[stable/logstash] deprecating chart (#24353)

Signed-off-by: Matt Farina <matt@mattfarina.com>

stable/logstash/Chart.yaml

@@ -1,17 +1,11 @@
 apiVersion: v1
-description: Logstash is an open source, server-side data processing pipeline
+description: DEPRECATED - Logstash is an open source, server-side data processing pipeline
 icon: https://www.elastic.co/assets/blt86e4472872eed314/logo-elastic-logstash-lt.svg
 home: https://www.elastic.co/products/logstash
 name: logstash
-version: 2.4.2
+version: 2.4.3
 appVersion: 7.1.1
 sources:
 - https://www.docker.elastic.co
 - https://www.elastic.co/guide/en/logstash/current/index.html
-maintainers:
-- name: rendhalver
-  email: pete.brown@powerhrg.com
-- name: jar361
-  email: jrodgers@powerhrg.com
-- name: christian-roggia
-  email: christian.roggia@gmail.com
+deprecated: true

stable/logstash/OWNERS

@@ -1,6 +0,0 @@
-approvers:
-- christian-roggia
-- rendhalver
-reviewers:
-- christian-roggia
-- rendhalver

stable/logstash/README.md

@@ -7,6 +7,10 @@ For more information, see the Helm Charts [Deprecation and Archive Notice](https
 
 [Logstash](https://www.elastic.co/products/logstash) is an open source, server-side data processing pipeline that ingests data from a multitude of sources simultaneously, transforms it, and then sends it to your favorite “stash.”
 
+## DEPRECATION NOTICE
+
+This chart is deprecated and no longer supported.
+
 ## TL;DR;
 
 ```console