feat: add Loki + Promtail logging stack

apps/loki/promtail-configmap.yaml

@@ -0,0 +1,72 @@
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: promtail-config
+  namespace: loki
+  labels:
+    app.kubernetes.io/name: promtail
+data:
+  promtail.yaml: |
+    server:
+      http_listen_port: 3101
+      grpc_listen_port: 0
+      log_level: info
+
+    positions:
+      filename: /run/promtail/positions.yaml
+
+    clients:
+      - url: http://loki:3100/loki/api/v1/push
+        tenant_id: ""
+        batchwait: 1s
+        batchsize: 1048576
+        timeout: 10s
+
+    scrape_configs:
+      - job_name: kubernetes-pods
+        kubernetes_sd_configs:
+          - role: pod
+        pipeline_stages:
+          - cri: {}
+          - labeldrop:
+              - filename
+              - stream
+        relabel_configs:
+          - source_labels: [__meta_kubernetes_pod_annotation_promtail_io_scrape]
+            action: drop
+            regex: "false"
+          - source_labels: [__meta_kubernetes_namespace]
+            action: replace
+            target_label: namespace
+          - source_labels: [__meta_kubernetes_pod_name]
+            action: replace
+            target_label: pod
+          - source_labels: [__meta_kubernetes_pod_container_name]
+            action: replace
+            target_label: container
+          - source_labels: [__meta_kubernetes_pod_node_name]
+            action: replace
+            target_label: node
+          - source_labels: [__meta_kubernetes_pod_label_app]
+            action: replace
+            target_label: app
+          - source_labels: [__meta_kubernetes_pod_label_app_kubernetes_io_name]
+            action: replace
+            target_label: app
+          - replacement: /var/log/pods/*$1/*.log
+            separator: /
+            source_labels:
+              - __meta_kubernetes_pod_uid
+              - __meta_kubernetes_pod_container_name
+            target_label: __path__
+
+      - job_name: journal
+        journal:
+          max_age: 12h
+          labels:
+            job: systemd-journal
+        relabel_configs:
+          - source_labels: ["__journal__systemd_unit"]
+            target_label: unit
+          - source_labels: ["__journal__hostname"]
+            target_label: node