Temp-adding alloy.config for review

Author: irapandey

hack/observability/alloy/config.alloy

@@ -0,0 +1,120 @@
+discovery.kubernetes "kubernetes_pods" {
+	role = "pod"
+}
+
+discovery.relabel "kubernetes_pods" {
+	targets = discovery.kubernetes.kubernetes_pods.targets
+
+	rule {
+		source_labels = ["__meta_kubernetes_pod_controller_name"]
+		regex         = "([0-9a-z-.]+?)(-[0-9a-f]{8,10})?"
+		target_label  = "__tmp_controller_name"
+	}
+
+	rule {
+		source_labels = ["__meta_kubernetes_pod_label_app_kubernetes_io_name", "__meta_kubernetes_pod_label_app", "__tmp_controller_name", "__meta_kubernetes_pod_name"]
+		regex         = "^;*([^;]+)(;.*)?$"
+		target_label  = "app"
+	}
+
+	rule {
+		source_labels = ["__meta_kubernetes_pod_label_app_kubernetes_io_instance", "__meta_kubernetes_pod_label_instance"]
+		regex         = "^;*([^;]+)(;.*)?$"
+		target_label  = "instance"
+	}
+
+	rule {
+		source_labels = ["__meta_kubernetes_pod_label_app_kubernetes_io_component", "__meta_kubernetes_pod_label_component"]
+		regex         = "^;*([^;]+)(;.*)?$"
+		target_label  = "component"
+	}
+
+	rule {
+		source_labels = ["__meta_kubernetes_pod_node_name"]
+		target_label  = "node_name"
+	}
+
+	rule {
+		source_labels = ["__meta_kubernetes_namespace"]
+		target_label  = "namespace"
+	}
+
+	rule {
+		source_labels = ["namespace", "app"]
+		separator     = "/"
+		target_label  = "job"
+	}
+
+	rule {
+		source_labels = ["__meta_kubernetes_pod_name"]
+		target_label  = "pod"
+	}
+
+	rule {
+		source_labels = ["__meta_kubernetes_pod_container_name"]
+		target_label  = "container"
+	}
+
+	rule {
+		source_labels = ["__meta_kubernetes_pod_uid", "__meta_kubernetes_pod_container_name"]
+		separator     = "/"
+		target_label  = "__path__"
+		replacement   = "/var/log/pods/*$1/*.log"
+	}
+
+	rule {
+		source_labels = ["__meta_kubernetes_pod_annotationpresent_kubernetes_io_config_hash", "__meta_kubernetes_pod_annotation_kubernetes_io_config_hash", "__meta_kubernetes_pod_container_name"]
+		separator     = "/"
+		regex         = "true/(.*)"
+		target_label  = "__path__"
+		replacement   = "/var/log/pods/*$1/*.log"
+	}
+}
+
+local.file_match "kubernetes_pods" {
+	path_targets = discovery.relabel.kubernetes_pods.output
+}
+
+loki.process "kubernetes_pods" {
+	forward_to = [loki.write.default.receiver]
+
+	stage.cri { }
+
+	stage.json {
+		expressions = {
+			Cluster             = "join('/',[Cluster.namespace,Cluster.name])",
+			KubeadmControlPlane = "join('/',[KubeadmControlPlane.namespace,KubeadmControlPlane.name])",
+			Machine             = "join('/',[Machine.namespace,Machine.name])",
+			MachineDeployment   = "join('/',[MachineDeployment.namespace,MachineDeployment.name])",
+			MachinePool         = "join('/',[MachinePool.namespace,MachinePool.name])",
+			MachineSet          = "join('/',[MachineSet.namespace,MachineSet.name])",
+			controller          = "",
+		}
+	}
+
+	stage.labels {
+		values = {
+			Cluster             = null,
+			KubeadmControlPlane = null,
+			Machine             = null,
+			MachineDeployment   = null,
+			MachinePool         = null,
+			MachineSet          = null,
+			controller          = null,
+		}
+	}
+}
+
+loki.source.file "kubernetes_pods" {
+	targets               = local.file_match.kubernetes_pods.targets
+	forward_to            = [loki.process.kubernetes_pods.receiver]
+	legacy_positions_file = "/run/promtail/positions.yaml"
+}
+
+loki.write "default" {
+	endpoint {
+		url       = "http://loki:3100/loki/api/v1/push"
+		tenant_id = "1"
+	}
+	external_labels = {}
+}