Preparing release 1.21.0 (jaegertracing#2630)

* updated changelog

Signed-off-by: Joe Elliott <[email protected]>

* Added ui changelog

Signed-off-by: Joe Elliott <[email protected]>

* Fixed UI changelog to point to 1.12.0

Signed-off-by: Joe Elliott <[email protected]>

* Updated jaeger-ui to v1.12.0

Signed-off-by: Joe Elliott <[email protected]>

* Resolving concerns

Signed-off-by: Joe Elliott <[email protected]>

Author: joe-elliott

CHANGELOG.md

@@ -1,9 +1,50 @@
 Changes by Version
 ==================
 
-1.21.0 (unreleased)
+1.22.0 (unreleased)
 -------------------
 
+1.21.0 (2020-11-13)
+-------------------
+
+### Backend Changes
+
+#### New Features
+
+* Add trace anonymizer utility ([#2621](https://github.com/jaegertracing/jaeger/pull/2621), [#2585](https://github.com/jaegertracing/jaeger/pull/2585), [@Ashmita152](https://github.com/Ashmita152))
+* Add URL option for sampling strategies file ([#2519](https://github.com/jaegertracing/jaeger/pull/2519), [@goku321](https://github.com/goku321))
+* Expose tunning options via expvar ([#2496](https://github.com/jaegertracing/jaeger/pull/2496), [@dstdfx](https://github.com/dstdfx))
+* Support more encodings for Kafka in OTel Ingester ([#2580](https://github.com/jaegertracing/jaeger/pull/2580), [@XSAM](https://github.com/XSAM))
+* Create debug docker images for jaeger backends ([#2545](https://github.com/jaegertracing/jaeger/pull/2545), [@Ashmita152](https://github.com/Ashmita152))
+* Display backend & UI versions in Jaeger UI
+  * Inject version info into index.html ([#2547](https://github.com/jaegertracing/jaeger/pull/2547), [@yurishkuro](https://github.com/yurishkuro))
+  * Added jaeger ui version to about menu ([#606](https://github.com/jaegertracing/jaeger-ui/pull/606), [@alanisaac](https://github.com/alanisaac))
+
+#### Bug fixes, Minor Improvements
+
+* Update x/text to v0.3.4 ([#2625](https://github.com/jaegertracing/jaeger/pull/2625), [@objectiser](https://github.com/objectiser))
+* Update CodeQL to latest best practices ([#2615](https://github.com/jaegertracing/jaeger/pull/2615), [@jhutchings1](https://github.com/jhutchings1))
+* Bump opentelemetry-collector to v0.14.0 ([#2617](https://github.com/jaegertracing/jaeger/pull/2617), [@Vemmy124](https://github.com/Vemmy124))
+* Bump Badger to v1.6.2 ([#2613](https://github.com/jaegertracing/jaeger/pull/2613), [@Ackar](https://github.com/Ackar))
+* Fix sarama consumer deadlock ([#2587](https://github.com/jaegertracing/jaeger/pull/2587), [@albertteoh](https://github.com/albertteoh))
+* Avoid deadlock if Stop is called before Serve ([#2608](https://github.com/jaegertracing/jaeger/pull/2608), [@chlunde](https://github.com/chlunde))
+* Return buffers to pool on network errors or queue overflow ([#2609](https://github.com/jaegertracing/jaeger/pull/2609), [@chlunde](https://github.com/chlunde))
+* Clarify deadlock panic message ([#2605](https://github.com/jaegertracing/jaeger/pull/2605), [@yurishkuro](https://github.com/yurishkuro))
+* fix: don't create tags w/ empty name for internal zipkin spans ([#2596](https://github.com/jaegertracing/jaeger/pull/2596), [@mzahor](https://github.com/mzahor))
+* TBufferedServer: Avoid channel close/send race on Stop ([#2583](https://github.com/jaegertracing/jaeger/pull/2583), [@chlunde](https://github.com/chlunde))
+* Bumped OpenTelemetry Collector to v0.12.0 ([#2562](https://github.com/jaegertracing/jaeger/pull/2562), [@jpkrohling](https://github.com/jpkrohling))
+* Disable Zipkin server if port/address is not configured ([#2554](https://github.com/jaegertracing/jaeger/pull/2554), [@yurishkuro](https://github.com/yurishkuro))
+* [hotrod] Add links to traces ([#2536](https://github.com/jaegertracing/jaeger/pull/2536), [@yurishkuro](https://github.com/yurishkuro))
+* OTel Cassandra/Elasticsearch Exporter queue defaults ([#2533](https://github.com/jaegertracing/jaeger/pull/2533), [@joe-elliott](https://github.com/joe-elliott))
+* [otel] Update jaeger-lib to v2.4.0 ([#2538](https://github.com/jaegertracing/jaeger/pull/2538), [@dstdfx](https://github.com/dstdfx))
+* Remove unnecessary ServiceName index seek if tags query is available ([#2535](https://github.com/jaegertracing/jaeger/pull/2535), [@burmanm](https://github.com/burmanm))
+* Update static UI assets path in contrib doc ([#2548](https://github.com/jaegertracing/jaeger/pull/2548), [@albertteoh](https://github.com/albertteoh))
+
+### UI Changes
+
+* UI pinned to version 1.12.0. The changelog is available here [v1.12.0](https://github.com/jaegertracing/jaeger-ui/blob/master/CHANGELOG.md#v1120-november-14-2020)
+
+
 1.20.0 (2020-09-29)
 -------------------