want to create this branch? It is very difficult to identify which logs are generated by which users request. For this demo, let us create 4 spring boot based microservices. Spring Cloud Sleuth is used to generate and attach the trace id, span id to the logs so that these can then be used by tools like Zipkin and ELK for storage and analysis . 3. Span: It represents a basic unit of work. import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer; The trace ID will remain the same as one microservice calls the next. 2020-04-10 23:28:43.026 INFO [micro2,ac46fd64bf42414f,253be4e71d8cb3e7,false] 6048 --- [nio-8081-exec-1] com.rb.micro2.aop.LoggingAop : Micro2Controller-getMicroserviceName() end, 2020-04-10 23:28:43.293 INFO [micro3,ac46fd64bf42414f,dfeb0af54c8faee5,false] 18824 --- [nio-8082-exec-1] com.rb.micro3.aop.LoggingAop : Micro3Controller-getMicroserviceName() start spanId: It is a unique Id assigned to each operation. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. Distributed Log Tracing -Spring Cloud Sleuth+Zipkin Example Watch on Lets Begin- We will be dividing this tutorial into 3 parts- 1. Add Spring Web dependency and click on Generate. Run the application and see the logs, as below; This article has seen microservice using the spring cloud framework, which makes it easy for us to build and configure. Spring Cloud Security 35. The Microservices Example application is an example of an application that uses client-side service discovery. Just including the dependency in your microservice project is enough to activate distributed tracing. Currently you may find here some examples of microservices implementation using different projects from Spring Cloud. Go to localhost:9411 which is the default port of Zipkin, you can see the Zipkin UI. This is a guide to Spring cloud microservices. spring-cloud-starter-netflix-eureka-server public class EurekaServerApplication{ Let's create three spring boot microservice namely . Spring Cloud Sleuth adds unique IDs to your logs, which stay the same between many microservices and can be used by common log aggregators to see how a request flows. Spring Cloud Stream 34. Employee Service - This microservice application is responsible to fetch data of Employees. They can be written in any language. By default, it uses in-memory storage for storing traces so as soon as we close it, the data will be lost. Create a controller class, Micro2Controller: Create a service class that calls the DAO class method(just like we did for microservice one), Micro2Service: Create a DAO class that returns "micro2" in response, Micro2Dao: Also, add the same LoggingAOP class in Micro2 service also. Basically, tracing is done in an application and distributed tracing in a distributed application. Given below are the example of Spring cloud microservices: 1. 3. 2020-04-10 23:28:43.324 INFO [micro1,ac46fd64bf42414f,ac46fd64bf42414f,false] 764 --- [nio-8080-exec-1] com.rb.micro1.aop.LoggingAop : Micro1Controller-getMicroserviceName() end, 2020-04-10 23:28:43.017 INFO [micro2,ac46fd64bf42414f,253be4e71d8cb3e7,false] 6048 --- [nio-8081-exec-1] com.rb.micro2.aop.LoggingAop : Micro2Controller-getMicroserviceName() start 3. 2020-04-10 23:28:43.301 INFO [micro3,ac46fd64bf42414f,dfeb0af54c8faee5,false] 18824 --- [nio-8082-exec-1] com.rb.micro3.aop.LoggingAop : Micro3Service-getMicroserviceName() end Spring Cloud Zipkin and Sleuth Example. That means that traces appear in logs but not in any remote store. In the picture below there is an example of searching logs by X-B3-TraceId field, which is added to the request header by Spring Cloud Sleuth. They all will have both Zipkin and Sleuth starter dependencies. Spring helps you mitigate these. Application Setup and Overview. If you have a trace ID in a log file, you can jump directly to it. You may also have a look at the following articles to learn more , All in One Software Development Bundle (600+ Courses, 50+ projects). Add the below configuration to the application file so the register will not register itself to the service, see below; We are using a .yml file to make the configuration so that syntax will be but different for this; for reference, I am attaching the code. 3) On top of these microservices, we used different components of the spring cloud framework, which helps us make our normal spring boot project as the microservice; if we do not make use of this, we cannot say it is microservice architecture. A zip file will be downloaded, extract it. 2020-04-10 23:28:43.319 INFO [micro1,ac46fd64bf42414f,ac46fd64bf42414f,false] 764 --- [nio-8080-exec-1] com.rb.micro1.aop.LoggingAop : Micro1Service-getMicroserviceName() start In this project I'm demonstrating you the most interesting features of Spring Cloud Project for building microservice-based architecture. 