add prom logic and variables

templates/config.alloy.erb

@@ -1,3 +1,4 @@
+<% if @ay_manage_loki == true -%>
 logging {
   level  = "info"
   format = "logfmt"
@@ -20,4 +21,28 @@ loki.write "loki" {
       password = "<%= @ay_loki_userpass %>"
     }
   }
-}
+}
+<% end -%>
+<% if @ay_manage_prom == true -%>
+// Metrics collection
+prometheus.exporter.unix "system_metrics" {
+  include_exporter_metrics = true
+  disable_collectors       = ["mdadm"]  # Optional: adjust based on your needs
+}
+
+prometheus.scrape "scrape_system" {
+  targets    = prometheus.exporter.unix.system_metrics.targets
+  forward_to = [prometheus.remote_write.prometheus.receiver]
+  scrape_interval = "15s"  # Adjust as needed
+}
+
+prometheus.remote_write "prometheus" {
+  endpoint {
+    url = "<%= @ay_prom_url %>"
+    basic_auth {
+      username = "<%= @ay_loki_username %>"
+      password = "<%= @ay_loki_userpass %>"
+    }
+  }
+}
+<% end %>