No timestamp in Clouwatch logs

[quocvu]

The timestamp field is not logged in Cloudwatch. I only see this much in my CW logs. Is this a configuration issue?

{
    "name": "web-monitor",
    "hostname": "my-foo-host",
    "pid": 3411,
    "level": 20,
    "msg": "Error count is 6",
    "v": 0
}

[cbcaio]

same here, locally timestamp is fine but when I check cw its just not there