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Add change logs for 8.2.0 (#5697)

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吴晟 Wu Sheng 2020-10-20 20:06:23 +08:00 committed by GitHub
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==================
Release Notes.
8.1.0
8.2.0
------------------
#### Project
* Support Kafka as an optional trace, JVM metrics, profiling snapshots and meter system data transport layer.
* Support Meter system, including the native metrics APIs and the Spring Sleuth adoption.
* Support JVM thread metrics.
* Support Browser monitoring.
* Add e2e test for ALS solution of service mesh observability.
* Support compiling(include testing) in JDK11.
* Support build a single module.
#### Java Agent
* [**Core**] Fix the concurrency access bug in the Concurrency ClassLoader Case.
* [**Core**] Separate the config of the plugins from the core level.
* [**Core**] Support instrumented class cached in memory or file, to be compatible with other agents, such as Arthas.
* Add logic endpoint concept. Could analysis any span or tags flagged by the logic endpoint.
* Add Spring annotation component name for UI visualization only.
* Add support to trace `Call procedures` in MySQL plugin.
* Support GraphQL plugin.
* Support Quasar fiber plugin.
* Support InfluxDB java client plugin.
* Support brpc java plugin
* Support `ConsoleAppender` in the logback v1 plugin.
* Enhance vert.x endpoint names.
* Optimize the code to prevent mongo statements from being too long.
* Fix WebFlux plugin concurrency access bug.
* Fix ShardingSphere plugins internal conflicts.
* Fix duplicated Spring MVC endpoint.
* Fix lettuce plugin sometimes trace doesn‘t show span layer.
* Fix `@Tag` returnedObject bug.
* Support metrics plugin.
* Support slf4j logs of gRPC and Kafka(when agent uses them) into the agent log files.
* Add `PROPERTIES_REPORT_PERIOD_FACTOR` config to avoid the properties of instance cleared.
* Limit the size of traced SQL to avoid OOM.
* Support `mount` command to load a new set of plugins.
* Add plugin selector mechanism.
* Enhance the witness classes for MongoDB plugin.
* Enhance the parameter truncate mechanism of SQL plugins.
* Enhance the SpringMVC plugin in the reactive APIs.
* Enhance the SpringMVC plugin to collect HTTP headers as the span tags.
* Enhance the Kafka plugin, about `@KafkaPollAndInvoke`
* Enhance the configuration initialization core. Plugin could have its own plugins.
* Enhance Feign plugin to collect parameters.
* Enhance Dubbo plugin to collect parameters.
* Provide Thrift plugin.
* Provide XXL-job plugin.
* Provide MongoDB 4.x plugin.
* Provide Kafka client 2.1+ plugin.
* Provide WebFlux-WebClient plugin.
* Provide ignore-exception plugin.
* Provide quartz scheduler plugin.
* Provide ElasticJob 2.x plugin.
* Provide Spring @Scheduled plugin.
* Provide Spring-Kafka plugin.
* Provide HBase client plugin.
* Provide JSON log format.
* Move Spring WebFlux plugin to the optional plugin.
* Fix inconsistent logic bug in PrefixMatch
* Fix duplicate exit spans in Feign LoadBalancer mechanism.
* Fix the target service blocked by the Kafka reporter.
* Fix configurations of Kafka report don't work.
* Fix rest template concurrent conflict.
* Fix NPE in the ActiveMQ plugin.
* Fix conflict between Kafka reporter and sampling plugin.
* Fix NPE in the log formatter.
* Fix span layer missing in certain cases, in the Kafka plugin.
* Fix error format of time in serviceTraffic update.
* Upgrade bytebuddy to 1.10.14
#### OAP-Backend
* Support Jetty Server advanced configurations.
* Support label based filter in the prometheus fetcher and OpenCensus receiver.
* Support using k8s configmap as the configuration center.
* Support OAP health check, and storage module health check.
* Support sampling rate in the dynamic configuration.
* Add `endpoint_relation_sla` and `endpoint_relation_percentile` for endpoint relationship metrics.
* Add components for Python plugins, including Kafka, Tornado, Redis, Django, PyMysql.
* Add components for Golang SDK.
* Add Nacos 1.3.1 back as an optional cluster coordinator and dynamic configuration center.
* Enhance the metrics query for ElasticSearch implementation to increase the stability.
* Reduce the length of storage entity names in the self-observability for MySQL and TiDB storage.
* Fix labels are missing in Prometheus analysis context.
* Fix column length issue in MySQL/TiDB storage.
* Fix no data in 2nd level aggregation in self-observability.
* Fix searchService bug in ES implementation.
* Fix wrong validation of endpoint relation entity query.
* Fix the bug caused by the OAL debug flag.
* Fix endpoint dependency bug in MQ and uninstrumented proxy cases.
* Fix time bucket conversion issue in the InfluxDB storage implementation.
* Update k8s client to 8.0.0
* Support Nacos authentication.
* Support labeled meter in the meter receiver.
* Separate UI template into multiple files.
* Provide support for Envoy tracing. Envoy tracer depends on the Envoy community.
* Support query trace by tags.
* Support composite alarm rules.
* Support alarm messages to DingTalk.
* Support alarm messages to WeChat.
* Support alarm messages to Slack.
* Support SSL for Prometheus fetcher and self telemetry.
* Support labeled histogram in the prometheus format.
* Support the status of segment based on entry span or first span only.
* Support the error segment in the sampling mechanism.
* Support SSL certs of gRPC server.
* Support labeled metrics in the alarm rule setting.
* Support to query all labeled data, if no explicit label in the query condition.
* Add TLS parameters in the mesh analysis.
* Add health check for InfluxDB storage.
* Add `super dataset` concept for the traces/logs.
* Add separate replicas configuration for super dataset.
* Add `IN` operator in the OAL.
* Add `!=` operator in the OAL.
* Add `like` operator in the OAL.
* Add `latest` function in the prometheus analysis.
* Add more configurations in the gRPC server.
* Optimize the trace query performance.
* Optimize the CPU usage rate calculation, at least to be 1.
* Optimize the length of slow SQL column in the MySQL storage.
* Optimize the topology query, use client side component name when no server side mapping.
* Add component IDs for Python component.
* Add component ID range for C++.
* Fix Slack notification setting NPE.
* Fix some module missing check of the module manager core.
* Fix authentication doesn't work in sharing server.
* Fix metrics batch persistent size bug.
* Fix trace sampling bug.
* Fix CLR receiver bug.
* Fix end time bug in the query process.
* Fix `Exporter INCREMENT mode` is not working.
