adding node exporter, loki, and promtail

addon-promtail-main/rootfs/etc/promtail/base_config.yaml

@@ -0,0 +1,11 @@
+---
+server:
+  http_listen_port: 9080
+  grpc_listen_port: 0
+  log_level: "${LOG_LEVEL}"
+
+positions:
+  filename: /data/promtail/positions.yaml
+
+clients:
+  - url: "${URL}"

addon-promtail-main/rootfs/etc/promtail/default-scrape-config.yaml

@@ -0,0 +1,27 @@
+---
+- job_name: journal
+  journal:
+    json: false
+    max_age: 12h
+    labels:
+      job: systemd-journal
+    path: "${JOURNAL_PATH}"
+  relabel_configs:
+    - source_labels:
+        - __journal__systemd_unit
+      target_label: unit
+    - source_labels:
+        - __journal__hostname
+      target_label: nodename
+    - source_labels:
+        - __journal_syslog_identifier
+      target_label: syslog_identifier
+    - source_labels:
+        - __journal_container_name
+      target_label: container_name
+  pipeline_stages:
+    - match:
+        selector: '{container_name=~"homeassistant|hassio_supervisor"}'
+        stages:
+          - multiline:
+              firstline: '^\x{001b}'