limit cloudwatch metrics for linux disk to /, other mount points are irrelevant (#956)

Author: jeanschmidt

terraform-aws-github-runner/modules/runners/templates/cloudwatch_config_linux.json

@@ -19,7 +19,7 @@
     ],
     "metrics_collection_interval": 10,
     "resources": [
-      "*"
+      "/"
     ]
   },
   "diskio": {
@@ -28,7 +28,7 @@
     ],
     "metrics_collection_interval": 10,
     "resources": [
-      "*"
+      "/"
     ]
   },
   "mem": {