* Fix an error when executing startup.bat when the log directory exists
#### UI
* Support endpoint dependency graph.
* Support x-scroll of trace/profile page
* Fix database selector issue.
* Add the bar chart in the UI templates.
* Add browser dashboard.
* Add browser log query page.
* Support query trace by tags.
* Fix JVM configuration.
* Fix CLR configuration.
#### Document
* Update the user logo wall.
* Add backend configuration vocabulary document.
* Add agent installation doc for Tomcat9 on Windows.
* Add istioctl ALS commands for the document.
* Fix TTL documentation.
* Add FAQ doc about thread instrumentation.
* Add the document about `SW_NO_UPSTREAM_REAL_ADDRESS`.
* Update ALS setup document.
* Add Customization Config section for plugin development.
#### CVE
* Fix fuzzy query sql injection in the MySQL/TiDB storage.
All issues and pull requests are [here](https://github.com/apache/skywalking/milestone/52?closed=1)
All issues and pull requests are [here](https://github.com/apache/skywalking/milestone/56?closed=1)
8.0.1
------------------
#### OAP-Backend
* Fix `no-init` mode is not working in ElasticSearch storage.
8.0.0
------------------
#### Project
* v3 protocol is added and implemented. All previous releases are incompatible with 8.x releases.
* Service, Instance, Endpoint register mechanism and inventory storage entities are removed.
* New GraphQL query protocol is provided, the legacy procotol is still supported(plan to remove at the end of this year).
* Support Prometheus network protocol. Metrics in Prometheus format could be transferred into SkyWalking.
* Python agent provided.
* All inventory caches have been removed.
* Apache ShardingSphere(4.1.0, 4.1.1) agent plugin provided.
#### Java Agent
* Add MariaDB plugin.
* Vert.x plugin enhancement. More cases are covered.
* Support v3 extension header.
* Fix ElasticSearch 5.x plugin TransportClient error.
* Support Correlation protocol v1.
* Fix Finagle plugin bug, in processing Noop Span.
* Make `CommandService` daemon to avoid blocking target application shutting down gracefully.
* Refactor spring cloud gateway plugin and support tracing spring cloud gateway 2.2.x
#### OAP-Backend
* Support meter system for Prometheus adoption. In future releases, we will add native meter APIs and MicroMeter(Sleuth) system.
* Support endpoint grouping.
* Add **SuperDataSet** annotation for storage entity.
* Add **superDatasetIndexShardsFactor** in the ElasticSearch storage, to provide more shards for @SuperDataSet annotated entites. Typically TraceSegment.
* Support alarm settings for relationship of service, instance, and endpoint level metrics.
* Support alarm settings for database(conjecture node in tracing scenario).
* Data Model could be added in the runtime, don't depend on the bootstrap sequence anymore.
* Reduce the memory cost, due to no inventory caches.
* No buffer files in tracing and service mesh cases.
* New ReadWriteSafe cache implementation. Simplify codes.
* Provide default way for metrics query, even the metrics doesn't exist.
* New GraphQL query protocol is provided. Support the metrics type query.
* Set up length rule of service, instance, and endpoint.
* Adjust the default jks for ElasticSearch to empty.
* Fix Apdex function integer overflow issue.
* Fix profile storage issue.
* Fix TTL issue.
* Fix H2 column type bug.
* Add JRE 8-14 test for the backend.
#### UI
* UI dashboard is 100% configurable to adopt new metrics definited in the backend.
#### Document
* Add v8 upgrade document.
* Make the coverage accurate including UT and e2e tests.
* Add miss doc about collecting parameters in the profiled traces.
#### CVE
* Fix SQL Injection vulnerability in H2/MySQL implementation.
* Upgrade Nacos to avoid the FastJson CVE in high frequency.
* Upgrade jasckson-databind to 2.9.10.
All issues and pull requests are [here](https://github.com/apache/skywalking/milestone/45?closed=1)
7.0.0 release
------------------
You could find all CHANGES of 7.0.0 at [here](https://github.com/apache/skywalking/blob/v7.0.0/CHANGES.md)
6.x releases
------------------
You could find all CHANGES of 6.x at [here](https://github.com/apache/skywalking/blob/6.x/CHANGES.md)
5.x releases
------------------
You could find all CHANGES of 5.x at [here](https://github.com/apache/skywalking/blob/5.x/CHANGES.md)
Find change logs of all versions [here](changes).

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5.1.0
------------------
#### Agent Changes
- Fix spring inherit issue in another way
- Fix classloader dead lock in jdk7+ - 5.x
- Support Spring mvc 5.x
- Support Spring webflux 5.x
#### Collector Changes
- Fix too many open files.
- Fix the buffer file cannot delete.
5.0.0-GA
------------------
#### Agent Changes
- Add several package names ignore in agent settings. Classes in these packages would be enhanced, even plugin declared.
- Support Undertow 2.x plugin.
- Fix wrong class names of Motan plugin, not a feature related issue, just naming.
#### Collector Changes
- Make buffer file handler close more safety.
- Fix NPE in AlarmService
#### Documents
- Fix compiling doc link.
- Update new live demo address.
5.0.0-RC2
------------------
#### Agent Changes
- Support ActiveMQ 5.x
- Support RuntimeContext used out of TracingContext.
- Support Oracle ojdbc8 Plugin.
- Support ElasticSearch client transport 5.2-5.6 Plugin
- Support using agent.config with given path through system properties.
- Add a new way to transmit the Request and Response, to avoid bugs in Hytrix scenarios.
- Fix HTTPComponent client v4 operation name is empty.
- Fix 2 possible NPEs in Spring plugin.
- Fix a possible span leak in SpringMVC plugin.
- Fix NPE in Spring callback plugin.
#### Collector Changes
- Add GZip support for Zipkin receiver.
- Add new component IDs for nodejs.
- Fix Zipkin span receiver may miss data in request.
- Optimize codes in heatmap calculation. Reduce unnecessary divide.
- Fix NPE in Alarm content generation.
- Fix the precision lost in `ServiceNameService#startTimeMillis`.
- Fix GC count is 0.
- Fix topology breaks when RPC client uses the async thread call.
#### UI Changes
- Fix UI port can't be set by startup script in Windows.
- Fix Topology self link error.
- Fix stack color mismatch label color in gc time chart.
#### Documents
- Add users list.
- Fix several document typo.
- Sync the Chinese documents.
- Add OpenAPM badge.
- Add icon/font documents to NOTICE files.