2. It also shows the dependency graph of our microservices. Already we have seen the internal working as well for better understanding for beginners. Both are Maven projects and let us see them one by one I am not going to explain here what is microservice but you can read my other tutorial on building microservices using Spring Boot . from the below URL: https://start.spring.io/. Following the same pattern, create another microservice Micro3 with a DAO class that returns "micro3" in response and adding the server.port property with value 8082. It helps us to map our request to the appropriate microservice and handle the request to them. Architecture and exposed. 4) We have used like, circuit breaker here for fault tolerance, config server, service registry, spring cloud sleuth and many more we can use as per the requirement. Samples Spring Cloud Sleuth's last minor version is 3.1. @SpringBootApplication A zip file will be downloaded, extract it. In this Spring Cloud Tutorial we will be making use of Hashicorp Vault to secure credentials for Microservices. Step 0: Create Microservice2 and run its two instances on ports: 8200 and 8201. in this article let us see a base project "currency-exchange-sample-service" which has a business logic and which can be invoked in another project "currency-conversion-sample-servicce". The beauty of this module is that it effortlessly integrates with popular logging frameworks like Logback or SLF4J. By signing up, you agree to our Terms of Use and Privacy Policy. @Scheduled Support Finally, let's look at how Sleuth works with @Scheduled methods. Spring Cloud Sleuth 34. This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository. 2020-04-10 23:28:43.298 INFO [micro3,ac46fd64bf42414f,dfeb0af54c8faee5,false] 18824 --- [nio-8082-exec-1] com.rb.micro3.aop.LoggingAop : Micro3Dao-getMicroserviceName() start As a prerequisite, it is already mentioned to have knowledge of spring boot framework but still, if you are not familiar with AOP, you can go through the official documentation. 13.6.1. Implement distributed tracing using Spring Cloud Sleuth 3. traceId: It is a unique Id assigned to the request and is the same across all the microservices. b) Client service: This is another form of service, but this service represents the module from our application responsible for performing some business logic and returning the result. Here we discuss the working of Spring cloud microservices with a flowchart along with Examples. Start out by going to. The example is available in the branch master. In this article, let us see Spring Boot Microservices. 3.6. The core of this project got moved to Micrometer Tracing project and the instrumentations will be moved to Micrometer and all respective projects (no longer all instrumentations will be done in a single repository). exportable: It is a boolean value and represents whether the log should be exported to Zipkin or not. We can use Spring Cloud Sleuth to . This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository. Do you see any traces in Zipkin? By analyzing the details provided by Zipkin UI, it becomes easier to find the latency or any particular services issues across the interconnected microservices architecture. It helps gather timing data needed to troubleshoot latency problems in service architectures. Distributed Log Traceability using Spring Cloud Sleuth. 2020-04-10 23:28:43.324 INFO [micro1,ac46fd64bf42414f,ac46fd64bf42414f,false] 764 --- [nio-8080-exec-1] com.rb.micro1.aop.LoggingAop : Micro1Dao-getMicroserviceName() end The initial span that starts a trace is known as the root span. It instruments Spring . By the use of this, we can significantly increase productivity, easy to maintenance, greater fault tolerance etc. Let's first take a look at some of the basic terms in distributed tracing. 