devenv: grafana high availability (ha) test setup

devenv/docker/ha_test/prometheus/prometheus.yml

@@ -0,0 +1,39 @@
+# my global config
+global:
+  scrape_interval:     10s # By default, scrape targets every 15 seconds.
+  evaluation_interval: 10s # By default, scrape targets every 15 seconds.
+  # scrape_timeout is set to the global default (10s).
+
+# Load and evaluate rules in this file every 'evaluation_interval' seconds.
+#rule_files:
+# - "alert.rules"
+# - "first.rules"
+# - "second.rules"
+
+# alerting:
+#   alertmanagers:
+#   - scheme: http
+#     static_configs:
+#     - targets:
+#       - "127.0.0.1:9093"
+
+scrape_configs:
+  - job_name: 'prometheus'
+    static_configs:
+      - targets: ['localhost:9090']
+
+  - job_name: 'grafana'
+    dns_sd_configs:
+      - names:
+        - 'grafana'
+        type: 'A'
+        port: 3000
+        refresh_interval: 10s
+
+  # - job_name: 'mysql'
+  #   dns_sd_configs:
+  #     - names:
+  #       - 'mysqld-exporter'
+  #       type: 'A'
+  #       port: 9104
+  #       refresh_interval: 10s