问题
Suppose I have N EC2 instances in auto-scaling group, each of them is polling M SQS queues. How would I create an alarm on cumulative ApproximateNumberOfMessagesVisible across all SQS queues if possible?
回答1:
There is no cumulative count of the visible messages metric available as of now.
Here is how you can solve it,
Create a Lambda/ cron job that can poll the queues, get ApproximateNumberOfMessages on each queue and update the total messages to a custom Cloudwatch Metric.
QueueAttributes:
http://docs.aws.amazon.com/AWSSimpleQueueService/latest/APIReference/API_GetQueueAttributes.html
Custom Cloudwatch Metric:
http://docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring/publishingMetrics.html
You can either create a lambda (serverless) or if you want to server based, you can poll and update total count into a custom cloudwatch metric with cli to AWS cloudwatch.
Once you have have the cloudwatch metric, you can create an alarm based on those numbers.
Hope it helps.
来源：https://stackoverflow.com/questions/46375981/create-cloudwatch-alarm-on-multiple-sqs-queues