Example Sensu check, which only alerts after 10 failures on a 60 second interval, and won't alert on nights or weekends.

queue_checks.json

{
    "checks": {
        "noisy_queue_check": {
            "handler": "default",
            "command": "/etc/sensu/plugins/check-queue-length.rb",
            "interval": 60,
            "refresh": 60,
            "occurrences": 10,
            "subscribers": [
                "workers"
            ],
            "subdue": {
                "start": "22:00-05:00",
                "end": "06:00-05:00",
                "days": [
                    "saturday",
                    "sunday"
                ]
            }
        }
    }
}