[Issues and Pull requests](https://github.com/apache/incubator-skywalking/milestone/27?closed=1)
5.0.0-beta2
------------------
#### UI -> Collector GraphQL query protocol
- Add order and status in trace query.
#### Agent Changes
- Add SOFA plugin.
- Add witness class for Kafka plugin.
- Add RuntimeContext in Context.
- Fix RuntimeContext fail in Tomcat plugin.
- Fix incompatible for `getPropertyDescriptors` in Spring core.
- Fix spymemcached plugin bug.
- Fix database URL parser bug.
- Fix `StringIndexOutOfBoundsException` when mysql jdbc url without databaseName。
- Fix duplicate slash in Spring MVC plugin bug.
- Fix namespace bug.
- Fix NPE in Okhttp plugin when connect failed.
- FIx `MalformedURLException` in httpClientComponent plugin.
- Remove unused dependencies in Dubbo plugin.
- Remove gRPC timeout to avoid out of memory leak.
- Rewrite Async http client plugin.
- [Incubating] Add trace custom ignore optional plugin.
#### Collector Changes
- Topology query optimization for more than 100 apps.
- Error rate alarm is not triggered.
- Tolerate unsupported segments.
- Support Integer Array, Long Array, String Array, Double Array in streaming data model.
- Support multiple entry span and multiple service name in one segment durtaion record.
- Use BulkProcessor to control the linear writing of data by multiple threads.
- Determine the log is enabled for the DEBUG level before printing message.
- Add `static` modifier to Logger.
- Add AspNet component.
- Filter inactive service in query.
- Support to query service based on Application.
- Fix `RemoteDataMappingIdNotFoundException`
- Exclude component-libaries.xml file in collector-*.jar, make sure it is in `/conf` only.
- Separate a single TTL in minute to in minute, hour, day, month metric and trace.
- Add order and status in trace query.
- Add folder lock to buffer folder.
- Modify operationName search from `match` to `match_phrase`.
- [Incubating] Add Zipkin span receiver. Support analysis Zipkin v1/v2 formats.
- [Incubating] Support sharding-sphere as storage implementor.
#### UI Changes
- Support login and access control.
- Add new webapp.yml configuration file.
- Modify webapp startup script.
- Link to trace query from Thermodynamic graph
- Add application selector in service view.
- Add order and status in trace query.
#### Documents
- Add architecture design doc.
- Reformat deploy document.
- Adjust Tomcat deploy document.
- Remove all Apache licenses files in dist release packages.
- Update user cases.
- Update UI licenses.
- Add incubating sections in doc.
[Issues and Pull requests](https://github.com/apache/incubator-skywalking/milestone/28?closed=1)
5.0.0-beta
------------------
#### UI -> Collector GraphQL query protocol
- Replace all tps to throughtput/cpm(calls per min)
- Add `getThermodynamic` service
- Update version to beta
#### Agent Changes
- Support TLS.
- Support namespace.
- Support direct link.
- Support token.
- Add across thread toolkit.
- Add new plugin extend machenism to override agent core implementations.
- Fix an agent start up sequence bug.
- Fix wrong gc count.
- Remove system env override.
- Add Spring AOP aspect patch to avoid aop conflicts.
#### Collector Changes
- Trace query based on timeline.
- Delete JVM aggregation in second.
- Support TLS.
- Support namespace.
- Support token auth.
- Group and aggregate requests based on reponse time and timeline, support Thermodynamic chart query
- Support component librariy setting through yml file for better extendibility.
- Optimize performance.
- Support short column name in ES or other storage implementor.
- Add a new cache module implementor, based on **Caffeine**.
- Support system property override settings.
- Refactor settings initialization.
- Provide collector instrumentation agent.
- Support .NET core component libraries.
- Fix `divide zero` in query.
- Fix `Data don't remove as expected` in ES implementor.
- Add some checks in collector modulization core.
- Add some test cases.
#### UI Changes
- New trace query UI.
- New Application UI, merge server tab(removed) into applciation as sub page.
- New Topology UI.
- New response time / throughput TopN list.
- Add Thermodynamic chart in overview page.
- Change all tps to cpm(calls per minutes).
- Fix wrong osName in server view.
- Fix wrong startTime in trace view.
- Fix some icons internet requirements.
#### Documents
- Add TLS document.
- Add namespace document.
- Add direct link document.
- Add token document.
- Add across thread toolkit document.
- Add a FAQ about, `Agent or collector version upgrade`.
- Sync all English document to Chinese.
[Issues and Pull requests](https://github.com/apache/incubator-skywalking/milestone/24?closed=1)
5.0.0-alpha
------------------
#### Agent -> Collector protocol
- Remove C++ keywords
- Move **Ref** into Span from Segment
- Add span type, when register an operation
#### UI -> Collector GraphQL query protocol
- First version protocol
#### Agent Changes
- Support gRPC 1.x plugin
- Support kafka 0.11 and 1.x plugin
- Support ServiceComb 0.x plugin
- Support optional plugin mechanism.
- Support Spring 3.x and 4.x bean annotation optional plugin
- Support Apache httpcomponent AsyncClient 4.x plugin
- Provide automatic agent daily tests, and release reports [here](https://github.com/SkywalkingTest/agent-integration-test-report).
- Refactor Postgresql, Oracle, MySQL plugin for compatible.
- Fix jetty client 9 plugin error
- Fix async APIs of okhttp plugin error
- Fix log config didn't work
- Fix a class loader error in okhttp plugin
#### Collector Changes
- Support metrics analysis and aggregation for application, application instance and service in minute, hour, day and month.
- Support new GraphQL query protocol
- Support alarm
- Provide a prototype instrument for collector.
- Support node speculate in cluster and application topology. (Provider Node -> Consumer Node) -> (Provider Node -> MQ Server -> Consumer Node)
#### UI Changes
- New 5.0.0 UI!!!
[Issues and Pull requests](https://github.com/apache/incubator-skywalking/milestone/17?closed=1)

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6.6.0
------------------
#### Project
- [**IMPORTANT**] Local span and exit span are not treated as endpoint detected at client and local. Only entry span is the endpoint. Reduce the load of register and memory cost.
* Support MiniKube, Istio and SkyWalking on K8s deployment in CI.
* Support Windows and MacOS build in GitHub Action CI.
* Support ElasticSearch 7 in official dist.
* Hundreds plugin cases have been added in GitHub Action CI process.
#### Java Agent
* Remove the local/exit span operation name register mechanism.
* Add plugin for JDK Threading classes.
* Add plugin for Armeria.
* Support set operation name in async span.
* Enhance webflux plugin, related to Spring Gateway plugin. Webflux plugin is in optional, due to JDK8 required.
