Add elasticsearch_expoter example

Also renamed elasticsearch `uri` config key to `address`.

cmd/agent/agent-integrations-config.yaml

@@ -40,6 +40,9 @@ integrations:
     enabled: true
   consul_exporter:
     enabled: true
+  elasticsearch_exporter:
+    enabled: true
+    address: http://localhost:9200
   prometheus_remote_write:
     - url: http://localhost:9009/api/prom/push
 

docs/configuration-reference.md

@@ -2918,7 +2918,7 @@ Full reference of options:
   #
   
   # HTTP API address of an Elasticsearch node.
-  [ api : <string> | default = "http://localhost:9200" ]
+  [ address : <string> | default = "http://localhost:9200" ]
   
   # Timeout for trying to get stats from Elasticsearch.
   [ timeout: <duration> | default = "5s" ]

example/docker-compose/docker-compose.integrations.yaml

@@ -95,3 +95,18 @@ services:
     image: consul
     ports:
       - "8500:8500"
+
+  elasticsearch:
+    image: docker.elastic.co/elasticsearch/elasticsearch:7.10.1
+    environment:
+      - node.name=elasticsearch
+      - cluster.name=es-grafana-agent-cluster
+      - discovery.type=single-node
+    volumes:
+      - elasticsearch_data:/usr/share/elasticsearch/data
+    ports:
+      - "9200:9200"
+
+volumes:
+  elasticsearch_data:
+    driver: local

pkg/integrations/elasticsearch_exporter/elasticsearch_exporter.go

@@ -20,7 +20,7 @@ import (
 )
 
 var DefaultConfig = Config{
-	URI:                       "http://localhost:9200",
+	Address:                   "http://localhost:9200",
 	Timeout:                   5 * time.Second,
 	Node:                      "_local",
 	ExportClusterInfoInterval: 5 * time.Minute,
@@ -33,7 +33,7 @@ type Config struct {
 	// Exporter configuration
 
 	// HTTP API address of an Elasticsearch node.
-	URI string `yaml:"uri"`
+	Address string `yaml:"address"`
 	// Timeout for trying to get stats from Elasticsearch.
 	Timeout time.Duration `yaml:"timeout"`
 	// Export stats for all nodes in the cluster. If used, this flag will override the flag es.node.
@@ -91,12 +91,12 @@ func init() {
 // This function replicates the main() function of github.com/justwatchcom/elasticsearch_exporter
 // but uses yaml configuration instead of kingpin flags.
 func New(logger log.Logger, c *Config) (integrations.Integration, error) {
-	if c.URI == "" {
-		return nil, fmt.Errorf("empty uri provided")
+	if c.Address == "" {
+		return nil, fmt.Errorf("empty elasticsearch_address provided")
 	}
-	esURL, err := url.Parse(c.URI)
+	esURL, err := url.Parse(c.Address)
 	if err != nil {
-		return nil, fmt.Errorf("failed to parse uri: %w", err)
+		return nil, fmt.Errorf("failed to parse elasticsearch_address: %w", err)
 	}
 
 	// returns nil if not provided and falls back to simple TCP.