After each execution of your checks there is a possibility to execute some commands.


    "type": "disk-space",
    "input": {
        "dir": "/",
        "min_req_space": "6"
    "hooks": {
        "on_each_up": [
            "rm -f /tmp/maintenance.html"
        "on_each_down": [
            "echo \"Site under maintenance\" > /tmp/maintenance.html"

Example above will delete a /tmp/maintenance.html file when disk space will be at acceptable level. If there will be no enough disk space, then “Site under maintenance” will be written to the /tmp/maintenance.html With this practical example you can add a rule to your NGINX/Apache gateway to show a maintenance page, when a file is present.