* Fix a possible deadlock.
* Fix NPE when OAL scripts are different in different OAP nodes, mostly in upgrading stage.
* Fix bug about wrong peer in ES plugin.
* Fix NPE in Spring plugin.
* Fix wrong class name in Dubbo 2.7 conflict patch.
* Fix spring annotation inheritance problem.
#### OAP-Backend
* Remove the local/exit span operation name register mechanism.
* Remove client side endpoint register in service mesh.
* Service instance dependency and related metrics.
* Support `min` func in OAL
* Support `apdex` func in OAL
* Support custom ES config setting at the index level.
* Envoy ALS proto upgraded.
* Update JODA lib as bugs in UTC +13/+14.
* Support topN sample period configurable.
* Ignore no statement DB operations in slow SQL collection.
* Fix bug in docker-entrypoint.sh when using MySQL as storage
#### UI
* Service topology enhancement. Dive into service, instance and endpoint metrics on topo map.
* Service instance dependency view and related metrics.
* Support using URL parameter in trace query page.
* Support apdex score in service page.
* Add service dependency metrics into metrics comparison.
* Fix alarm search not working.
#### Document
* Update user list and user wall.
* Add document link for CLI.
* Add deployment guide of agent in Jetty case.
* Modify Consul cluster doc.
* Add document about injecting traceId into the logback with logstack in JSON format.
* ElementUI license and dependency added.
All issues and pull requests are [here](https://github.com/apache/skywalking/milestone/37?closed=1)
6.5.0
------------------
#### Project
- TTL E2E test (#3437)
- Test coverage is back in pull request check status (#3503)
- Plugin tests begin to be migrated into main repo, and is in process. (#3528, #3756, #3751, etc.)
- Switch to SkyWalking CI (exclusive) nodes (#3546)
- MySQL storage e2e test. (#3648)
- E2E tests are verified in multiple jdk versions, jdk 8, 9, 11, 12 (#3657)
- Jenkins build jobs run only when necessary (#3662)
#### OAP-Backend
- Support dynamically configure alarm settings (#3557)
- Language of instance could be null (#3485)
- Make query max window size configurable. (#3765)
- Remove two max size 500 limit. (#3748)
- Parameterize the cache size. (#3741)
- ServiceInstanceRelation set error id (#3683)
- Makes the scope of alarm message more semantic. (#3680)
- Add register persistent worker latency metrics (#3677)
- Fix more reasonable error (#3619)
- Add GraphQL getServiceInstance instanceUuid field. (#3595)
- Support namespace in Nacos cluster/configuration (#3578)
- Instead of datasource-settings.properties, use application.yml for MySQLStorageProvider (#3564)
- Provide consul dynamic configuration center implementation (#3560)
- Upgrade guava version to support higher jdk version (#3541)
- Sync latest als from envoy api (#3507)
- Set telemetry instanced id for Etcd and Nacos plugin (#3492)
- Support timeout configuration in agent and backend. (#3491)
- Make sure the cluster register happens before streaming process. (#3471)
- Agent supports custom properties. (#3367)
- Miscellaneous bug fixes (#3567)
#### UI
- Feature: node detail display in topo circle-chart view.
- BugFix: the jvm-maxheap & jvm-maxnonheap is -1, free is no value
- Fix bug: time select operation not in effect
- Fix bug: language initialization failed
- Fix bug: not show instance language
- Feature: support the trace list display export png
- Feature: Metrics comparison view
- BugFix: Fix dashboard top throughput copy
#### Java Agent
- Spring async scenario optimize (#3723)
- Support log4j2 AsyncLogger (#3715)
- Add config to collect PostgreSQL sql query params (#3695)
- Support namespace in Nacos cluster/configuration (#3578)
- Provide plugin for ehcache 2.x (#3575)
- Supporting RequestRateLimiterGatewayFilterFactory (#3538)
- Kafka-plugin compatible with KafkaTemplate (#3505)
- Add pulsar apm plugin (#3476)
- Spring-cloud-gateway traceId does not transmit #3411 (#3446)
- Gateway compatible with downstream loss (#3445)
- Provide cassandra java driver 3.x plugin (#3410)
- Fix SpringMVC4 NoSuchMethodError (#3408)
- BugFix: endpoint grouping rules may be not unique (#3510)
- Add feature to control the maximum agent log files (#3475)
- Agent support custom properties. (#3367)
- Add Light4j plugin (#3323)
#### Document
- Remove travis badge (#3763)
- Replace user wall to typical users in readme page (#3719)
- Update istio docs according latest istio release (#3646)
- Use chart deploy sw docs (#3573)
- Reorganize the doc, and provide catalog (#3563)
- Committer vote and set up document. (#3496)
- Update als setup doc as istio 1.3 released (#3470)
- Fill faq reply in official document. (#3450)
All issues and pull requests are [here](https://github.com/apache/skywalking/milestone/36?closed=1)
6.4.0
------------------
#### Project
* Highly recommend to upgrade due to Pxx metrics calculation bug.
* Make agent working in JDK9+ Module system.
#### Java Agent
* Make agent working in JDK9+ Module system.
* Support Kafka 2.x client libs.
* Log error in OKHTTP OnFailure callback.
* Support injecting traceid into logstack appender in logback.
* Add OperationName(including endpoint name) length max threshold.
* Support using Regex to group operation name.
* Support Undertow routing handler.
* RestTemplate plugin support operation name grouping.
* Fix ClassCastException in Webflux plugin.
* Ordering zookeeper server list, to make it better in topology.
* Fix a Dubbo plugin incompatible issue.
* Fix MySQL 5 plugin issue.
* Make log writer cached.
* Optimize Spring Cloud Gateway plugin
* Fix and improve gRPC reconnect mechanism.
* Remove Disruptor dependency from agent.
#### Backend
* Fix Pxx(p50,p75,p90,p95,p99) metrics func bug.(Critical)
* Support Gateway in backend analysis, even when it doesn't have suitable language agent.
* Support using HTTPs SSL accessing ElasticSearch storage.
* Support Zookeeper ACL.
* Make alarm records listed in order.
* Fix Pxx data persistence failure in some cases.
* Fix some bugs in MySQL storage.
* Setup slow SQL length threshold.
* Fix TTL settings is not working as expected.
* Remove scope-meta file.
#### UI
* Enhance alarm page layout.
* Support trace tree chart resize.
* Support trace auto completion when partial traces abandoned somehow.
* Fix dashboard endpoint slow chart.
* Add radial chart in topology page.
