Add Elasticsearch Exporter to Alloy

Author: alhendrickson

.devcontainer/devcontainer.json

@@ -24,5 +24,12 @@
 	// "remoteUser": "root"
 	"workspaceFolder": "${localWorkspaceFolder}",
 	"workspaceMount": "source=${localWorkspaceFolder},target=${localWorkspaceFolder},type=bind",
+	"customizations": {
+		"vscode": {
+			"extensions": [
+				"Grafana.grafana-alloy"
+			]
+		}
+	},
 
 }

observability/examples/alloy/docker-compose.yml

@@ -54,7 +54,8 @@ services:
     ports:
       - "12345:12345"
     volumes:
-      - ${BASE_DIR-.}/grafana-alloy/config.alloy:/etc/alloy/config.alloy
+      - ${BASE_DIR-.}/grafana-alloy:/etc/alloy
+      # - ${BASE_DIR-.}/grafana-alloy/advanced/elasticsearch.alloy:/etc/alloy/elasticsearch.alloy # Enable Elastic Exporter
       # CAdvisor
       - /:/rootfs:ro
       - /var/run:/var/run:rw

observability/examples/alloy/grafana-alloy/advanced/elasticsearch.alloy

@@ -0,0 +1,29 @@
+
+prometheus.exporter.elasticsearch "elasticsearch" {
+    address = "https://host.docker.internal:9200"
+    basic_auth {
+        username = sys.env("ELASTICSEARCH_USERNAME")
+        password =  sys.env("ELASTICSEARCH_PASSWORD")
+    }
+    ssl_skip_verify = true
+
+}
+discovery.relabel "elasticsearch" {
+    targets = prometheus.exporter.elasticsearch.elasticsearch.targets
+
+    rule {
+        target_label    = "cluster"
+        replacement     = "elasticsearch-cogstack-cluster"
+    }
+    rule {
+        target_label    = "host"
+        replacement     = "elasticsearch_host"
+    }
+}
+
+prometheus.scrape "elasticsearch_exporter" {
+    scrape_interval = "15s"
+    targets    =  discovery.relabel.elasticsearch.output
+    forward_to = [prometheus.remote_write.default.receiver]
+
+}

observability/examples/alloy/grafana-alloy/config.alloy

@@ -3,14 +3,18 @@ logging {
   format = "logfmt"
 }
 
+livedebugging {
+  enabled = true
+}
+
 prometheus.remote_write "default" {
   endpoint {
     url = sys.env("PROMETHEUS_URL")
   }
   external_labels = {
     host = sys.env("ALLOY_HOSTNAME"),
     ip_address = sys.env("ALLOY_IP_ADDRESS"),
-  }
+  } 
 }
 
 prometheus.scrape "exporter" {