Merge pull request #1067 from bosch-io/doc/release201

added Ditto 2.0.1 release notes

Author: thjaeckle

documentation/src/main/resources/_data/sidebars/ditto_sidebar.yml

@@ -23,6 +23,9 @@ entries:
       - title: Release Notes
         output: web
         folderitems:
+          - title: 2.0.1
+            url: /release_notes_201.html
+            output: web
           - title: 2.0.0
             url: /release_notes_200.html
             output: web

documentation/src/main/resources/pages/ditto/release_notes_200.md

@@ -201,9 +201,7 @@ packages were renamed:
 New Java client instances are instantiated differently, please have a look at the  
 [migration notes](#ditto-java-client-instantiation).
 
-In addition, all APIs which returned a `CompletableFuture` were adjusted to return a `CompletionStage` instead, 
-please have a look at the  
-[migration notes](#ditto-java-client-completionstage-apis).
+In addition, all APIs which returned a `CompletableFuture` were adjusted to return a `CompletionStage` instead.
 
 #### Ditto JavaScript client
 

documentation/src/main/resources/pages/ditto/release_notes_201.md

@@ -0,0 +1,43 @@
+---
+title: Release notes 2.0.1
+tags: [release_notes]
+published: true
+keywords: release notes, announcements, changelog
+summary: "Version 2.0.1 of Eclipse Ditto, released on 20.05.2021"
+permalink: release_notes_201.html
+---
+
+This is a bugfix release, no new features since [2.0.0](release_notes_200.html) were added.
+
+## Changelog
+
+Compared to the latest release [2.0.0](release_notes_200.html), the following bugfixes were added.
+
+### Bugfixes
+
+This is a complete list of the
+[merged pull requests](https://github.com/eclipse/ditto/pulls?q=is%3Apr+milestone%3A2.0.1), including the fixed bugs.
+
+#### [Fixed that error responses in WS contained wrong topic path](https://github.com/eclipse/ditto/pull/1057)
+
+The Ditto WebSocket returned a wrong `topic` for DittoProtocol messages for error responses.
+
+#### [Optimized MQTT protocol level acknowledgements](https://github.com/eclipse/ditto/pull/1064)
+
+When using MQTT option `"reconnectForRedelivery"`, the downtime during the reconnect was optimized to be very small
+in order to lose only few "QoS 0" messages.
+
+#### [Made AckUpdater work with ddata sharding](https://github.com/eclipse/ditto/pull/1063)
+
+"Weak" Acknowledgements were broken in 2.0.0 when Ditto was operated in a cluster with more than 1 instances.
+
+#### [Fixed write-concern for commands requesting "search-persisted" ACK](https://github.com/eclipse/ditto/pull/1059)
+
+The Ditto search was updated with a wrong write concern which caused higher search update times.  
+In addition, requests with "search-persisted" acknowledgement used the wrong write concern as well which could have
+caused search inconsistencies. 
+
+#### [Fixed that logging was not configurable](https://github.com/eclipse/ditto/pull/1066)
+
+Previously, there were no options to configure logging for Ditto - this was fixed and it is possible to
+either configure a "logstash" endpoint or files based log appending.