[Metricbeat/kibana/status] Add support for v8format (#40275)

(cherry picked from commit 942f8c7)

CHANGELOG.next.asciidoc

@@ -53,6 +53,7 @@ https://github.com/elastic/beats/compare/v8.8.1\...main[Check the HEAD diff]
 - Setting period for counter cache for Prometheus remote_write at least to 60sec {pull}38553[38553]
 - Add support of Graphite series 1.1.0+ tagging extension for statsd module. {pull}39619[39619]
 - Remove fallback to the node limit for the `kubernetes.pod.cpu.usage.limit.pct` and `kubernetes.pod.memory.usage.limit.pct` metrics calculation
+- Add support for Kibana status metricset in v8 format {pull}40275[40275]
 
 *Osquerybeat*
 

metricbeat/docs/fields.asciidoc

@@ -44450,13 +44450,73 @@ alias to: service.version
 *`kibana.status.status.overall.state`*::
 +
 --
-Kibana overall state.
+Kibana overall state (v7 format).
 
 
 type: keyword
 
 --
 
+*`kibana.status.status.overall.level`*::
++
+--
+Kibana overall level (v8 format).
+
+
+type: keyword
+
+--
+
+*`kibana.status.status.overall.summary`*::
++
+--
+Kibana overall state in a human-readable format.
+
+
+type: text
+
+--
+
+*`kibana.status.status.core.elasticsearch.level`*::
++
+--
+Kibana Elasticsearch client's status
+
+
+type: keyword
+
+--
+
+*`kibana.status.status.core.elasticsearch.summary`*::
++
+--
+Kibana Elasticsearch client's status in a human-readable format.
+
+
+type: text
+
+--
+
+*`kibana.status.status.core.savedObjects.level`*::
++
+--
+Kibana Saved Objects client's status
+
+
+type: keyword
+
+--
+
+*`kibana.status.status.core.savedObjects.summary`*::
++
+--
+Kibana Saved Objects client's status in a human-readable format.
+
+
+type: text
+
+--
+
 [float]
 === metrics
 

metricbeat/module/kibana/status/_meta/fields.yml

@@ -23,7 +23,31 @@
     - name: status.overall.state
       type: keyword
       description: >
-        Kibana overall state.
+        Kibana overall state (v7 format).
+    - name: status.overall.level
+      type: keyword
+      description: >
+        Kibana overall level (v8 format).
+    - name: status.overall.summary
+      type: text
+      description: >
+        Kibana overall state in a human-readable format.
+    - name: status.core.elasticsearch.level
+      type: keyword
+      description: >
+        Kibana Elasticsearch client's status
+    - name: status.core.elasticsearch.summary
+      type: text
+      description: >
+        Kibana Elasticsearch client's status in a human-readable format.
+    - name: status.core.savedObjects.level
+      type: keyword
+      description: >
+        Kibana Saved Objects client's status
+    - name: status.core.savedObjects.summary
+      type: text
+      description: >
+        Kibana Saved Objects client's status in a human-readable format.
     - name: metrics
       type: group
       description: >