* Add trace table mode.
* Fix topology page bug.
* Fix calender js bug.
* Fix "The "topo-services" component did not update the data in time after modifying the time range on the topology page.
#### Document
* Restore the broken Istio setup doc.
* Add etcd config center document.
* Correct span_limit_per_segment default value in document.
* Enhance plugin develop doc.
* Fix error description in build document.
All issues and pull requests are [here](https://github.com/apache/skywalking/milestone/35?closed=1)
6.3.0
------------------
#### Project
* e2e tests have been added, and verify every pull request.
* Use ArrayList to replace LinkedList in DataCarrier for much better performance.
* Add plugin instrumentation definition check in CI.
* DataCarrier performance improvement by avoiding false-sharing.
#### Java Agent
* Java agent supports JDK 9 - 12, but don't support Java Module yet.
* Support JVM class auto instrumentation, cataloged as bootstrap plugin.
* Support JVM HttpClient and HttpsClient plugin.[Optional]
* Support backend upgrade without rebooting required.
* Open Redefine and Retransform by other agents.
* Support Servlet 2.5 in Jetty, Tomcat and SpringMVC plugins.
* Support Spring @Async plugin.
* Add new config item to restrict the length of span#peer.
* Refactor `ContextManager#stopSpan`.
* Add gRPC timeout.
* Support Logback AsyncAppender print tid
* Fix gRPC reconnect bug.
* Fix trace segment service doesn't report `onComplete`.
* Fix wrong logger class name.
* Fix gRPC plugin bug.
* Fix `ContextManager.activeSpan()` API usage error.
#### Backend
* Support agent reset command downstream when the storage is erased, mostly because of backend upgrade.
* Backend stream flow refactor.
* High dimensionality metrics(Hour/Day/Month) are changed to lower priority, to ease the storage payload.
* Add OAP metrics cache to ease the storage query payload and improve performance.
* Remove DataCarrier in trace persistent of ElasticSearch storage, by leveraging the elasticsearch bulk queue.
* OAP internal communication protocol changed. Don't be compatible with old releases.
* Improve ElasticSearch storage bulk performance.
* Support etcd as dynamic configuration center.
* Simplify the PxxMetrics and ThermodynamicMetrics functions for better performance and GC.
* Support JVM metrics self observability.
* Add the new OAL runtime engine.
* Add gRPC timeout.
* Add Charset in the alarm web hook.
* Fix buffer lost.
* Fix dirty read in ElasticSearch storage.
* Fix bug of cluster management plugins in un-Mixed mode.
* Fix wrong logger class name.
* Fix delete bug in ElasticSearch when using namespace.
* Fix MySQL TTL failure.
* Totally remove `IDs can't be null` log, to avoid misleading.
* Fix provider has been initialized repeatedly.
* Adjust providers conflict log message.
* Fix using wrong gc time metrics in OAL.
#### UI
* Fix refresh is not working after endpoint and instance changed.
* Fix endpoint selector but.
* Fix wrong copy value in slow traces.
* Fix can't show trace when it is broken partially(Because of agent sampling or fail safe).
* Fix database and response time graph bugs.
#### Document
* Add bootstrap plugin development document.
* Alarm documentation typo fixed.
* Clarify the Docker file purpose.
* Fix a license typo.
All issues and pull requests are [here](https://github.com/apache/skywalking/milestone/34?closed=1)
6.2.0
------------------
#### Project
* ElasticSearch implementation performance improved, and CHANGED totally. Must delete all existing indexes to do upgrade.
* CI and Integration tests provided by ASF INFRA.
* Plan to enhance tests including e2e, plugin tests in all pull requests, powered by ASF INFRA.
* DataCarrier queue write index controller performance improvement. 3-5 times quicker than before.
* Add windows compile support in CI.
#### Java Agent
* Support collect SQL parameter in MySQL plugin.[Optional]
* Support SolrJ plugin.
* Support RESTEasy plugin.
* Support Spring Gateway plugin for 2.1.x[Optional]
* TracingContext performance improvement.
* Support Apache ShardingSphere(incubating) plugin.
* Support `span#error` in application toolkit.
* Fix OOM by empty stack of exception.
* FIx wrong cause exception of stack in span log.
* Fix unclear the running context in SpringMVC plugin.
* Fix CPU usage accessor calculation issue.
* Fix SpringMVC plugin span not stop bug when doing HTTP forward.
* Fix lettuce plugin async commend bug and NPE.
* Fix webflux plugin cast exception.
* [CI]Support `import` check.
#### Backend
* Support time serious ElasticSearch storage.
* Provide dynamic configuration module and implementation. Slow SQL threshold supports dynamic config today.
* Dynamic Configuration module provide multiple implementations, DCS(gRPC based), Zookeeper, Apollo, Nacos.
* Provide P99/95/90/75/50 charts in topology edge.
* New topology query protocol and implementation.
* Support Envoy ALS in Service Mesh scenario.
* Support Nacos cluster management.
* Enhance metric exporter. Run in increment and total modes.
* Fix module provider is loaded repeatedly.
* Change TOP slow SQL storage in ES to Text from Keyword, as too long text issue.
* Fix H2TopologyQuery tiny bug.
* Fix H2 log query bug.(No feature provided yet)
* Filtering pods not in 'Running' phase in mesh scenario.
* Fix query alarm bug in MySQL and H2 storage.
* Codes refactor.
#### UI
* Fix some `ID is null` query(s).
* Page refactor, especially time-picker, more friendly.
* Login removed.
* Trace timestamp visualization issue fixed.
* Provide P99/95/90/75/50 charts in topology edge.
* Change all P99/95/90/75/50 charts style. More readable.
* Fix 404 in trace page.
#### Document
* Go2Sky project has been donated to SkyAPM, change document link.
* Add FAQ for ElasticSearch storage, and links from document.
* Add FAQ fro WebSphere installation.
* Add several open users.
* Add alarm webhook document.
All issues and pull requests are [here](https://github.com/apache/skywalking/milestone/33?closed=1)
6.1.0
------------------
#### Project
**SkyWalking graduated as Apache Top Level Project**.
- Support compiling project agent, backend, UI separately.
#### Java Agent
- Support Vert.x Core 3.x plugin.
- Support Apache Dubbo plugin.
- Support `use_qualified_name_as_endpoint_name` and `use_qualified_name_as_operation_name` configs in SpringMVC plugin.
- Support span async close APIs in core. Used in Vert.x plugin.
- Support MySQL 5,8 plugins.
- Support set instance id manually(optional).
- Support customize enhance trace plugin in optional list.
