[metricbeat]update apiserver metrics (#12922)

* Kubernetes apiserver metrics update
* Added etcd and audit metrics among others

CHANGELOG.next.asciidoc

@@ -273,6 +273,7 @@ https://github.com/elastic/beats/compare/v7.0.0-alpha2...master[Check the HEAD d
 - Add Kubernetes controller manager dashboard to Kubernetes module {pull}12744[12744]
 - Allow redis URL format in redis hosts config. {pull}12408[12408]
 - Add tags into ec2 metricset. {issue}[12263]12263 {pull}12372[12372]
+- Add metrics to kubernetes apiserver metricset. {pull}12922[12922]
 - Add kubernetes metricset `scheduler` {pull}12521[12521]
 - Add Kubernetes scheduler dashboard to Kubernetes module {pull}12749[12749]
 - Add `beat` module. {pull}12181[12181] {pull}12615[12615]

metricbeat/docs/fields.asciidoc

@@ -13649,7 +13649,7 @@ Kubernetes API server metrics
 *`kubernetes.apiserver.request.client`*::
 +
 --
-Client doing the requests
+Client executing requests
 
 
 type: keyword
@@ -13689,18 +13689,272 @@ type: keyword
 *`kubernetes.apiserver.request.verb`*::
 +
 --
-Request HTTP verb
+HTTP verb
 
 
 type: keyword
 
 --
 
-*`kubernetes.apiserver.request.count`*::
+*`kubernetes.apiserver.request.code`*::
 +
 --
-Total number of requests
+HTTP code
+
+
+type: keyword
+
+--
+
+*`kubernetes.apiserver.request.content_type`*::
++
+--
+Request HTTP content type
+
+
+type: keyword
+
+--
+
+*`kubernetes.apiserver.request.dry_run`*::
++
+--
+Wether the request uses dry run
+
+
+type: keyword
+
+--
+
+*`kubernetes.apiserver.request.kind`*::
++
+--
+Kind of request
+
+
+type: keyword
+
+--
+
+*`kubernetes.apiserver.request.component`*::
++
+--
+Component handling the request
+
+
+type: keyword
+
+--
+
+*`kubernetes.apiserver.request.group`*::
++
+--
+API group for the resource
+
+
+type: keyword
+
+--
+
+*`kubernetes.apiserver.request.version`*::
++
+--
+version for the group
+
+
+type: keyword
+
+--
+
+*`kubernetes.apiserver.request.handler`*::
++
+--
+Request handler
+
+
+type: keyword
+
+--
+
+*`kubernetes.apiserver.request.method`*::
++
+--
+HTTP method
+
+
+type: keyword
+
+--
+
+*`kubernetes.apiserver.request.host`*::
++
+--
+Request host
+
+
+type: keyword
+
+--
+
+
+*`kubernetes.apiserver.process.cpu.sec`*::
++
+--
+CPU seconds
+
+type: double
+
+--
+
+*`kubernetes.apiserver.process.memory.resident.bytes`*::
++
+--
+Bytes in resident memory
+
+type: long
+
+format: bytes
+
+--
+
+*`kubernetes.apiserver.process.memory.virtual.bytes`*::
++
+--
+Bytes in virtual memory
+
+type: long
+
+format: bytes
+
+--
+
+*`kubernetes.apiserver.process.fds.open.count`*::
++
+--
+Number of open file descriptors
+
+type: long
+
+--
+
+*`kubernetes.apiserver.process.started.sec`*::
++
+--
+Seconds since the process started
+
+type: double
+
+--
+
+
+*`kubernetes.apiserver.http.request.duration.us.percentile.*`*::
++
+--
+Request duration microseconds percentiles
+
+type: object
+
+--
+
+*`kubernetes.apiserver.http.request.duration.us.sum`*::
++
+--
+Request duration microseconds cumulative sum
 
+type: double
+
+--
+
+*`kubernetes.apiserver.http.request.duration.us.count`*::
++
+--
+Request count for duration
+
+type: long
+
+--
+
+*`kubernetes.apiserver.http.request.size.bytes.percentile.*`*::
++
+--
+Request size percentiles
+
+type: object
+
+--
+
+*`kubernetes.apiserver.http.request.size.bytes.sum`*::
++
+--
+Request size cumulative sum
+
+type: long
+
+format: bytes
+
+--
+
+*`kubernetes.apiserver.http.request.size.bytes.count`*::
++
+--
+Request count for size
+
+type: long
+
+--
+
+*`kubernetes.apiserver.http.response.size.bytes.percentile.*`*::
++
+--
+Response size percentiles
+
+type: object
+
+--
+
+*`kubernetes.apiserver.http.response.size.bytes.sum`*::
++
+--
+Response size cumulative sum
+
+type: long
+
+format: bytes
+
+--
+
+*`kubernetes.apiserver.http.response.size.bytes.count`*::
++
+--
+Response count
+
+type: long
+
+--
+
+*`kubernetes.apiserver.http.request.count`*::
++
+--
+Request count for response
+
+type: long
+
+--
+
+*`kubernetes.apiserver.client.request.count`*::
++
+--
+Number of requests as client
+
+type: long
+
+--
+
+
+*`kubernetes.apiserver.request.count`*::
++
+--
+Number of requests
 
 type: long
 
@@ -13711,7 +13965,6 @@ type: long
 --
 Requests latency, sum of latencies in microseconds
 
-
 type: long
 
 --
@@ -13721,7 +13974,6 @@ type: long
 --
 Request latency, number of requests
 
-
 type: long
 
 --
@@ -13731,11 +13983,82 @@ type: long
 --
 Request latency histogram buckets
 
+type: object
+
+--
+
+*`kubernetes.apiserver.request.duration.us.sum`*::
++
+--
+Request duration, sum in microseconds
+
+type: long
+
+--
+
+*`kubernetes.apiserver.request.duration.us.count`*::
++
+--
+Request duration, number of operations
+
+type: long
+
+--
+
+*`kubernetes.apiserver.request.duration.us.bucket.*`*::
++
+--
+Request duration, histogram buckets
 
 type: object
 
 --
 
+*`kubernetes.apiserver.request.current.count`*::
++
+--
+Inflight requests
+
+type: long
+
+--
+
+*`kubernetes.apiserver.request.longrunning.count`*::
++
+--
+Number of requests active long running requests
+
+type: long
+
+--
+
+*`kubernetes.apiserver.etcd.object.count`*::
++
+--
+Number of kubernetes objects at etcd
+
+type: long
+
+--
+
+*`kubernetes.apiserver.audit.event.count`*::
++
+--
+Number of audit events
+
+type: long
+
+--
+
+*`kubernetes.apiserver.audit.rejected.count`*::
++
+--
+Number of audit rejected events
+
+type: long
+
+--
+
 [float]
 === container