Update changelog and configs for performance presets (#3879)

* Add changelog and update default/reference configs for performance presets

* update config templates

_meta/config/common.p2.yml.tmpl

@@ -8,6 +8,7 @@ outputs:
     api_key: "example-key"
     #username: "elastic"
     #password: "changeme"
+    preset: balanced
 
 
 

_meta/config/common.reference.p2.yml.tmpl

@@ -9,6 +9,11 @@ outputs:
     # username: "elastic"
     # password: "changeme"
 
+    # Performance preset for elasticsearch outputs. One of "balanced", "throughput",
+    # "scale", "latency" and "custom".
+    # The default if unspecified is "custom".
+    preset: balanced
+
 inputs:
   - type: system/metrics
     # Each input must have a unique ID.

_meta/config/elastic-agent.docker.yml.tmpl

@@ -7,6 +7,7 @@ outputs:
     hosts: '${ELASTICSEARCH_HOSTS:http://elasticsearch:9200}'
     username: '${ELASTICSEARCH_USERNAME:elastic}'
     password: '${ELASTICSEARCH_PASSWORD:changeme}'
+    preset: balanced
 
 inputs:
   - type: system/metrics

changelog/fragments/1701882851-performance-presets.yaml

@@ -0,0 +1,8 @@
+kind: feature
+summary: Add performance presets to the Elasticsearch output configuration.
+
+description: Add a "preset" field to Elasticsearch output configurations that applies a set of configuration overrides based on a desired performance priority. Valid values are "balanced", "throughput", "scale", "latency" and "custom". The default if unspecified is "custom".
+
+component: all
+pr: https://github.com/elastic/beats/pull/37259
+issue: https://github.com/elastic/elastic-agent/issues/3797

elastic-agent.docker.yml

@@ -7,6 +7,7 @@ outputs:
     hosts: '${ELASTICSEARCH_HOSTS:http://elasticsearch:9200}'
     username: '${ELASTICSEARCH_USERNAME:elastic}'
     password: '${ELASTICSEARCH_PASSWORD:changeme}'
+    preset: balanced
 
 inputs:
   - type: system/metrics

elastic-agent.reference.yml

@@ -15,6 +15,11 @@ outputs:
     # username: "elastic"
     # password: "changeme"
 
+    # Performance preset for elasticsearch outputs. One of "balanced", "throughput",
+    # "scale", "latency" and "custom".
+    # The default if unspecified is "custom".
+    preset: balanced
+
 inputs:
   - type: system/metrics
     # Each input must have a unique ID.

elastic-agent.yml

@@ -14,6 +14,7 @@ outputs:
     api_key: "example-key"
     #username: "elastic"
     #password: "changeme"
+    preset: balanced