Revert "Kapacitor release notes update - v1.6.3 (#3702)"

This reverts commit c90e6a8.

content/kapacitor/v1.6/about_the_project/releasenotes-changelog.md

@@ -7,25 +7,6 @@ menu:
     name: Release notes
 ---
 
-## v1.6.3 [2022-01-20]
-
-### Features
-
-- Add support for custom `attributes` field in [Alerta event handler](/kapacitor/v1.6/event_handlers/alerta/). 
-- Add `host` and `attribute` options to [BigPanda event handler](/kapacitor/v1.6/event_handlers/bigpanda/). 
-  - `host`: Corresponds to host alert payload parameter; identifies the main object that caused the alert.
-  - `attribute`: Option to add additional attribute(s) to the alert payload.
-- Add new `auto-attributes` configuration option to BigPanda node.
--  Ability to add new headers to HTTP posts directly in `env var` config. 
-- `Topic queue length` is now configurable. This allows you to set a `topic-buffer-length` parameter in the Kapacitor config file in the
-[alert](https://docs.influxdata.com/kapacitor/v1.6/administration/configuration/#alert) section. The default is 5000.  Minimum length
-is 1000.
-- Add new `address template` to email alert. Email addresses no longer need to be hardcoded; can be derived directly from data.
-
-### Bug fixes
-- Deprecation in response to [sweet32](https://sweet32.info/): stopped using block ciphers.
-- Add additional detail to the error message `missing flux data`. This error is generated when issues occur when running a **Flux** query within a Batch TICKscript.
-
 ## v1.6.2 [2021-09-24]
 
 ### Features