///////////////////////////////
//     Service Discovery     //
///////////////////////////////

discovery.kubernetes "pods" {
	role = "pod"

	// Filter selected pods to "quickpizza" namespace
	namespaces {
		names = ["quickpizza"]
	}
}

discovery.relabel "k8s_pods" {
	targets = discovery.kubernetes.pods.targets

	rule {
		source_labels = ["__meta_kubernetes_namespace"]
		action        = "replace"
		target_label  = "namespace"
	}

	rule {
		source_labels = ["namespace"]
		target_label  = "service_namespace"
	}

	// Add pod name as the label: pod
	rule {
		source_labels = ["__meta_kubernetes_pod_name"]
		target_label  = "pod"
	}
	// Add container name as the label: container
	rule {
		source_labels = ["__meta_kubernetes_pod_container_name"]
		target_label  = "container"
	}
	// Use value of the pod label app.kubernetes.io/instance as the label: service_name
	rule {
		source_labels = ["__meta_kubernetes_pod_label_app_kubernetes_io_instance"]
		target_label  = "service_name"
	}
}

////////////////////////////////
//     Prometheus Metrics     //
////////////////////////////////

prometheus.scrape "app" {
	// Use the output of the relabled pods 
	targets = discovery.relabel.k8s_pods.output
	// Forward to Grafana Cloud Metrics
	forward_to = [prometheus.relabel.app.receiver]
	// Set scrape interval to 15s
	scrape_interval = "15s"
}

prometheus.relabel "app" {
	// forward to Grafana Cloud
	forward_to = [prometheus.remote_write.grafana_cloud.receiver]

	rule {
		// specify the action to drop the metric
		action = "drop"

		source_labels = ["__name__"]
		// specify a pattern to match the `go_info` metric
		regex = "go_info"
	}
}

prometheus.remote_write "grafana_cloud" {
	endpoint {
		url = convert.nonsensitive(remote.kubernetes.secret.creds.data["metrics_url"])

		basic_auth {
			username = convert.nonsensitive(remote.kubernetes.secret.creds.data["metrics_user"])
			password = remote.kubernetes.secret.creds.data["access_token"]
		}
	}
}

/////////////////////////////////
//     Kubernetes Pod Logs     //
/////////////////////////////////

// Kubernetes Pod Logs
loki.source.kubernetes "pods" {
	// Target the k8s pods
	targets = discovery.relabel.k8s_pods.output
	// Forward to Grafana Cloud Logs
	forward_to = [loki.write.grafana_cloud.receiver]
}

loki.write "grafana_cloud" {
	endpoint {
		url = convert.nonsensitive(remote.kubernetes.secret.creds.data["logs_url"]) + "/loki/api/v1/push"

		basic_auth {
			username = convert.nonsensitive(remote.kubernetes.secret.creds.data["logs_user"])
			password = remote.kubernetes.secret.creds.data["access_token"]
		}
	}
}

///////////////////////////
//     Miscellaneous     //
///////////////////////////

remote.kubernetes.secret "creds" {
	name      = "grafana-cloud-credentials"
	namespace = sys.env("NAMESPACE")
}