Kubernetes state_daemonset metricset for Metricbeat

Implements state_daemonset for the Metricbeat Kubernetes module, in
the model of state_deployment, state_replicaset etc.

Closes: elastic#17010

CHANGELOG.next.asciidoc

@@ -640,6 +640,7 @@ https://github.com/elastic/beats/compare/v7.0.0-alpha2...master[Check the HEAD d
 - Update MySQL dashboard with connection errors and cache metrics {pull}19913[19913] {issue}16955[16955]
 - Add cloud.instance.name into aws ec2 metricset. {pull}20077[20077]
 - Add `scope` setting for elasticsearch module, allowing it to monitor an Elasticsearch cluster behind a load-balancing proxy. {issue}18539[18539] {pull}18547[18547]
+- Add state_daemonset metricset for Kubernetes Metricbeat module {pull}20649[20649]
 
 *Packetbeat*
 

metricbeat/docs/fields.asciidoc

@@ -26312,6 +26312,67 @@ type: double
 --
 Deadline seconds after schedule for considering failed
 
+type: long
+
+--
+
+[float]
+=== daemonset
+
+Kubernetes DaemonSet metrics
+
+
+
+*`kubernetes.daemonset.name`*::
++
+--
+type: keyword
+
+--
+
+[float]
+=== replicas
+
+Kubernetes DaemonSet replica metrics
+
+
+
+*`kubernetes.daemonset.replicas.available`*::
++
+--
+The number of available replicas per DaemonSet
+
+
+type: long
+
+--
+
+*`kubernetes.daemonset.replicas.desired`*::
++
+--
+The desired number of replicas per DaemonSet
+
+
+type: long
+
+--
+
+*`kubernetes.daemonset.replicas.ready`*::
++
+--
+The number of ready replicas per DaemonSet
+
+
+type: long
+
+--
+
+*`kubernetes.daemonset.replicas.unavailable`*::
++
+--
+The number of unavailable replicas per DaemonSet
+
+
 type: long
 
 --

metricbeat/docs/modules/kubernetes.asciidoc

@@ -210,6 +210,7 @@ metricbeat.modules:
  enabled: true
  metricsets:
  - state_node
+ - state_daemonset
  - state_deployment
  - state_replicaset
  - state_statefulset
@@ -303,6 +304,8 @@ The following metricsets are available:
 
 * <<metricbeat-metricset-kubernetes-state_cronjob,state_cronjob>>
 
+* <<metricbeat-metricset-kubernetes-state_daemonset,state_daemonset>>
+
 * <<metricbeat-metricset-kubernetes-state_deployment,state_deployment>>
 
 * <<metricbeat-metricset-kubernetes-state_node,state_node>>
@@ -345,6 +348,8 @@ include::kubernetes/state_container.asciidoc[]
 
 include::kubernetes/state_cronjob.asciidoc[]
 
+include::kubernetes/state_daemonset.asciidoc[]
+
 include::kubernetes/state_deployment.asciidoc[]
 
 include::kubernetes/state_node.asciidoc[]

metricbeat/docs/modules_list.asciidoc

@@ -158,6 +158,7 @@ This file is generated! See scripts/mage/docs_collector.go
 |<<metricbeat-metricset-kubernetes-scheduler,scheduler>> 
 |<<metricbeat-metricset-kubernetes-state_container,state_container>> 
 |<<metricbeat-metricset-kubernetes-state_cronjob,state_cronjob>> 
+|<<metricbeat-metricset-kubernetes-state_daemonset,state_daemonset>> 
 |<<metricbeat-metricset-kubernetes-state_deployment,state_deployment>> 
 |<<metricbeat-metricset-kubernetes-state_node,state_node>> 
 |<<metricbeat-metricset-kubernetes-state_persistentvolumeclaim,state_persistentvolumeclaim>> experimental[] 

metricbeat/metricbeat.reference.yml

@@ -489,6 +489,7 @@ metricbeat.modules:
  enabled: true
  metricsets:
  - state_node
+ - state_daemonset
  - state_deployment
  - state_replicaset
  - state_statefulset

metricbeat/module/kubernetes/_meta/config.reference.yml

@@ -29,6 +29,7 @@
  enabled: true
  metricsets:
  - state_node
+ - state_daemonset
  - state_deployment
  - state_replicaset
  - state_statefulset

metricbeat/module/kubernetes/state_daemonset/_meta/data.json

@@ -0,0 +1,28 @@
+{
+ "@timestamp": "2019-03-01T08:05:34.853Z",
+ "event": {
+ "dataset": "kubernetes.daemonset",
+ "duration": 115000,
+ "module": "kubernetes"
+ },
+ "kubernetes": {
+ "daemonset": {
+ "name": "kube-proxy",
+ "replicas": {
+ "available": 1,
+ "desired": 1,
+ "ready": 1,
+ "unavailable": 0
+ }
+ },
+ "namespace": "kube-system"
+ },
+ "metricset": {
+ "name": "state_daemonset",
+ "period": 10000
+ },
+ "service": {
+ "address": "127.0.0.1:55555",
+ "type": "kubernetes"
+ }
+}

metricbeat/module/kubernetes/state_daemonset/_meta/docs.asciidoc

@@ -0,0 +1 @@
+This is the `state_daemonset` metricset of the Kubernetes module.

metricbeat/module/kubernetes/state_daemonset/_meta/fields.yml

@@ -0,0 +1,29 @@
+- name: daemonset
+ type: group
+ description: >
+ Kubernetes DaemonSet metrics
+ release: experimental
+ fields:
+ - name: name
+ type: keyword
+ - name: replicas
+ type: group
+ description: >
+ Kubernetes DaemonSet replica metrics
+ fields:
+ - name: available
+ type: long
+ description: >
+ The number of available replicas per DaemonSet
+ - name: desired
+ type: long
+ description: >
+ The desired number of replicas per DaemonSet
+ - name: ready
+ type: long
+ description: >
+ The number of ready replicas per DaemonSet
+ - name: unavailable
+ type: long
+ description: >
+ The number of unavailable replicas per DaemonSet

metricbeat/module/kubernetes/state_daemonset/_meta/test/ksm.v1.3.0.expected

@@ -0,0 +1,27 @@
+[
+ {
+ "RootFields": null,
+ "ModuleFields": {
+ "namespace": "kube-system"
+ },
+ "MetricSetFields": {
+ "name": "kube-proxy",
+ "replicas": {
+ "available": 1,
+ "desired": 1,
+ "ready": 1,
+ "unavailable": 0
+ }
+ },
+ "Index": "",
+ "ID": "",
+ "Namespace": "kubernetes.daemonset",
+ "Timestamp": "0001-01-01T00:00:00Z",
+ "Error": null,
+ "Host": "",
+ "Service": "",
+ "Took": 0,
+ "Period": 0,
+ "DisableTimeSeries": false
+ }
+]