body common control
{
    bundlesequence => { "blackout" };
}

body agent control
{
    abortclasses => { "abort_cfagent" };
}

bundle agent blackout
{
    vars:

        any::

            "blackout_file" string => "/tmp/cf_blackout";

    classes:

        "abort_cfagent" expression => fileexists("$(blackout_file)"),
            comment => "Abort execution of cf-agent";
}