- Support to set peer in Entry Span.
- Support Zookeeper plugin.
- Fix Webflux plugin created unexpected Entry Span.
- Fix Kafka plugin NPE in Kafka 1.1+
- Fix wrong operation name in postgre 8.x plugin.
- Fix RabbitMQ plugin NPE.
- Fix agent can't run in JVM 6/7, remove `module-info.class`.
- Fix agent can't work well, if there is whitespace in agent path.
- Fix Spring annotation bug and inheritance enhance issue.
- Fix CPU accessor bug.
#### Backend
**Performance improved, especially in CPU limited environment. 3x improvement in service mesh scenario(no trace) in 8C16G VM.
Significantly cost less CPU in low payload.**
- Support database metrics and SLOW SQL detection.
- Support to set max size of metadata query. And change default to 5000 from 100.
- Support ElasticSearch template for new feature in the future.
- Support shutdown Zipkin trace analysis, because it doesn't fit production environment.
- Support log type, scope HTTP_ACCESS_LOG and query. No feature provided, prepare for future versions.
- Support .NET clr receiver.
- Support Jaeger trace format, no analysis.
- Support group endpoint name by regax rules in mesh receiver.
- Support `disable` statement in OAL.
- Support basic auth in ElasticSearch connection.
- Support metrics exporter module and gRPC implementor.
- Support `>, <, >=, <=` in OAL.
- Support role mode in backend.
- Support Envoy metrics.
- Support query segment by service instance.
- Support to set host/port manually at cluster coordinator, rather than based on core settings.
- Make sure OAP shutdown when it faces startup error.
- Support set separated gRPC/Jetty ip:port for receiver, default still use core settings.
- Fix JVM receiver bug.
- Fix wrong dest service in mesh analysis.
- Fix search doesn't work as expected.
- Refactor `ScopeDeclaration` annotation.
- Refactor register lock mechanism.
- Add SmartSql component for .NET
- Add integration tests for ElasticSearch client.
- Add test cases for exporter.
- Add test cases for queue consume.
#### UI
- RocketBot UI has been accepted and bind in this release.
- Support CLR metrics.
#### Document
- Documents updated, matching Top Level Project requirement.
- UI licenses updated, according to RocketBot UI IP clearance.
- User wall and powered-by list updated.
- CN documents removed, only consider to provide by volunteer out of Apache.
All issues and pull requests are [here](https://github.com/apache/skywalking/milestone/32?closed=1)
6.0.0-GA
------------------
#### Java Agent
- Support gson plugin(optional).
- Support canal plugin.
- Fix missing ojdbc component id.
- Fix dubbo plugin conflict.
- Fix OpenTracing tag match bug.
- Fix a missing check in ignore plugin.
#### Backend
- Adjust service inventory entity, to add properties.
- Adjust service instance inventory entity, to add properties.
- Add nodeType to service inventory entity.
- Fix when operation name of local and exit spans in ref, the segment lost.
- Fix the index names don't show right in logs.
- Fix wrong alarm text.
- Add test case for span limit mechanism.
- Add telemetry module and prometheus implementation, with grafana setting.
- A refactor for register API in storage module.
- Fix H2 and MySQL endpoint dependency map miss upstream side.
- Optimize the inventory register and refactor the implementation.
- Speed up the trace buffer read.
- Fix and removed unnecessary inventory register operations.
#### UI
- Add new trace view.
- Add word-break to tag value.
#### Document
- Add two startup modes document.
- Add PHP agent links.
- Add some cn documents.
- Update year to 2019
- User wall updated.
- Fix a wrong description in `how-to-build` doc.
All issues and pull requests are [here](https://github.com/apache/skywalking/milestone/30?closed=1)
6.0.0-beta
------------------
#### Protocol
- Provide Trace Data Protocol v2
- Provide SkyWalking Cross Process Propagation Headers Protocol v2.
#### Java Agent
- Support Trace Data Protocol v2
- Support SkyWalking Cross Process Propagation Headers Protocol v2.
- Support SkyWalking Cross Process Propagation Headers Protocol v1 running in compatible way. Need declare open explicitly.
- Support SpringMVC 5
- Support webflux
- Support a new way to override agent.config by system env.
- Span tag can override by explicit way.
- Fix Spring Controller Inherit issue.
- Fix ElasticSearch plugin NPE.
- Fix agent classloader dead lock in certain situation.
- Fix agent log typo.
- Fix wrong component id in resettemplete plugin.
- Fix use transform `ignore()` in wrong way.
- Fix H2 query bug.
#### Backend
- Support Trace Data Protocol v2. And Trace Data Protocol v1 is still supported.
- Support MySQL as storage.
- Support TiDB as storage.
- Support a new way to override application.yml by system env.
- Support service instance and endpoint alarm.
- Support namespace in istio receiver.
- Support service throughput(cpm), successful rate(sla), avg response time and p99/p95/p90/p75/p50 response time.
- Support backend trace sampling.
- Support Zipkin format again.
- Support init mode.
- Support namespace in Zookeeper cluster management.
- Support consul plugin in cluster module.
- OAL generate tool has been integrated into main repo, in the maven `compile` stage.
- Optimize trace paging query.
- Fix trace query don't use fuzzy query in ElasticSearch storage.
- Fix alarm can't be active in right way.
- Fix unnecessary condition in database and cache number query.
- Fix wrong namespace bug in ElasticSearch storage.
- Fix `Remote clients selector error: / by zero `.
- Fix segment TTL is not working.
#### UI
- Support service throughput(cpm), successful rate(sla), avg response time and p99/p95/p90/p75/p50 response time.
- Fix TopN endpoint link doesn't work right.
- Fix trace stack style.
- Fix CI.
#### Document
- Add more agent setting documents.
- Add more contribution documents.
- Update user wall and powered-by page.
- Add RocketBot UI project link in document.
All issues and pull requests are [here](https://github.com/apache/skywalking/milestone/31?closed=1)
6.0.0-alpha
------------------
SkyWalking 6 is totally new milestone for the project. At this point, we are not just a distributing
tracing system with analysis and visualization capabilities. We are an **Observability Analysis Platform(OAL)**.
The core and most important features in v6 are
1. Support to collect telemetry data from different sources, such as multiple language agents and service mesh.
1. Extensible stream analysis core. Make SQL and cache analysis available in core level, although haven't
provided in this release.
