Add Dawarich stack

apps/dawarich/prometheus-scrape.snippet.yml

@@ -0,0 +1,18 @@
+# Dawarich 1.8.1 serves the Prometheus endpoint on the web service at
+# /metrics. Port 9394 is the internal Sidekiq metrics endpoint consumed by
+# dawarich_app via SIDEKIQ_METRICS_URL.
+#
+# Prerequisites in monitoring/docker-compose.yml:
+# - attach service `prometheus` to external `backend_net`
+# - mount Docker secret/file `/mnt/user/appdata/secrets/dawarich_metrics_password.txt`
+#   into the Prometheus container at `/run/secrets/dawarich_metrics_password`
+
+- job_name: dawarich
+  metrics_path: /metrics
+  scheme: http
+  basic_auth:
+    username: prometheus
+    password_file: /run/secrets/dawarich_metrics_password
+  static_configs:
+    - targets:
+        - dawarich_app:3000