sensu-server.log

{
    "timestamp": "2014-02-12T14:21:39.059281+0000",
    "level": "info",
    "message": "handling event",
    "event": {
        "client": {
            "name": "server",
            "address": "server_ip",
            "subscriptions": [
                "foo",
                "bar",
                "server_name"
                ],
            "load": {
                "warn": "3",
                "crit": "4"
            },
            "disk_free": {
                "warn": "15%",
                "crit": "10%"
            },
            "mem_used": {
                "warn": "90",
                "crit": "95"
            },
            "list_count": {
                "warn": "9000",
                "crit": "10000"
            },
            "redis_key": {
                "value": "logstash"
            },
            "timestamp": 1392214885
        },
        "check": {
            "handlers": [
                "twitter"
            ],
            "command": "/etc/sensu/plugins/check_redis.rb -c 20 -w 10 -h redis_server -k logstash-ML",
            "interval": 60,
            "refresh": 120,
            "flapping": false,
            "subscribers": [
                "server_name"
            ],
            "name": "check_redis-ML",
            "issued": 1392214898,
            "executed": 1392214898,
            "output": "CRITICAL_text_output\n",
            "status": 2,
            "duration": 0.136,
            "history": [
                "2",
                "0",
                "2",
                "2",
                "0",
                "2",
                "2",
                "2",
                "0",
                "0",
                "0",
                "0",
                "2",
                "2",
                "2",
                "2",
                "0",
                "2",
                "2",
                "2",
                "2"
            ]
        },
        "occurrences": 4,
        "action": "create"
    },
    "handler": {
        "type": "pipe",
        "command": "/etc/sensu/handlers/twitter.rb",
        "name": "twitter"
    }
}