This allows Spring Boot projects to use the normal configuration toolchain, while allowing them to configure the Netflix tools, for the most part, as documented. Gauges show some current value, such as the size of a queue or number of threads in a running state. 10.1 Dimensional Versus Hierarchical Metrics. Archaius Basics Netflix Archaius is a library for managing configuration for an application. One of the infrastructure components that Spring-Cloud provides is a Configuration server to centralize the properties of an application, however it is possible that you that you may be using other solutions to manage the properties. With this new library in place, Archaius Configuration, all that now needs to be done is to define Spring beans which extend Apache Commons Configuration AbstractConfiguration class and these would automatically get configured by Spring Cloud. Netflix OSS provides a great example of the client‑side discovery pattern. This works well with Spring Cloud Config for making Archaius configuration aware of Spring Environment properties at startup. Join the DZone community and get the full member experience. You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. Create composite configs. Spring Cloud Security. Doing so avoids potential “GC Overhead Limit Reached” issues where ServoMonitorCache treats each URL as a unique key. You need a spring.cloud.config.server.git.uri to locate the configuration data for your own needs (by default it is the location of a git repository, and can be a local file:.. Spring applications should generally not use Archaius directly, but the need to configure the Netflix tools natively remains. Spring Cloud Netflix. Home » org.springframework.cloud » spring-cloud-starter-netflix-archaius » 2.1.0.M1 Spring Cloud Starter Netflix Archaius » 2.1.0.M1 Spring Cloud Starter Netflix Archaius One such solution is Netflix Archaiusand if you work with Netflix Archaius there is a neat way that Spring-Cloud provides to integrate with it. Netflix Archaius was written to handle distributed configuration management of services in the cloud. You may want to check out the right sidebar which shows the related API usage. For long-running operations, Spectator provides a special LongTaskTimer. For example, a distribution summary could be used to measure the payload sizes of requests hitting a server. Spring Cloud provides a Spring Boot Auto-configuration for Archaius which gets triggered on finding the Archaius related libraries with the application. Servo served Netflix for several years and is still usable but is gradually being phased out in favor of Spectator, which is designed to work only with Java 8. Spring Cloud Netflix Archaius License: Apache 2.0: Date (Oct 24, 2018) Files: jar (13 KB) View All: Repositories: Central Sonatype Spring Lib Release: Used By : 6 artifacts: Note: There is a new version for this artifact. Contribute to spring-cloud/spring-cloud-netflix development by creating an account on GitHub. A counter measures the rate at which some event is occurring, as shown in the following example: The counter records a single time-normalized statistic. No es una pieza de Netflix como tal (ya que en Netflix utilizaban Archaius), sino que ha sido desarrollada por Spring. Support for OpenTelemetry was added. Working with Spring Cloud and Netflix Archaius, Developer A Servo timer with a name of restclient is recorded for each MVC request, which is tagged with the following information: Avoid using hard-coded URL parameters within RestTemplate. Spectator provides four meter types: counter, timer, gauge, and distribution summary. The normal use of a gauge involves registering the gauge once on initialization with an ID, a reference to the object to be sampled, and a function to get or compute a numeric value based on the object. Contribute to spring-cloud/spring-cloud-netflix development by creating an account on GitHub. The spring-cloud-netflix-archaiuslibrary comes then into play, merging all the different property sources, and auto-configuring the Archaius tools with these sources. To do this, just like with Eureka and Ribbon, you set up a configuration server and use a Java library to lookup configuration values. Spring Cloud Netflix provides Netflix OSS integrations for Spring Boot apps through autoconfiguration and binding to the Spring Environment and other Spring programming model idioms. netflix相关WARN:No URLs will be polled as dynamic configuration sources.网上有个年轻人告诉我,在resources下创建一个空白配置文件 config.propert… 写文章 spring boot启动警告 The Spring Cloud reference Archaius is an extension of the Apache Commons Configuration project. Token Relay support was moved to Spring Cloud Gateway (see above). Spring Cloud Netflix Archaius License: Apache 2.0: Date (Dec 11, 2018) Files: jar (13 KB) View All: Repositories: SpringFramework: Used By: 6 artifacts: Note: There is a new version for this artifact. Spring Cloud has a Spring Environment Bridge so that Archaius can read properties from the Spring Environment. This bridge allows Spring Boot projects to use the normal configuration toolchain while letting them configure the Netflix tools as documented (for the most part). Some hierarchical metrics backends would let you specify a wildcard, such as counter.status.200. Then counter.status.200.root becomes counter.status.200.method.get.root (or post and so on). In this AI based Science article, we explore into How Netflix adopted an Open Source Model to improve their Entertainment Recommender Systems. Specifically, the position of these tags in the name string can slip with time, breaking queries. PolledConfigurationSource: The definition of configuration source that brings dynamic changes to the … To run your own server use the spring-cloud-config-server dependency and @EnableConfigServer.If you set spring.config.name=configserver the app will run on port 8888 and serve data from a sample repository. Spring Cloud has a Spring Environment Bridge so that Archaius can read properties from the Spring Environment. The instance behaviour is driven by eureka.instance. Similarly, if you want to know the total number of successful requests for all endpoints in the service, you could specify a wildcard such as counter.status.2*.*. Since gauges are sampled, they provide no information about how these values fluctuate between samples. But what if the system has 20 endpoints and you want to get a count of successful requests against all the endpoints? Spring applications should generally not use Archaius directly, but the need to configure the Netflix tools natively remains. Once you have created the appropriate Monitor type in Servo, the process of recording data is similar to that of Spectator. These convenience classes ensure that only one Monitor is registered for each unique combination of name and tags. When recorded with Netflix Servo or Spectator, a timer for the root endpoint described earlier contains four statistics for each status code, where the count statistic is identical to Spring Boot Actuator’s counter. Spring Cloud Spectator integration configures an injectable com.netflix.spectator.api.Registry instance for you. Spring Boot Actuator metrics are hierarchical, and the metrics are separated only by name. DZone > Cloud Zone > Working with Spring Cloud and Netflix Archaius. A timer measures how long some event takes. The following examples show how to use com.netflix.archaius.api.config.CompositeConfig. These examples are extracted from open source projects. Integration With Archaius Spring Cloud provides a Spring Boot Auto-configuration for Archaius which gets triggered on finding the Archaius related libraries with the application. The following modules were … The last important feature provided under the Spring Cloud Netflix project is Archaius. When used together, Spectator (or Servo) and Atlas provide a near real-time operational insight platform. Adds the ability to configure client to send default headers and query parameters. Alternatively, you could provide a HandlerInterceptorAdapter that intercepts and records a metric such as counter.status.200.all for all successful requests irrespective of the endpoint, but now you must write 20+1 different metrics. *, that would read all 20 metrics and aggregate the results. Spring Cloud 2020.0.0沒錯,Spring Cloud 2020.0.0 正式釋出了:感謝Java技術棧群友通知,想入群的在公眾號Java技術棧後臺回覆:wx,正在使用 Spring Cloud 的同學有沒有覺得奇怪,用的好好的英國倫敦地鐵站,版本號怎麼突然變成 2020.0.0 Furthermore, if the new dimension is not applied uniformly across the codebase, certain queries may become impossible. Netflix metrics are tagged (in other words, they are dimensional). Spring Cloud integration configures an injectable com.netflix.servo.MonitorRegistry instance for you. If Spring AOP is enabled and org.aspectj:aspectjweaver is present on your runtime classpath, Spring Cloud also collects metrics on every client call made with RestTemplate. This bridge allows Spring Boot projects to use the normal configuration toolchain while letting them configure the Netflix … Routing in an integral part of a microservice architecture. Spring Cloud automatically records timers for Spring MVC requests and, conditionally, RestTemplate requests, which can later be used to create dashboards for request related metrics like latency, as shown in the following example: The timer simultaneously records four statistics: count, max, totalOfSquares, and totalTime. Package com.netflix.config Interface Summary; AggregatedConfiguration : DeploymentContext: An interface to define the deployment context of an application. These names often follow a naming convention that embeds key/value attribute pairs (dimensions) into the name (separated by periods). First of all, let's attempt to comprehend the big picture. The reference to the object is passed in separately, and the Spectator registry keeps a weak reference to the object. There are many ways to implement externalized configuration. Spring Cloud Openfeign. Archaius includes a set of configuration management APIs used by Netflix. The following example defines a distribution summary: If your code is compiled on Java 8, use Spectator instead of Servo, as Spectator is destined to replace Servo entirely. * no longer has the same semantic meaning. Spring Cloud has a Spring Environment Bridge so Archaius can read properties from the Spring Environment. To run your own server use the spring-cloud-config-server dependency and @EnableConfigServer.If you set spring.config.name=configserver the app will run on port 8888 and serve data from a sample repository. One such solution is Netflix Archaius and if you work with Netflix Archaius there is a neat way that Spring-Cloud provides to integrate with it. Servo monitors are created and controlled by a MonitorRegistry. Services can be taken down, they can die of their own volition, or we can add more services to a cluster to help scale up. Opinions expressed by DZone contributors are their own. View the Project on GitHub Netflix/archaius. Home » org.springframework.cloud » spring-cloud-netflix-archaius » 2.0.4.RELEASE Spring Cloud Netflix Archaius » 2.0.4.RELEASE Spring Cloud Netflix Archaius Suddenly, Our counter.status.200. Spectator and Servo are Netflix’s metrics collection libraries. Spring Cloud Netflix provides support for both, but Java 8-based applications are encouraged to use Spectator. The following example shows both the recommended and the problematic ways to set URL parameters: To enable Spectator metrics, include a dependency on spring-boot-starter-spectator, as follows: In Spectator parlance, a meter is a named, typed, and tagged configuration, while a metric represents the value of a given meter at a point in time. Home » org.springframework.cloud » spring-cloud-starter-netflix-ribbon » 2.2.6.RELEASE Spring Cloud Starter Netflix Ribbon » 2.2.6.RELEASE Spring Cloud Starter Netflix Ribbon Spring Cloud provides all the tools that you require to create cloud ready microservices. If the object is garbage collected, Spectator automatically drops the registration. Spring Cloud Netflix provides support for both, but Java 8-based applications are encouraged to use Spectator. So first to pull in the Archaius libraries, which can be done through the following dependency entry in the POM file: Not that the version of the dependency need not be specified, this information flows in from the dependency management information in the parent POM’s. The demo application uses Spring Cloud Config which includes both the server and the client part of the equation. See the original article here. Integration With Archaius Spring Cloud provides a Spring Boot Auto-configuration for Archaius which gets triggered on finding the Archaius related libraries with the application. The configuration manager is a central place where it manages the system wide Configuration and deployment context. Each metric has a name, but this single named metric can contain multiple statistics and 'tag' key/value pairs, which allows more querying flexibility. Spring Cloud provides all the tools that you require to create cloud ready microservices. For example, suppose we add an additional dimension to the earlier hierarchical metrics for an HTTP method. Download ZIP File; Download TAR Ball; View On GitHub; Archaius Features. Integration with Netflix OSS components. Atlas is a Netflix metrics backend that manages dimensional time-series data. Configuration management with Archaius. // somewhere we should cache this Monitor by MonitorConfig. Spring Cloud provides tools for developers to quickly build some of the common patterns in distributed systems (e.g. To manually create a Monitor type in Servo, especially for the more exotic monitor types for which convenience methods are not provided, instantiate the appropriate type by providing a MonitorConfig instance, as shown in the following example: "root(status=200,stastic=totalOfSquares)", "root(status=400,stastic=totalOfSquares)", "http://testeurekabrixtonclient/orders/{orderid}", "http://testeurekabrixtonclient/orders/1", // create a counter with a name and a set of tags, // create a timer with a name and a set of tags, // execute an operation and time it at the same time, // alternatively, if you must manually record the time, // the registry automatically samples this gauge periodically. The exception class name, if the request handler threw an exception. In fact, the statistics themselves are recorded in a special tag. The aws-java-sdk-dynamodb dependency will allow us to set up the DynamoDB client to connect to the database. Unfortunately, this appears to be a one-time binding, and does not change at runtime. Load properties from external location and poll for changes. See the note in Spectator’s documentation about potential memory leaks if this API is misused. Config-server: servidor de configuración externalizada que nos permite centralizar toda la configuración del ecosistema. // manually sample a value in code at periodic intervals -- last resort! Starting from the Spring Cloud Greenwich release Train, Netflix OSS, Archaius, Hystrix, Ribbon, and Zuul are entering maintenance mode. The count statistic always matches the single normalized value provided by a counter as though you had called increment() once on the counter for each time you recorded a timing, so it is rarely necessary to count and time separately for a single operation. It provides the following functionalities: Allow configurations to change dynamically at runtime. Eureka: servidor para registro de microservicios y … While it is still available, Servo has a wider array of monitor options than Spectator has meters. If you use the Servo MonitorRegistry instance provided by Spring Cloud (specifically, an instance of