[stable/metricbeat] deprecating chart (#24359)

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

stable/metricbeat/Chart.yaml

@@ -1,14 +1,10 @@
 apiVersion: v1
-description: A Helm chart to collect Kubernetes logs with metricbeat
+description: DEPRECATED - A Helm chart to collect Kubernetes logs with metricbeat
 icon: https://www.elastic.co/assets/blt47799dcdcf08438d/logo-elastic-beats-lt.svg
 name: metricbeat
-version: 1.7.2
+version: 1.7.3
 appVersion: 6.7.0
 home: https://www.elastic.co/products/beats/metricbeat
 sources:
 - https://www.elastic.co/guide/en/beats/metricbeat/current/index.html
-maintainers:
-- name: at-k
-  email: atushi.k@gmail.com
-- name: mumoshu
-  email: ykuoka@gmail.com
+deprecated: true

stable/metricbeat/OWNERS

@@ -1,6 +0,0 @@
-approvers:
-- at-k
-- mumoshu
-reviewers:
-- at-k
-- mumoshu

stable/metricbeat/README.md

@@ -7,6 +7,10 @@ For more information, see the Helm Charts [Deprecation and Archive Notice](https
 
 [metricbeat](https://www.elastic.co/guide/en/beats/metricbeat/current/index.html) is used to ship Kubernetes and host metrics to multiple outputs.
 
+## DEPRECATION NOTICE
+
+This chart is deprecated and no longer supported.
+
 ## Prerequisites
 
 -   Kubernetes 1.9+