update docs, data.json and changelog

CHANGELOG.next.asciidoc

@@ -28,6 +28,7 @@ https://github.com/elastic/beats/compare/v7.0.0-alpha2...master[Check the HEAD d
 
 - Add new option `OpMultiplyBuckets` to scale histogram buckets to avoid decimal points in final events {pull}10994[10994]
 - Change cloud.provider from ec2 to aws and from gce to gcp in add_cloud_metadata to align with ECS. {issue}10775[10775] {pull}11687[11687]
+- system/raid metricset now uses /sys/block instead of /proc/mdstat for data. {pull}11613[11613]
 
 *Packetbeat*
 
@@ -140,6 +141,7 @@ https://github.com/elastic/beats/compare/v7.0.0-alpha2...master[Check the HEAD d
 - Add SSL support for Metricbeat HTTP server. {pull}11482[11482] {issue}11457[11457]
 - The `elasticsearch.index` metricset (with `xpack.enabled: true`) now collects `refresh.external_total_time_in_millis` fields from Elasticsearch. {pull}11616[11616]
 - Allow module configurations to have variants {pull}9118[9118]
+- Added new disk states and raid level to the system/raid metricset. {pull}11613[11613]
 
 *Packetbeat*
 

metricbeat/module/system/raid/_meta/data.json

@@ -21,13 +21,14 @@
                 "active": 2,
                 "failed": 0,
                 "spare": 1,
-                "states": [
-                    "in_sync",
-                    "in_sync",
-                    "spare"
-                ],
-                "total": 3
+                "states": {
+                    "in_sync": 2,
+                    "spare": 1
+                },
+                "total": 3,
+                "unknown": 0
             },
+            "level": "raid1",
             "name": "md0",
             "status": "clean",
             "sync_action": "repair"

metricbeat/module/system/raid/_meta/docs.asciidoc

@@ -3,4 +3,4 @@ This is the raid metricset of the module system. It collects stats about the rai
 This metricset is available on:
 - Linux
 
-The config option `raid.mount_point:` can be used to configure the raid mount point. If running this metricset inside a container, you will need to mount `/sys/block` inside the container.
+The config option `raid.mount_point:` can be used to configure the location of the raid metadata. If running this metricset inside a container, you will need to mount `/sys/block` inside the container using `--system.hostfs`