Escape boolean values in YAML

Monitoring.md

@@ -10,7 +10,7 @@ services:
   # netbox
   netbox:
     environment:
-      METRICS_ENABLED: true
+      METRICS_ENABLED: 'true'
     volumes:
     - type: tmpfs
       target: /tmp/metrics
@@ -34,7 +34,7 @@ services:
       DATA_SOURCE_URI: postgres?sslmode=disable
       DATA_SOURCE_USER: netbox
       DATA_SOURCE_PASS: J5brHrAXFLQSif0K
-      PG_EXPORTER_AUTO_DISCOVER_DATABASES: true
+      PG_EXPORTER_AUTO_DISCOVER_DATABASES: 'true'
 
   # redis
   redis-worker-exporter: