Changes by Version
==================
Release Notes.

8.9.0
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#### OAP Server

* Add component definition for `Jackson`.
* Fix that zipkin-receiver plugin is not packaged into dist.
* Replace e2e cases to e2e-v2: Lua Nginx/SelfObservability.
* Upgrade Armeria to 1.12, upgrade OpenSearch test version to 1.1.0.
* Add component definition for `Apache-Kylin`.
* Enhance `get` generation mechanism of OAL engine, support map type of source's field.
* Replace e2e cases to e2e-v2: Gateway.
* Add `tag`(Map) into All, Service, ServiceInstance and Endpoint sources.
* Fix `funcParamExpression` and `literalExpression` can't be used in the same aggregation function.
* Support cast statement in the OAL core engine.
* Support `(str->long)` and `(long)` for string to long cast statement.
* Support `(str->int)` and `(int)` for string to int cast statement.
* Support Long literal number in the OAL core engine.
* Support literal `string` as parameter of aggregation function.
* Add `attributeExpression` and `attributeExpressionSegment` in the OAL grammar tree to support `map` type for the
  attribute expression.

#### UI

* Optimize endpoint dependency.
* Show service name by hovering nodes in the sankey chart.
* Add Apache Kylin logo.
* Add ClickHouse logo.

#### Documentation

All issues and pull requests are [here](https://github.com/apache/skywalking/milestone/101?closed=1)

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Find change logs of all versions [here](changes).