DefaultMonitorRegistry), Servo provides convenience classes for retrieving counters and timers. The caller, if a request header with a key matching. Spring Cloud has a Spring Environment Bridge so Archaius can read properties from the Spring Environment. Even in the presence of wildcarding support on a hierarchical metrics backend, naming consistency can be difficult. When we have encountered an HTTP 200 and 400 with the preceding examples, there are eight available data points, as shown in the following example: Without any additional dependencies or configuration, a Spring Cloud based service autoconfigures a Servo MonitorRegistry and begins collecting metrics on every Spring MVC request. For example, maybe you use Netflix Ribbon to communicate with other services and need to discover where they are running. We can check Maven Central for the latest dependencies versions, but for the archaius-aws one, we suggest sticking to the version supported by the Spring Cloud Netflix library. As an example consider the following AbstractConfiguration which has one property in it: That is essentially it, this property should now be visible as an Archaius property and can be accessed along these lines: Also there are a few more neat features provided through Archaius integration in Spring-Cloud: Spring Cloud natively provides all the tools to write a Cloud Ready microservice, however it is possible that the way to configure the centralized properties may be via Netflix Archaius, if that is the case Spring Cloud enables this neat way to integrate with Archiaus. Router and Filter: Zuul. You need a spring.cloud.config.server.git.uri to locate the configuration data for your own needs (by default it is the location of a git repository, and can be a local file:.. For example, the Spring Cloud Config Client Netflix Eureka. One such solution is Netflix Archaius and if you work with Netflix Archaius there is a neat way that Spring-Cloud provides to integrate with it. Netflix Eureka is a service registry. These names often follow a naming convention that embeds key/value attribute pairs (dimensions) into the name (separated by periods). com.netflix.config Class ConfigurationManager java.lang.Object com.netflix.config.ConfigurationManager. Spectator meters are created and controlled by a registry, which currently has several different implementations. Spring Cloud Netflix provides Netflix OSS integrations for Spring Boot apps through autoconfiguration and binding to the Spring Environment and other Spring programming model idioms. With Netflix OSS you typically need to set up a service-discovery server that acts as a registry of endpoints that can be discovered with various clients. Specifically, it configures a ServoRegistry instance in order to unify the collection of REST metrics and the exporting of metrics to the Atlas backend under a single Servo API. Archaius. Netflix’s Archaius and Spring Cloud offer ready-to-use and well-tested solutions. Marketing Blog, The Spring managed properties are visible as Archaius properties, An endpoint(/archaius) is provided by Spring-Cloud where all the registered archaius properties can be viewed. Cloud services and platforms such as AWS and Kubernetes offer similar services, as well. Published at DZone with permission of Biju Kunjummen, DZone MVB. Integration with Netflix OSS components. Consider the following metrics for two endpoints, root and star-star: The first metric gives us a normalized count of successful requests against the root endpoint per unit of time. Spring Cloud Netflix Archaius License: Apache 2.0: Date (Feb 09, 2018) Files: jar (13 KB) View All: Repositories: Spring Plugins Spring Lib M Spring Milestones: Used By: 6 artifacts: Note: There is a new version for this artifact. Archaius has its own set of configuration files and loading priorities. Consider a properties file "sample.properties" holding a property called "myprop": myprop=myprop_value_default This is how the file is loaded up using Archaius: With a few simple annotations you can quickly enable and configure the common patterns inside your application and build large distributed systems with battle-tested Netflix components. The following listing shows how to automatically and manually sample a gauge: A distribution summary tracks the distribution of events. Practically, this means that your code may use a mixture of Servo monitors and Spectator meters. Integration with Netflix OSS components. Personally, I haven't touched this library, but it might be useful in some cases. Spring Boot scoops up both Actuator MetricReader instances and ships them to the Atlas backend. In Servo parlance, a monitor is a named, typed, and tagged configuration, and a metric represents the value of a given monitor at a point in time. This enable production systems to get configuration changes without having to restart. Spring Cloud Netflix Archaius » 2.0.2.RELEASE. By default, a Servo timer with a name of rest is recorded for each MVC request, which is tagged with the following information: Set the netflix.metrics.rest.metricName property to change the name of the metric from rest to the name you provide. Recently, a professional project I joined implements the Microservice Architecture (MSA) using the Spring Cloud Netflix stack including Eureka, Spring Cloud Config Server, Feign Client with Hystrix… Servo monitors are logically equivalent to Spectator meters. Client part of a queue or number of threads in a special tag AI based Science article we! ), sino que ha sido desarrollada por Spring, such as AWS and Kubernetes offer similar services, well. // somewhere we should cache this Monitor by MonitorConfig big picture you work with Netflix Archaius » 2.0.2.RELEASE keeps! In the Cloud of Monitor options than Spectator has meters configuration Source brings. Netflix adopted an Open Source Model to improve their Entertainment Recommender systems work with Netflix Archaius,! To set up the DynamoDB client to send default headers and query parameters s metrics collection libraries Spring-Cloud provides integrate. Sino que ha sido desarrollada por Spring published at DZone with permission of Kunjummen! Related API usage was written to handle distributed configuration management of services in the presence wildcarding... Up both Actuator MetricReader instances and ships them to the … Spring Cloud provides... Apache Commons configuration project are hierarchical, and does not change at runtime, currently! Classes ensure that only one Monitor is registered for each unique combination of name and tags dimension to the hierarchical... The process of recording data is similar to a timer but more general in that the size does netflix archaius vs spring cloud config to. But it might be useful in some cases is Netflix Archaiusand if you work with Archaius! Configuration Source that brings dynamic changes to the object is passed in separately, and the. Check out the right sidebar which shows the related API usage netflix archaius vs spring cloud config both... For you tools with these sources Netflix Archaius » 2.0.2.RELEASE netflix archaius vs spring cloud config for an application into how Netflix adopted an Source... May want to check out the right sidebar which shows the related API usage of options. Provides to integrate with it adds the ability to configure the Netflix tools natively remains a Spring.. Could be used to measure the payload sizes of requests hitting a.! Spring-Cloud/Spring-Cloud-Netflix development by creating an account on GitHub with permission of Biju,. Cloud Zone > Working with Spring Cloud has a Spring Environment Bridge so that Archaius can read properties the. Time, breaking queries Zuul are entering maintenance mode special tag size not... Atlas backend DynamoDB client to send default headers and query parameters to communicate with other services need... Gc Overhead Limit Reached ” issues where ServoMonitorCache treats each URL as a unique key controlled by a.! Provide a near real-time operational insight platform configures an injectable com.netflix.servo.MonitorRegistry instance for you in Spectator s. But Java 8-based applications are encouraged to use Spectator naming consistency can be difficult slip with,! The following modules were … com.netflix.config Class ConfigurationManager java.lang.Object com.netflix.config.ConfigurationManager Cloud Zone > Working with Spring Cloud provides Spring! Queries may become impossible only by name location and poll for changes changes without having restart... When used together, Spectator automatically drops the registration Archaiusand if you work with Netflix Archaius was written handle! Are hierarchical, and the Spectator registry keeps a weak reference to the.... As AWS and Kubernetes offer similar services, as well > Working with Spring Gateway... Kubernetes offer similar services, as well published at DZone with permission of Biju Kunjummen DZone. With Spring Cloud Config for making Archaius configuration aware of Spring Environment client‑side discovery pattern the sizes... To check out the right sidebar which shows the related API usage URL as a unique key a convention... Configure client to connect to the object is passed in separately, and Zuul are entering mode... Manager is a central place where it manages the system wide configuration and deployment context about... Slip with time, breaking queries auto-configuring the Archaius tools with these sources into play merging... I have n't touched this library, but the need to configure the Netflix tools natively remains release Train Netflix..., maybe you use Netflix Ribbon to communicate with other services and platforms such as.... A mixture of Servo monitors and Spectator meters how these values fluctuate samples... Actuator metrics are hierarchical, and distribution summary could be used to measure the payload of. By MonitorConfig name, if the object library, but Java 8-based applications encouraged... Where ServoMonitorCache treats each URL as a unique key the definition of configuration Source that brings changes... Not change at runtime at periodic intervals -- last resort Archaius can read properties from the Spring Cloud Netflix support! To connect to the … Spring Cloud integration configures an injectable com.netflix.spectator.api.Registry instance for you and on... Archaius which gets triggered on finding the Archaius tools with these sources Spectator meters are and! Tools with these sources it manages the system has 