1. Provide **Observability Analysis Language(OAL)** to make analysis metrics customization available.
1. New GraphQL query protocol. Not binding with UI now.
1. UI topology is better now.
1. New alarm core provided. In alpha, only on service related metrics.
All issues and pull requests are [here](https://github.com/apache/skywalking/milestone/29?closed=1)

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7.0.0
------------------
#### Project
* SkyWalking discards the supports of JDK 1.6 and 1.7 on the java agent side. The minimal requirement of JDK is JDK8.
* Support method performance profile.
* Provide new E2E test framework.
* Remove AppVeyor from the CI, use GitHub action only.
* Provide new plugin test tool.
* Don't support SkyWalking v5 agent in-wire and out-wire protocol. v6 is required.
#### Java Agent
* Add lazy injection API in the agent core.
* Support Servlet 2.5 in the Struts plugin.
* Fix RestTemplate plugin ClassCastException in the Async call.
* Add Finagle plugin.
* Add test cases of H2 and struts.
* Add Armeria 0.98 plugin.
* Fix ElasticSearch plugin bug.
* Fix EHCache plugin bug.
* Fix a potential I/O leak.
* Support Oracle SID mode.
* Update Byte-buddy core.
* Performance tuning: replace AtomicInteger with AtomicIntegerFieldUpdater.
* Add AVRO plugin.
* Update to JDK 1.8
* Optimize the ignore plugin.
* Enhance the gRPC plugin.
* Add Kotlin Coroutine plugin.
* Support HTTP parameter collection in Tomcat and SpringMVC plugin.
* Add @Tag annotation in the application toolkit.
* Move Lettuce into the default plugin list.
* Move Webflux into the default plugin list.
* Add HttpClient 3.x plugin.
#### OAP-Backend
* Support InfluxDB as a new storage option.
* Add `selector` in the `application.yml`. Make the provider activation more flexible through System ENV.
* Support sub-topology map query.
* Support gRPC SSL.
* Support HTTP protocol for agent.
* Support Nginx LUA agent.
* Support skip the instance relationship analysis if some agents doesn't have upstream address, currently for LUA agent.
* Support metrics entity name in the storage. Optional, default OFF.
* Merge the HOUR and DAY metrics into MINUTE in the ElasticSearch storage implementation. Reduce the payload for ElasticSearch server.
* Support change detection mechanism in DCS.
* Support Daily step in the ElasticSearch storage implementation for low traffic system.
* Provide profile export tool.
* Support alarm gRPC hook.
* Fix PHP language doesn't show up on the instance page.
* Add more comments in the source codes.
* Add a new metrics type, multiple linears.
* Fix thread concurrency issue in the alarm core.
#### UI
* Support custom topology definition.
#### Document
* Add FAQ about `python2` command required in the compiling.
* Add doc about new e2e framework.
* Add doc about the new profile feature.
* Powered-by page updated.
All issues and pull requests are [here](https://github.com/apache/skywalking/milestone/37?closed=1)

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8.0.0
------------------
#### Project
* v3 protocol is added and implemented. All previous releases are incompatible with 8.x releases.
* Service, Instance, Endpoint register mechanism and inventory storage entities are removed.
* New GraphQL query protocol is provided, the legacy procotol is still supported(plan to remove at the end of this year).
* Support Prometheus network protocol. Metrics in Prometheus format could be transferred into SkyWalking.
* Python agent provided.
* All inventory caches have been removed.
* Apache ShardingSphere(4.1.0, 4.1.1) agent plugin provided.
#### Java Agent
* Add MariaDB plugin.
* Vert.x plugin enhancement. More cases are covered.
* Support v3 extension header.
* Fix ElasticSearch 5.x plugin TransportClient error.
* Support Correlation protocol v1.
* Fix Finagle plugin bug, in processing Noop Span.
* Make `CommandService` daemon to avoid blocking target application shutting down gracefully.
* Refactor spring cloud gateway plugin and support tracing spring cloud gateway 2.2.x
#### OAP-Backend
* Support meter system for Prometheus adoption. In future releases, we will add native meter APIs and MicroMeter(Sleuth) system.
* Support endpoint grouping.
* Add **SuperDataSet** annotation for storage entity.
* Add **superDatasetIndexShardsFactor** in the ElasticSearch storage, to provide more shards for @SuperDataSet annotated entites. Typically TraceSegment.
* Support alarm settings for relationship of service, instance, and endpoint level metrics.
* Support alarm settings for database(conjecture node in tracing scenario).
* Data Model could be added in the runtime, don't depend on the bootstrap sequence anymore.
* Reduce the memory cost, due to no inventory caches.
* No buffer files in tracing and service mesh cases.
* New ReadWriteSafe cache implementation. Simplify codes.
* Provide default way for metrics query, even the metrics doesn't exist.
* New GraphQL query protocol is provided. Support the metrics type query.
* Set up length rule of service, instance, and endpoint.
* Adjust the default jks for ElasticSearch to empty.
* Fix Apdex function integer overflow issue.
* Fix profile storage issue.
* Fix TTL issue.
* Fix H2 column type bug.
* Add JRE 8-14 test for the backend.
#### UI
* UI dashboard is 100% configurable to adopt new metrics definited in the backend.
#### Document
* Add v8 upgrade document.
* Make the coverage accurate including UT and e2e tests.
* Add miss doc about collecting parameters in the profiled traces.
#### CVE
* Fix SQL Injection vulnerability in H2/MySQL implementation.
* Upgrade Nacos to avoid the FastJson CVE in high frequency.
* Upgrade jasckson-databind to 2.9.10.
All issues and pull requests are [here](https://github.com/apache/skywalking/milestone/45?closed=1)

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8.0.1
------------------
#### OAP-Backend
* Fix `no-init` mode is not working in ElasticSearch storage.

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8.1.0
------------------
#### Project
* Support Kafka as an optional trace, JVM metrics, profiling snapshots and meter system data transport layer.
* Support Meter system, including the native metrics APIs and the Spring Sleuth adoption.
* Support JVM thread metrics.
#### Java Agent
* [**Core**] Fix the concurrency access bug in the Concurrency ClassLoader Case.
* [**Core**] Separate the config of the plugins from the core level.
* [**Core**] Support instrumented class cached in memory or file, to be compatible with other agents, such as Arthas.
* Add logic endpoint concept. Could analysis any span or tags flagged by the logic endpoint.
* Add Spring annotation component name for UI visualization only.
* Add support to trace `Call procedures` in MySQL plugin.
* Support GraphQL plugin.
* Support Quasar fiber plugin.
* Support InfluxDB java client plugin.
* Support brpc java plugin
* Support `ConsoleAppender` in the logback v1 plugin.
* Enhance vert.x endpoint names.