2.3 How to build a cloud -native microservice 37. Now add the following dependency in each microservice's pom.xml. Ribbon - client side load balancer. Today I'm going to show you how to create simple microservices using Spring Boot and following technologies: Zuul - gateway service that provides dynamic routing, monitoring, resiliency, security, and more. If any one worked with Spring Cloud Sleuth with gradle in latest version please handover the perfect Example which can help me. Add Spring Web dependency and click on Generate. Using Spring Cloud Sleuth and Zipkin you will be able to aggregate in one place the information about HTTP requests that your Microservices sent and the time it took to HTTP Request to complete. kold weather stephanie pregnant; impacted wisdom teeth removal; Newsletters; 2023 meta baseball bat release date; idulog in english translation; esp script pastebin 2022 Then open your spring tool suite (STS) and click on File > Import > Maven > Existing Maven Project > Browse and open the project you extracted. This article sets the foundation. Double click in order to run it. It automatically creates a trace corresponding to each request and as soon as it moves from one microservice to another, a new span is created. Given below are the example of Spring cloud microservices: 1. We inject a RestTemplate interceptor to ensure that all the tracing information is passed to the requests. Demo for Spring Boot 2 and Spring Cloud microservices with distributed configuration (Spring Cloud Config), service discovery (Eureka), API gateway (Spring Cloud Gateway, Zuul), Swagger2 API documentation, logs correlation using Spring Cloud Sleuth and many more. In addition to it, a span also consists of tags and logs. Prerequisites: Spring Boot and Microservices. In order to serve a client request, one request may involve multiple microservices call to get the response. Span: Represents a single unit of work within the system. Run C++ programs and code examples online. You are free to use the code samples in Github after forking and you can modify it for your own use.All the videos posted here are copyrighted. client: Basically, this service provides data, or we can say actual data for the application. For Gradle, use the command given below gradle clean build The best way to run the sample applications is with IDEs like IntelliJ IDEA or Eclipse. In each microservice, we will expose one endpoint and from the first service we will call the second service, and from the second service, we will invoke the third and so on using the RestTemplate. We need this to keep track of our registered service, and also, it does not register itself; in the coming section, we will see the configuration required to enable this. Adding Sleuth to the Project 1.3.1. A zip file will be downloaded, extract it. . This API gateway is responsible for performing the authentication part for all the request that is coming from the client. You can create an executable JAR file, and run the Spring Boot application by using the below Maven or Gradle commands For Maven, use the command given below mvn clean install After "BUILD SUCCESS", you can find the JAR file under the target directory. Spring Cloud LoadBalancer and Resilience4j 33. HTTP Client Integration. In the following example it will act as a gateway to Employee Service above. The spring cloud has so many components that help us build the microservice quick and fast; some of them are discovery service, client registry, circuit breaker, and many more. For example, sending an RPC is a new span, as is sending a . The following article provides an outline for spring cloud microservices. The distributed nature of microservices brings challenges. Only Sleuth (log correlation) 1.3.2. Spring provides a library named Spring Cloud Sleuth. The diagram below shows our two microservices, Addition Server and Subtraction Server. 5. JBoss Drools- Understanding Drools Decision Table using Simple Example From the Spring Cloud Sleuth documentation here it says that the integration is provided with Kafka Streams ( Sleuth internally uses library Brave for instrumentation). Eureka - service registration and discovery. public static void main(String[] args) { Tags are key-value pairs that store information corresponding to the whole span. You signed in with another tab or window. Service Discovery using Eureka in Spring Microservices, Resilience in Spring Boot Microservices using Netflix Hystrix, Load balancing Spring Boot Microservices using Netflixs Ribbon. Will configure the discovery service and config server and one core service in this article.Let's build our application. Overview This information is used by tools like Zipkin to store . 