feat(observability): add observability labels and logging configuration for backend, migrate, and web services

compose.production.yaml

@@ -1,6 +1,17 @@
 # Independent production configuration; do not merge with compose.yaml.
 name: wq-alpha-production
 
+x-observability-labels: &observability-labels
+  observability.logs: "true"
+  observability.project: "wq-alpha"
+  observability.env: "production"
+
+x-container-logging: &container-logging
+  driver: json-file
+  options:
+    max-size: "20m"
+    max-file: "5"
+
 x-backend: &backend
   image: wq-alpha-production-backend:${DEPLOY_TAG:-local}
   build:
@@ -28,6 +39,10 @@ x-backend: &backend
 services:
   backend:
     <<: *backend
+    labels:
+      <<: *observability-labels
+      observability.service: "backend"
+    logging: *container-logging
     # Migration is run separately with all application writers stopped.
     command: [uvicorn, 'app.main:create_app', --factory, --host, 0.0.0.0, --port, '8000', --workers, '1', --proxy-headers]
     healthcheck:
@@ -40,10 +55,18 @@ services:
     restart: unless-stopped
   migrate:
     <<: *backend
+    labels:
+      <<: *observability-labels
+      observability.service: "migrate"
+    logging: *container-logging
     profiles: [jobs]
     command: [alembic, upgrade, head]
     restart: 'no'
   web:
+    labels:
+      <<: *observability-labels
+      observability.service: "web"
+    logging: *container-logging
     image: wq-alpha-production-web:${DEPLOY_TAG:-local}
     build:
       context: .