我用的是logstash-7.9.0

Input Config - 
  cloudwatch {
    namespace  => "AWS/Lambda"
    type       => "cloudwatch_lambda"
    metrics    => [ "Duration", "Errors" ]
    tags       => [ "application-logs", "lambda-metric-logs" ]
    statistics => ["Average"]
    filters    => { "FunctionName" => "<name_of_the_function>" }
    interval   => 900
    region     => "$REGION"
  }

输出-

{
    "level": "INFO",
    "loggerName": "logstash.inputs.cloudwatch",
    "timeMillis": 1606241295784,
    "thread": "[main]<cloudwatch",
    "logEvent": {
        "message": "[Aws::CloudWatch::Client 200 0.066722 0 retries] get_metric_statistics(namespace:\"AWS/Lambda\",metric_name:\"Duration\",start_time:2020-11-24 17:53:15 UTC,end_time:2020-11-24 18:08:15 UTC,period:300,statistics:[\"Average\"],dimensions:[{name:\"FunctionName\",value:\"[FILTERED]\"}])  \n"
    }
}

输出不会在消息字段中返回任何数据