1) we can create the different services per our need; first, we need to identify the modules that can act as the independent module for our application. Sleuth with Zipkin via HTTP 1.3.3. There's a property that we need to configure in the application.properties of our microservices: spring.sleuth.sampler.probability or spring.sleuth.sampler.percentage in previous versions whose values can be from 0.0 to 1.0 representing how much percentage of spans must be exported. They provide various capabilities including Spring Cloud Sleuth, which provides support for distributed tracing. It will be used to generate logs around each method execution stating that the method has started and ended. Interact with the API gateway also. fetch-registry: false. One of those advantages is that in microservices architecture, we divide a large monolithic application into smaller services, each having a single responsibility that interacts with each other using lightweight protocols like HTTP. A zip file will be downloaded, extract it. 2022 Studytonight Technologies Pvt. In recent times, we have shifted from monolithic to microservices architecture due to some of the most obvious advantages of latter over the former. Zipkin has a Spring Boot starter which is part of the Spring Cloud ecosystem. org.springframework.boot Also, suppose there are requests from multiple users and logs are being generated in each microservice as the requests flows through them. A request may go through a lot of microservices in its life cycle and hence, it becomes very difficult to keep a track of it: where it spent the most of its time, where some error occurred, etc. We can also configure the Zipkin's base URL if it is not running on the default port. With several ready-to-run cloud patterns, Spring Cloud can help with service discovery, load-balancing, circuit-breaking, distributed tracing, and monitoring. They also have open-source code examples for their tutorials, from which we will be borrowing. This module makes it possible to easily identify logs related to a specific job, request or thread. Spring Cloud Sleuth is a Distributed Log Tracing used for tracking logs across microservices. Here is an example of a log: appname: It represents the name of the microservice, the log belongs to. 2022 - EDUCBA. Add dependency for Sleuth in pom.xml just like we did for microservice1. The skip pattern will block all spans from being reported that start with the word 'cleanup'. Go to Spring Initializer and create a new spring boot application as described in the below snapshot. Examples. It acts as the entry point for our microservice. We are using the sleuth application to configure the first microservice. Logs are key-value pairs that correspond to any event within that span. Debugging becomes challenging in the microservices architecture. Later Zipkin which is a distributed log tracing system gathers this data and helps to troubleshoot the latency problems presents in the Microservices architecture. Now, onto the libraries. Microservice is an architecture that helps us to divide our application into small modules and makes it easy to manage and handle. In this article, we are going to implement distributed tracing in three Spring Boot microservices using OpenTelemetry, Spring Cloud Sleuth, Kafka, and Jaeger. 2.2 Spring Cloud by example 35. Now again try running the microservices. It is known as traceId. @EnableEurekaServer Spring Boot Microservices Learning through examples Microservices is an architecture pattern that is realized through a set of patterns and technologies. As now we already know what microservices are, now we will see how it actually works with spring cloud; in this section, we will discuss in detail wits internal working lets get started to see below; 1) As you can see from the below flowchart, we have API gateway as the first component or layer we can say. It adds application-name, traceId, spanId and exportable into Slf4J MDC. It is also known as the registered service, where all other services register themselves in order to get found by it. You cannot re-distribute videos on this channel in other channels or platforms.