Collect normalized CPU percentages by default

CHANGELOG.next.asciidoc

@@ -92,6 +92,7 @@ TLS or Beats that accept connections over TLS and validate client certificates.
 - Release elb module as GA. {pull}15485[15485]
 - Add a `system/network_summary` metricset {pull}15196[15196]
 - Add mesh metricset for Istio Metricbeat module{pull}15535[15535]
+- Make the `system/cpu` metricset collect normalized CPU metrics by default. {issue}15618[15618] {pull}15729[15729]
 
 *Packetbeat*
 

metricbeat/docs/modules/system.asciidoc

@@ -178,7 +178,7 @@ metricbeat.modules:
   processes: ['.*']
 
   # Configure the metric types that are included by these metricsets.
-  cpu.metrics:  ["percentages"]  # The other available options are normalized_percentages and ticks.
+  cpu.metrics:  ["percentages","normalized_percentages"]  # The other available option is ticks.
   core.metrics: ["percentages"]  # The other available option is ticks.
 
   # A list of filesystem types to ignore. The filesystem metricset will not

metricbeat/metricbeat.reference.yml

@@ -79,7 +79,7 @@ metricbeat.modules:
   processes: ['.*']
 
   # Configure the metric types that are included by these metricsets.
-  cpu.metrics:  ["percentages"]  # The other available options are normalized_percentages and ticks.
+  cpu.metrics:  ["percentages","normalized_percentages"]  # The other available option is ticks.
   core.metrics: ["percentages"]  # The other available option is ticks.
 
   # A list of filesystem types to ignore. The filesystem metricset will not

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

@@ -20,7 +20,7 @@
   processes: ['.*']
 
   # Configure the metric types that are included by these metricsets.
-  cpu.metrics:  ["percentages"]  # The other available options are normalized_percentages and ticks.
+  cpu.metrics:  ["percentages","normalized_percentages"]  # The other available option is ticks.
   core.metrics: ["percentages"]  # The other available option is ticks.
 
   # A list of filesystem types to ignore. The filesystem metricset will not

metricbeat/module/system/cpu/config.go

@@ -62,5 +62,5 @@ func (c Config) Validate() error {
 }
 
 var defaultConfig = Config{
-	Metrics: []string{percentages},
+	Metrics: []string{percentages, normalizedPercentages},
 }

x-pack/metricbeat/metricbeat.reference.yml

@@ -79,7 +79,7 @@ metricbeat.modules:
   processes: ['.*']
 
   # Configure the metric types that are included by these metricsets.
-  cpu.metrics:  ["percentages"]  # The other available options are normalized_percentages and ticks.
+  cpu.metrics:  ["percentages","normalized_percentages"]  # The other available option is ticks.
   core.metrics: ["percentages"]  # The other available option is ticks.
 
   # A list of filesystem types to ignore. The filesystem metricset will not