Add prometheus metrics to alloy

variables.tf

@@ -139,6 +139,13 @@ variable "services" {
       interval = optional(string)
       conditions = optional(list(string))
     }))
+    metrics = optional(list(object({
+      path = string
+      address  = optional(string)
+      instance = optional(string)
+      job = optional(string)
+      interval = optional(string)
+    })))
     ports = optional(list(object({
       description = string
       port = string