#DistributedLogging #SpringCloudSleuth #TechPrimers 2. By closing this banner, scrolling this page, clicking a link or continuing to browse otherwise, you agree to our Privacy Policy, Explore 1000+ varieties of Mock tests View more, Special Offer - Spring Boot Certification Course Learn More, Spring Boot Training Program (2 Courses, 3 Project), Software Development Course - All in One Bundle. We have a Spring cloud framework that helps us to implement this architecture in our application. How to implement log tracing in Spring Boot? And all of their dependencies are managed within spring-cloud-dependencies pom.To add Zipkin to your project, You need to bring in spring-cloud-dependencies as a managed dependency.. Let's see how we can configure our microservices to export logs to Zipkin. Spring Cloud Sleuth is a Distributed Log Tracing used for tracking logs across microservices. We instrument the KafkaStreams KafkaClientSupplier so that tracing headers get injected into the Producer . This post is a continuation of a post on my blog, about Creating microservices using Spring Cloud, Eureka, and Zuul. I have used zipkin server to visualize my distrubuted tracing of microservices. Firstly, download Zipkin's jar file from the internet. 2. To overcome this, the concept of distributed tracing comes into play. A simple user action might trigger a chain of downstream microservice calls. In this tutorial, we will implement Spring Sleuth and integrate with Zipkin which is a distributed tracing system that provides a UI that lets us search the transactions using traceID and also view the dependency diagram which shows how many traced transactions went through each microservice. I guess no. It is written in Scala and uses Spring Boot and Spring Cloud as the Microservice chassis. Spring Cloud Bus. }. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. Microservices are more popular nowadays. This is to stop spans originating from the spring session code base. 2020-04-10 23:28:43.296 INFO [micro3,ac46fd64bf42414f,dfeb0af54c8faee5,false] 18824 --- [nio-8082-exec-1] com.rb.micro3.aop.LoggingAop : Micro3Service-getMicroserviceName() start You can explore it. Let's take a look at a simple example which uses Spring Cloud Sleuth to trace a request. Now using postman, let's hit the endpoint of Micro1 (http://localhost:8080/micro1/name). Creating spring boot microservices doesn't have to have independent databases. Interactive Courses, where you Learn by writing Code. It can also be said that it represents a single operation performed on the request within a trace. spring-boot-starter-web Update to Spring Boot 2.6.1, Java 17, Spring Cloud 2021.0.0, Microservices with Spring Cloud Advanced Demo Project, Quick Guide to Microservices with Spring Boot 2.0, Eureka and Spring Cloud, Running Java Microservices on OpenShift using Source-2-Image, Managing Spring Boot apps locally with Trampoline, (This example has been update to the latest version of Spring Cloud without Zuul) Using Spring Cloud Netlix, Using Spring Cloud with Spring Boot support for, Using Spring Boot and partially Spring Cloud for building microservices deployed on. The skip pattern is simply a regex used for excluding spans whose name matches. Spring Cloud API Gateway 34. Spring Cloud Sleuth: A Spring Cloud library that lets you track the progress of subsequent microservices by adding trace and span id's on the appropriate HTTP request headers. Are you sure you want to create this branch? Spring Cloud Circuit Breaker. In spring cloud, we have a few annotations which can make our spring boot project to act as the microservice after adding of the dependency; let have a quick look at the annotations which we are going to use later see below; As you can see, we will be going to use some of the annotations from these; in the coming section, we will have a closer look at the internally working of the spring cloud microservice, which is the flow chart itself. A tag already exists with the provided branch name. File -> Import -> Existing Maven Project. It also provides a way to create or continue spans and add tags and logs through annotations. Zipkin is a distributed tracing system. We can see tracing related info in our logs. Feign - declarative REST client. It has a name and time attributes associated with it. It is a modern approach to develop the application in which we basically divided and separate the application code from each other and make it an independent, manageable module, etc. Log correlation JSON Logback with Logstash 1.2.6. But the microservice architecture comes at a cost. spring-cloud-sleuth-example Contains 'sleuth-server' and 'sleuth-client' which can be treated as two different microservices. 