fix: set service argparse default to None to respect anyconfig map (#31)

docs/content/configuration/env.md

@@ -13,14 +13,14 @@ PROMETHEUS_PVE_SD_LOG_LEVEL=warning
 # supported log formats: console|json|simple
 PROMETHEUS_PVE_SD_LOG_FORMAT=console
 
-METRICS_ENABLED=true
-METRICS_ADDRESS=127.0.01
-METRICS_PORT=8000
+PROMETHEUS_PVE_SD_METRICS_ENABLED=true
+PROMETHEUS_PVE_SD_METRICS_ADDRESS=127.0.01
+PROMETHEUS_PVE_SD_METRICS_PORT=8000
 
 PROMETHEUS_PVE_SD_OUTPUT_FILE=
 PROMETHEUS_PVE_SD_LOOP_DELAY=300
 
-# Run pve sd in a loop and discover hosts every n seconds (as defined in PROMETHEUS_PVE_SD_LOOP_DELAY).
+# Run PVE SD in a loop and discover hosts every n seconds (as defined in PROMETHEUS_PVE_SD_LOOP_DELAY).
 # Can be disabled to run disovery only once.
 PROMETHEUS_PVE_SD_SERVICE=true
 

prometheuspvesd/cli.py

@@ -74,7 +74,11 @@ class PrometheusSD:
             help="delay between discovery runs"
         )
         parser.add_argument(
-            "--no-service", dest="service", action="store_false", help="run discovery only once"
+            "--no-service",
+            dest="service",
+            action="store_false",
+            default=None,
+            help="run discovery only once"
         )
         parser.add_argument(
             "-f",