Update changelog

(cherry picked from commit 18ef80c)

CHANGELOG.md

@@ -2,6 +2,72 @@
 
 # Change Log
 
+## v1.21.0-rc0 [2021-12-01]
+
+### Release Notes
+
+Thank you to @zak-pawel for lots of linter fixes!
+
+### Bugfixes
+
+  - [#10112](https://github.com/influxdata/telegraf/pull/10112) `inputs.cloudwatch` fix cloudwatch metrics collection
+  - [#10178](https://github.com/influxdata/telegraf/pull/10178) `outputs.all` fix register bigquery to output plugins
+  - [#10165](https://github.com/influxdata/telegraf/pull/10165) `inputs.sysstat` fix sysstat to use unique temp file vs hard-coded
+  - [#10046](https://github.com/influxdata/telegraf/pull/10046) fix update nats-sever to support openbsd
+  - [#10091](https://github.com/influxdata/telegraf/pull/10091) `inputs.prometheus` fix check error before defer in prometheus k8s
+  - [#10101](https://github.com/influxdata/telegraf/pull/10101) `inputs.win_perf_counters` fix add setting to win_perf_counters input to ignore localization
+  - [#10136](https://github.com/influxdata/telegraf/pull/10136) `inputs.snmp_trap` fix remove snmptranslate from readme and fix default path
+  - [#10116](https://github.com/influxdata/telegraf/pull/10116) `inputs.statsd` fix input plugin statsd parse error
+  - [#10131](https://github.com/influxdata/telegraf/pull/10131) fix skip knxlistener when writing the sample config
+  - [#10119](https://github.com/influxdata/telegraf/pull/10119) `inputs.cpu` update shirou/gopsutil to v3
+  - [#10074](https://github.com/influxdata/telegraf/pull/10074) `outputs.graylog` fix failing test due to port already in use
+  - [#9865](https://github.com/influxdata/telegraf/pull/9865) `inputs.directory_monitor` fix directory monitor input plugin when data format is CSV and csv_skip_rows>0 and csv_header_row_count>=1
+  - [#9862](https://github.com/influxdata/telegraf/pull/9862) `outputs.graylog` fix graylog plugin TLS support and message format
+  - [#9908](https://github.com/influxdata/telegraf/pull/9908) `parsers.json_v2` fix remove dead code
+  - [#9881](https://github.com/influxdata/telegraf/pull/9881) `outputs.graylog` fix mute graylog UDP/TCP tests by marking them as integration
+  - [#9751](https://github.com/influxdata/telegraf/pull/9751)  bump google.golang.org/grpc from 1.39.1 to 1.40.0
+
+### Features
+
+  - [#10200](https://github.com/influxdata/telegraf/pull/10200) `aggregators.deprecations.go` Implement deprecation infrastructure
+  - [#9518](https://github.com/influxdata/telegraf/pull/9518) `inputs.snmp` snmp to use gosmi
+  - [#10130](https://github.com/influxdata/telegraf/pull/10130) `outputs.influxdb_v2` add retry to 413 errors with InfluxDB output
+  - [#10144](https://github.com/influxdata/telegraf/pull/10144) `inputs.win_services` add exclude filter
+  - [#9995](https://github.com/influxdata/telegraf/pull/9995) `inputs.mqtt_consumer` enable extracting tag values from MQTT topics
+  - [#9419](https://github.com/influxdata/telegraf/pull/9419) `aggregators.all` add support of aggregator as Starlark script
+  - [#9561](https://github.com/influxdata/telegraf/pull/9561) `processors.regex` extend regexp processor do allow renaming of measurements, tags and fields
+  - [#8184](https://github.com/influxdata/telegraf/pull/8184) `outputs.http` add use_batch_format for HTTP output plugin
+  - [#9988](https://github.com/influxdata/telegraf/pull/9988) `inputs.kafka_consumer` add max_processing_time config to Kafka Consumer input
+  - [#9841](https://github.com/influxdata/telegraf/pull/9841) `inputs.sqlserver` add additional metrics to support elastic pool (sqlserver plugin)
+  - [#9910](https://github.com/influxdata/telegraf/pull/9910) `common.tls` filter client certificates by DNS names
+  - [#9942](https://github.com/influxdata/telegraf/pull/9942) `outputs.azure_data_explorer` add option to skip table creation in azure data explorer output
+  - [#9984](https://github.com/influxdata/telegraf/pull/9984) `processors.ifname` add more details to logmessages
+  - [#9833](https://github.com/influxdata/telegraf/pull/9833) `common.kafka` add metadata full to config
+  - [#9876](https://github.com/influxdata/telegraf/pull/9876) update etc/telegraf.conf and etc/telegraf_windows.conf
+  - [#9256](https://github.com/influxdata/telegraf/pull/9256) `inputs.modbus` modbus connection settings (serial)
+  - [#9860](https://github.com/influxdata/telegraf/pull/9860) `inputs.directory_monitor` adds the ability to create and name a tag containing the filename using the directory monitor input plugin
+  - [#9740](https://github.com/influxdata/telegraf/pull/9740) `inputs.prometheus` add ignore_timestamp option
+  - [#9513](https://github.com/influxdata/telegraf/pull/9513) `processors.starlark` starlark processor example for processing sparkplug_b messages
+  - [#9449](https://github.com/influxdata/telegraf/pull/9449) `parsers.json_v2` support defining field/tag tables within an object table
+  - [#9827](https://github.com/influxdata/telegraf/pull/9827) `inputs.elasticsearch_query` add debug query output to elasticsearch_query
+  - [#9241](https://github.com/influxdata/telegraf/pull/9241) `inputs.snmp` telegraf to merge tables with different indexes
+  - [#9013](https://github.com/influxdata/telegraf/pull/9013) `inputs.opcua` allow user to select the source for the metric timestamp.
+  - [#9706](https://github.com/influxdata/telegraf/pull/9706) `inputs.puppetagent` add measurements from puppet 5
+  - [#9644](https://github.com/influxdata/telegraf/pull/9644) `outputs.graylog` add graylog plugin TCP support
+  - [#8229](https://github.com/influxdata/telegraf/pull/8229) `outputs.azure_data_explorer` add json_timestamp_layout option
+
+### New Input Plugins
+
+  - [#9724](https://github.com/influxdata/telegraf/pull/9724) `inputs.all` feat: add intel_pmu plugin
+  - [#9771](https://github.com/influxdata/telegraf/pull/9771) `inputs.all` feat: add Linux Volume Manager input plugin
+  - [#9236](https://github.com/influxdata/telegraf/pull/9236) `inputs.all` feat: Openstack input plugin
+
+### New Output Plugins
+
+  - [#9891](https://github.com/influxdata/telegraf/pull/9891) `outputs.all` feat: add new groundwork output plugin
+  - [#9923](https://github.com/influxdata/telegraf/pull/9923) `common.tls` feat: add mongodb output plugin 
+  - [#9346](https://github.com/influxdata/telegraf/pull/9346) `outputs.all` feat: Azure Event Hubs output plugin
+
 ## v1.20.4 [2021-11-17]
 
 ### Release Notes