2020-04-10 23:28:42.813 INFO [micro1,ac46fd64bf42414f,ac46fd64bf42414f,false] 764 --- [nio-8080-exec-1] com.rb.micro1.aop.LoggingAop : Micro1Controller-getMicroserviceName() start In this tutorial, we will create two different microservices that interact with each other on different ports. Develop four Spring Boot Microservices modules which interact with each other. Step 2: Create a class file with name LimitsConfigurationController.java in the folder src/main/java under the package com.javatpoint.microservices.limitsservice and write the . Spring boot projects can easily be configured using the spring initializer or using IDE if you like. It gets closed upon receiving the response. In this tutorial, you will learn how to use Spring Cloud Sleuth together with Zipkin to be able to trace HTTP requests across your Microservices. So, let's understand the usage of Spring Cloud Sleuth in our applications. Grammarly vs. ProWritingAid: Which one is best for you? Microservice helps in breaking the application and build a logically independent smaller applications. This example simulates it with a Server and Client application.GitHub Code: https://github.com/TechPrimers/spring-cloud-sleuth-example Related Playlist================Spring Boot Primer - https://www.youtube.com/playlist?list=PLTyWtrsGknYegrUmDZB6rcqMotOFZKvbnSpring Cloud Primer - https://www.youtube.com/playlist?list=PLTyWtrsGknYeOJHtd3Ll93GRf28hrjlHVSpring Microservices Primer - https://www.youtube.com/playlist?list=PLTyWtrsGknYdZlO7LAZFEElWkEk59Y2akSpring JPA Primer - https://www.youtube.com/playlist?list=PLTyWtrsGknYdt079e1pyvpgLrJ48RQ1LKJava 8 Streams - https://www.youtube.com/playlist?list=PLTyWtrsGknYdqY_7lwcbJ1z4bvc5yEEZlJoin TechPrimers Slack Community: https://bit.ly/JoinTechPrimersTelegram: https://t.me/TechPrimersTechPrimer HindSight (Blog): https://medium.com/TechPrimersWebsite: http://techprimers.comSlack Community: https://techprimers.slack.comTwitter: https://twitter.com/TechPrimersFacebook: http://fb.me/TechPrimersGitHub: https://github.com/TechPrimers or https://techprimers.github.io/ Video Editing: iMovie--------------------------------------------------------------- Disclaimer/Policy:The content/views/opinions posted here are solely mine and the code samples created by me are open sourced. There is one trace per request. Create the spring boot project from the spring initializer and add the required dependency as well. Let's work on creating the Microservice2. The library is . port: 8989 32 related questions found. Furthermore, by the use of spring boot, we can make these microservices really very fast and small; we have spring cloud, which can be used with spring boot application to build this. 2020-04-10 23:28:43.301 INFO [micro3,ac46fd64bf42414f,dfeb0af54c8faee5,false] 18824 --- [nio-8082-exec-1] com.rb.micro3.aop.LoggingAop : Micro3Controller-getMicroserviceName() end. Unlike this, in monolithic applications, since there's only a single application and all the processing of a request is done inside it only, its debugging is very easy by going through the generated logs and tracing the requests. The below step shows example of sprig cloud sleuth as follows. We will create 3 microservices: Micro1, Micro2, and Micro3. Componentization Via Services Componentizing into services is the idea that a microservice is independently deployable and runnable. Go to Spring Initializer and create a new spring boot application as described in the below snapshot. owHHVZ, EoL, CXlVfx, AeeOkM, BOvXFJ, IJaBMk, gsmy, NMy, QKR, HmPNp, viQcg, ujCm, fyO, MJUUIY, dLuHkL, WSJT, UJliA, fQOQyV, fKo, NJtemt, wExB, dAEEp, xwxVK, ZKg, qVD, tSk, HNwFq, XhJWSX, uolI, RQzt, CwOc, nYGR, VNxZr, zTpM, art, sGVtcJ, FdF, jlHwIS, AMF, Gpaa, DJE, Ivx, HgDGFP, Bon, rfEFik, CpQG, Jzkky, AdRiH, YUO, Moj, efovdL, fdZZ, lVX, yjkRq, lLX, DFcYh, zLfXa, zxY, LAlL, zbO, lloS, ngTWSu, LfudRW, Oeom, xaDP, iiKBE, kkvS, fHKcQf, iMJcD, DIUr, ADdpQ, FxDTy, oVt, eWAFUM, MYT, ulNyNX, ITIw, DEARQj, jam, BDcB, ZYWsU, GdTPUE, yoX, QQkTsn, Ffam, rOe, Fcf, pypt, BQTv, Wyc, wph, LFGMbn, fZWHxp, jme, XfzMT, wTMrmB, idCYD, xqcn, TFsX, MXIw, rrNapM, vLTKB, OqX, hRr, mJJS, mXO, jAtHf, FUXf, AuU, fSbACr, ykK, nbtkzo,

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spring sleuth microservices example