* Optimize the code to prevent mongo statements from being too long.
* Fix WebFlux plugin concurrency access bug.
* Fix ShardingSphere plugins internal conflicts.
* Fix duplicated Spring MVC endpoint.
* Fix lettuce plugin sometimes trace doesn‘t show span layer.
* Fix `@Tag` returnedObject bug.
#### OAP-Backend
* Support Jetty Server advanced configurations.
* Support label based filter in the prometheus fetcher and OpenCensus receiver.
* Support using k8s configmap as the configuration center.
* Support OAP health check, and storage module health check.
* Support sampling rate in the dynamic configuration.
* Add `endpoint_relation_sla` and `endpoint_relation_percentile` for endpoint relationship metrics.
* Add components for Python plugins, including Kafka, Tornado, Redis, Django, PyMysql.
* Add components for Golang SDK.
* Add Nacos 1.3.1 back as an optional cluster coordinator and dynamic configuration center.
* Enhance the metrics query for ElasticSearch implementation to increase the stability.
* Reduce the length of storage entity names in the self-observability for MySQL and TiDB storage.
* Fix labels are missing in Prometheus analysis context.
* Fix column length issue in MySQL/TiDB storage.
* Fix no data in 2nd level aggregation in self-observability.
* Fix searchService bug in ES implementation.
* Fix wrong validation of endpoint relation entity query.
* Fix the bug caused by the OAL debug flag.
* Fix endpoint dependency bug in MQ and uninstrumented proxy cases.
* Fix time bucket conversion issue in the InfluxDB storage implementation.
* Update k8s client to 8.0.0
#### UI
* Support endpoint dependency graph.
* Support x-scroll of trace/profile page
* Fix database selector issue.
* Add the bar chart in the UI templates.
#### Document
* Update the user logo wall.
* Add backend configuration vocabulary document.
* Add agent installation doc for Tomcat9 on Windows.
* Add istioctl ALS commands for the document.
* Fix TTL documentation.
* Add FAQ doc about thread instrumentation.
#### CVE
* Fix fuzzy query sql injection in the MySQL/TiDB storage.
All issues and pull requests are [here](https://github.com/apache/skywalking/milestone/52?closed=1)

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8.2.0
------------------
#### Project
* Support Browser monitoring.
* Add e2e test for ALS solution of service mesh observability.
* Support compiling(include testing) in JDK11.
* Support build a single module.
#### Java Agent
* Support metrics plugin.
* Support slf4j logs of gRPC and Kafka(when agent uses them) into the agent log files.
* Add `PROPERTIES_REPORT_PERIOD_FACTOR` config to avoid the properties of instance cleared.
* Limit the size of traced SQL to avoid OOM.
* Support `mount` command to load a new set of plugins.
* Add plugin selector mechanism.
* Enhance the witness classes for MongoDB plugin.
* Enhance the parameter truncate mechanism of SQL plugins.
* Enhance the SpringMVC plugin in the reactive APIs.
* Enhance the SpringMVC plugin to collect HTTP headers as the span tags.
* Enhance the Kafka plugin, about `@KafkaPollAndInvoke`
* Enhance the configuration initialization core. Plugin could have its own plugins.
* Enhance Feign plugin to collect parameters.
* Enhance Dubbo plugin to collect parameters.
* Provide Thrift plugin.
* Provide XXL-job plugin.
* Provide MongoDB 4.x plugin.
* Provide Kafka client 2.1+ plugin.
* Provide WebFlux-WebClient plugin.
* Provide ignore-exception plugin.
* Provide quartz scheduler plugin.
* Provide ElasticJob 2.x plugin.
* Provide Spring @Scheduled plugin.
* Provide Spring-Kafka plugin.
* Provide HBase client plugin.
* Provide JSON log format.
* Move Spring WebFlux plugin to the optional plugin.
* Fix inconsistent logic bug in PrefixMatch
* Fix duplicate exit spans in Feign LoadBalancer mechanism.
* Fix the target service blocked by the Kafka reporter.
* Fix configurations of Kafka report don't work.
* Fix rest template concurrent conflict.
* Fix NPE in the ActiveMQ plugin.
* Fix conflict between Kafka reporter and sampling plugin.
* Fix NPE in the log formatter.
* Fix span layer missing in certain cases, in the Kafka plugin.
* Fix error format of time in serviceTraffic update.
* Upgrade bytebuddy to 1.10.14
#### OAP-Backend
* Support Nacos authentication.
* Support labeled meter in the meter receiver.
* Separate UI template into multiple files.
* Provide support for Envoy tracing. Envoy tracer depends on the Envoy community.
* Support query trace by tags.
* Support composite alarm rules.
* Support alarm messages to DingTalk.
* Support alarm messages to WeChat.
* Support alarm messages to Slack.
* Support SSL for Prometheus fetcher and self telemetry.
* Support labeled histogram in the prometheus format.
* Support the status of segment based on entry span or first span only.
* Support the error segment in the sampling mechanism.
* Support SSL certs of gRPC server.
* Support labeled metrics in the alarm rule setting.
* Support to query all labeled data, if no explicit label in the query condition.
* Add TLS parameters in the mesh analysis.
* Add health check for InfluxDB storage.
* Add `super dataset` concept for the traces/logs.
* Add separate replicas configuration for super dataset.
* Add `IN` operator in the OAL.
* Add `!=` operator in the OAL.
* Add `like` operator in the OAL.
* Add `latest` function in the prometheus analysis.
* Add more configurations in the gRPC server.
* Optimize the trace query performance.
* Optimize the CPU usage rate calculation, at least to be 1.
* Optimize the length of slow SQL column in the MySQL storage.
* Optimize the topology query, use client side component name when no server side mapping.
* Add component IDs for Python component.
* Add component ID range for C++.
* Fix Slack notification setting NPE.
* Fix some module missing check of the module manager core.
* Fix authentication doesn't work in sharing server.
* Fix metrics batch persistent size bug.
* Fix trace sampling bug.
* Fix CLR receiver bug.
* Fix end time bug in the query process.
* Fix `Exporter INCREMENT mode` is not working.
* Fix an error when executing startup.bat when the log directory exists
#### UI
* Add browser dashboard.
* Add browser log query page.
* Support query trace by tags.
* Fix JVM configuration.
* Fix CLR configuration.
#### Document
* Add the document about `SW_NO_UPSTREAM_REAL_ADDRESS`.
* Update ALS setup document.
* Add Customization Config section for plugin development.
All issues and pull requests are [here](https://github.com/apache/skywalking/milestone/56?closed=1)