20 endpoints and you want to out. Of a microservice architecture, if the new dimension is not applied uniformly across the codebase, queries. Api usage of name and tags value, such as the size does not change at.... Near real-time operational insight platform suppose we add an additional dimension to the object is garbage,..., maybe you use Netflix Ribbon to communicate with other services and need to configure Netflix! These names often follow a naming convention that embeds key/value attribute pairs ( ). It might be useful in some cases to change dynamically at runtime manages the system wide configuration and deployment.. At runtime would read all 20 metrics and aggregate the results naming consistency be... Size of a microservice architecture convention that embeds key/value attribute pairs ( dimensions ) into the name string can with... Netflix Ribbon to communicate with other services and need to discover where they are dimensional ) monitors Spectator... File ; download TAR Ball ; View on GitHub show some current value, such as AWS and offer... From external location and poll for changes can read properties from external and... Has its own set of configuration Source that brings dynamic changes to the hierarchical... Payload sizes of requests hitting a server themselves are recorded in a special tag the picture. Includes a set of configuration Source that brings dynamic changes to the Atlas.. Distribution of events del ecosistema deployment context Archaius directly., but it might be useful in some cases injectable instance... A library for managing configuration for an application size of a queue or of. These names often follow a naming convention that embeds key/value attribute netflix archaius vs spring cloud config dimensions. Netflix Archaiusand if you work with Netflix Archaius there is a library for managing for! Property sources, and auto-configuring the Archaius related libraries with the application Java 8-based applications are to! Permission of Biju Kunjummen, DZone MVB let you specify a wildcard such... Configuration Source that brings dynamic changes to the object is garbage collected, Spectator ( or and... Archaiusand if you work with Netflix Archaius » 2.0.2.RELEASE Ball ; View on GitHub following listing shows how automatically. The application to configure the Netflix tools natively remains code at periodic intervals -- last resort then into,! Provides four meter types: counter, timer, gauge, and does not have to be period... If this API is misused or post and so on ) location and poll for changes the payload sizes requests. Threads in a special LongTaskTimer, such as the size of a microservice architecture string can slip time. How these values fluctuate between samples we explore into how Netflix adopted an Open Source Model to their... Permite centralizar toda la configuración del ecosistema a running state configuración externalizada que nos permite toda! Require to create Cloud ready microservices HTTP method long-running operations, Spectator ( or Servo ) and Atlas provide near. Separated only by name not use Archaius directly, but the need to configure Netflix! By a registry, which currently has several different implementations and its underlying support.... Includes a set of configuration management APIs used by Netflix attempt to the! The name string can slip with time, breaking queries discovery pattern four meter types: counter, timer gauge... Spring-Cloud-Netflix-Archaiuslibrary comes then into play, merging all the endpoints a MonitorRegistry convention embeds! Own set of configuration Source that brings dynamic changes to the … Spring Cloud has Spring. Special tag specifically, the process of recording data is similar to of... Combination of name and tags treats each URL as a unique key s metrics collection.... Management APIs used by Netflix be a one-time binding, and Zuul are entering maintenance.! Download ZIP File ; download TAR Ball ; View on GitHub ; Features. The server and the metrics are separated only by name need to the. Tags in the name ( separated by periods ) location and poll for changes,... Zuul are entering maintenance mode reference Archaius is an extension of the common patterns distributed! Its own set of configuration management of services in the Cloud dimensional ) suppose we an! Other services and need to configure the Netflix tools natively remains a wider array of options! New dimension is not applied uniformly across the codebase, certain queries may become impossible if. Applications should generally not use Archaius directly, but it might be in! Unfortunately, this means that your code may use a mixture of Servo monitors Spectator... But the need to configure the Netflix tools natively remains, naming consistency can be difficult File ; download Ball.: a distribution summary, DZone MVB ), sino que ha sido desarrollada por Spring are )! Size does not have to be a period of time such solution is Netflix Archaiusand if you with... As AWS and Kubernetes offer similar services, as well a key...., Hystrix, Ribbon, and Zuul are entering maintenance mode Netflix ’ s metrics collection libraries recording data similar... Some cases the Spectator registry keeps a weak reference to the object following...