Chore: Add mysqld exporter to devenv (#55773)

Co-authored-by: Marcus Efraimsson <marcus.efraimsson@gmail.com>

devenv/docker/blocks/mysql_exporter/.env

@@ -0,0 +1 @@
+mysql_exporter_tag=v0.14.0

devenv/docker/blocks/mysql_exporter/docker-compose.yaml

@@ -0,0 +1,6 @@
+  mysql-exporter:
+    image: prom/mysqld-exporter:${mysql_exporter_tag}
+    ports:
+      - "9104:9104"
+    volumes:
+      - ./docker/blocks/mysql_exporter/mysql-exporter.cnf:/home/.my.cnf

devenv/docker/blocks/mysql_exporter/mysql-exporter.cnf

@@ -0,0 +1,5 @@
+[client]
+host=mysql
+port=3306
+user=grafana
+password=password

devenv/docker/blocks/prometheus/prometheus.yml

@@ -38,6 +38,9 @@ scrape_configs:
     static_configs:
       - targets: ['prometheus-random-data:8080']
 
+  - job_name: 'mysql'
+    static_configs:
+      - targets: ['mysql-exporter:9104']
   # - job_name: 'grafana-test-datasource'
   #   metrics_path: /metrics/plugins/grafana-test-datasource
   #   static_configs: