CHANGES.md

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

8.9.0
------------------

#### Project

* E2E tests immigrate to e2e-v2.
* Support JDK 16 and 17.

#### OAP Server

* Add component definition for `Jackson`.
* Fix that zipkin-receiver plugin is not packaged into dist.
* 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.
* 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.
* Refactor the OAL compiler context to improve readability.
* Fix wrong generated codes of `hashCode` and `remoteHashCode` methods for numeric fields.
* Support `!= null` in OAL engine.
* Add `Message Queue Consuming Count` metric for MQ consuming service and endpoint.
* Add `Message Queue Avg Consuming Latency` metric for MQ consuming service and endpoint.
* Support `-Inf` as bucket in the meter system.
* Fix setting wrong field when combining `Event`s.
* Support search browser service.
* Add `getProfileTaskLogs` to profile query protocol.
* Set `SW_KAFKA_FETCHER_ENABLE_NATIVE_PROTO_LOG`, `SW_KAFKA_FETCHER_ENABLE_NATIVE_JSON_LOG` default `true`.
* Fix unexpected deleting due to TTL mechanism bug for H2, MySQL, TiDB and PostgreSQL.
* Add a GraphQL query to get OAP version, display OAP version in startup message and error logs.
* Fix TimeBucket missing in H2, MySQL, TiDB and PostgreSQL bug, which causes TTL doesn't work for `service_traffic`.
* Fix TimeBucket missing in ElasticSearch and provide compatible `storage2Entity` for previous versions.
* Fix ElasticSearch implementation of `queryMetricsValues` and `readLabeledMetricsValues` doesn't fill default values
  when no available data in the ElasticSearch server.
* Fix config yaml data type conversion bug when meets special character like !.
* Optimize metrics of minute dimensionality persistence. The value of metrics, which has declaration of the default
  value and current value equals the default value logically, the whole row wouldn't be pushed into database.
* Fix `max` function in OAL doesn't support negative long.

#### UI

* Optimize endpoint dependency.
* Show service name by hovering nodes in the sankey chart.
* Add Apache Kylin logo.
* Add ClickHouse logo.
* Optimize the style and add tips for log conditions.
* Fix the condition for trace table.
* Optimize profile functions.
* Implement a reminder to clear cache for dashboard templates.
* Support +/- hh:mm in TimeZone setting.
* Optimize global settings.
* Fix current endpoint for endpoint dependency.
* Add version in the global settings popup.

#### Documentation

* Enhance documents about the data report and query protocols.
* Restructure documents about receivers and fetchers.
    1. Remove general receiver and fetcher docs
    2. Add more specific menu with docs to help users to find documents easier.

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).