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http://skywalking.apache.org/downloads/

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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.