Sourced from applicationinsights-logging-log4j2's releases.

Application Insights Java SDK 2.4.0

This introduces Application Insights Java SDK 2.4.0. This adds all the functionality introduced in 2.4.0-BETA and some additional bug fixes and enhancements.

Important Note: Spring Boot Starter Version

Previously, the Spring Boot Starter had an independent version number, causing some confusion. Future versions the Spring Boot Starter version will track with the SDK version. There will not be a Spring Boot Starter version 1.2.0, and in it's place version 2.4.0.

Changes introduced in 2.4.0-BETA

The changes to WebTelemetryModule in 2.4.0-BETA were reverted back the state in 2.3.1.

Enhancements

1. Added retries to CDSProfileFetcher #901
2. Added caching of sdk version id, reducing number of file IO operations #896

Bug Fixes

1. Fix #907 - Ensures string compare is case insensitive when running a SQL explain on a select statement.
2. Fixed ThreadLocal leak #887
3. Fixed QuickPulse schema version #904
4. Fix #919 - Fixed issue when adding duplicate Windows performance counter.
5. Misc stability improvements #932, #941, #945, #946, #947, #948

Application Insights Java SDK 2.4.0-BETA

Welcome to Application Insights Java SDK 2.4.0-BETA and SpringBoot Starter 1.2.0-BETA. This version introduces several enhancement and bug fixes.

Removed and Deprecated

1. Removed support for multiple apps instrumented with single JVM Agent. Instrumentation will only work for single apps in application server.
2. Deprecated class ApplicationInsightsHttpResponseWrapper.java

Breaking change

1. WebRequestTelemetry interface now has another method setRequestTelemetryContext. This is needed to propagate context explicitly in asynchronous environments. This change is likely to break clients relying on implementation of this interface in their code.

Enhancements

1. Introduced beta support for manual context propagation in Async and Explicit Multithreading scenarios.
   Please refer to this wiki (https://github.com/Microsoft/ApplicationInsights-Java/wiki/Distributed-Tracing-in-Asynchronous-Java-Applications) for instructions.
2. #444 Introduced support to capture asynchronous request.
3. #749 Introduce beta supported instrumentation for Postgres SQL jdbc4 driver prepared statements via JVM Agent.
4. Introduced experimental API's AIHttpServletListener, HttpServerHandler, ApplicationInsightsServletExtractor and HttpExtractor.
5. Introduced WebTelemetryModule.setRequestTelemetryContext API.
6. #797 SDKLogger can now be enabled using system properties.

Bug Fixes

1. #879 Fixed issue with request/dependency correlation
2. Fixed #826 Remove duplicate Postgres provider.
3. #881 Fix SDK version in QuickPulse Telemetry.
4. #883 Fixed dependency metric collection for QuickPulse/LiveMetrics
5. #852 Fixed bug in PreparedStatementVisitor to instrument all overloads of setTimestamp.
6. Various stability improvements: #850 #849 #842 #847 #843 #887 #888

... (truncated)

Sourced from applicationinsights-logging-log4j2's changelog.

Version 2.4.0

• Updated Spring Boot Starter version number to track with the SDK version.
• Upgrade gradle to 5.3.1
• Fix #907 - ensure string compare is case insensitive when running a SQL explain on a select statement.
• Fixed ThreadLocal leak #887
• Fixed QuickPulse schema version #904
• Added retries to CDSProfileFetcher #901
• Fix #919 - Fixed issue when adding duplicate Windows performance counter.
• Added caching of sdk version id, reducing number of file IO operations #896
• Fixed bug with live metrics (QuickPulse) where request/dependency durations were being truncated to the millisecond.
• Misc stability improvements
  #932
  #941
  #945
  #946
  #947
  #948

Version 2.4.0-BETA

• Removed support for multiple apps instrumented with single JVM Agent. Instrumentation will only work for single apps
  in application server.
• Fixed #749 introduce support for PostgreSQL jdbc4 prepared statements.
• Introduced support for Manual Async and Explicit Multithreading correlation.
• Introduced setRequestTelemetryContext API in WebTelemetryModule Interface.
• Introduced experimental API's AIHttpServletListner, HttpServerHandler, ApplicationInsightsServletExtractor
  and HttpExtractor.
• Deprecated ApplicationInsightsHttpResponseWrapper
• Fixed #826 Remove duplicate provider.
• Fix incorrect sdk version being sent in Quick Pulse payload.
• Fix #882 Dependency metrics does not show up on
  Livemetrics UX.

• 8abe83e Merge pull request #968 from microsoft/fix_poms
• 218164e remove test dependencies from pom. ensure provided dependencies are included.
• 82532e3 Merge pull request #967 from microsoft/fix_poms
• 19a4c44 fix compile dependencies in log4j2 appender pom
• 209beb1 fix provided dependencies in web module pom
• 908e63e remove invalid @​return javadoc
• 70a2d09 add poms for collectd and agent
• 1924fc0 remove dependencies from web/core poms
• f7e307e Merge pull request #966 from microsoft/fix_task_dependencies
• b2997b8 fix jar task dependencies
• Additional commits viewable in compare view

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