Tracing support with custom metrics collection (#67)

* Init tracing support

* Update xray exporter

* Remove duplicate metrics only on daemon set

* Add support for custom metrics collection

* Remove experimental feature

* Rename config items

* Update requirements for tracing support

modules/workloads/infra/variables.tf

@@ -156,3 +156,30 @@ variable "prometheus_config" {
   }
   nullable = false
 }
+
+variable "enable_tracing" {
+  description = "(Experimental) Enables tracing with AWS X-Ray. This changes the deploy mode of the collector to daemon set. Requirement: adot add-on <= 0.58-build.0"
+  type        = bool
+  default     = false
+}
+
+variable "enable_custom_metrics" {
+  description = "Allows additional metrics collection for config elements in the `custom_metrics_config` config object. Automatic dashboards are not included"
+  type        = bool
+  default     = false
+}
+
+variable "custom_metrics_config" {
+  description = "Configuration object to enable custom metrics collection"
+  type = object({
+    ports = list(number)
+    # paths = optional(list(string), ["/metrics"])
+    # list of samples to be dropped by label prefix, ex: go_ -> discards go_.*
+    dropped_series_prefixes = list(string)
+  })
+
+  default = {
+    ports                   = []
+    dropped_series_prefixes = ["unspecified"]
+  }
+}