How to create one metrics filter for multiple CloudWatch log groups?

Question

I have created Lambda function testA and testB with exactly the same source code.

lambda_function.py
```
def lambda_handler(event, context):
    print(event)
```

Executing these functions will print the value of the event variable to the log groups "/aws/lambda/testA" and "/aws/lambda/testB".  
I want to filter the event variable values in these logs and record them in the same metrics.
How can I create a metrics filter?

Accepted Answer

CloudWatch metric filters are restricted to a single log group.  There is not a way to set up a single metric filter to cover multiple log groups at present.

You can setup one metric filter for each log group. You can then use [Metric Insights](https://docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring/query_with_cloudwatch-metrics-insights.html) to combine those component metrics at query time for either an alarms or dashboards.

How to create one metrics filter for multiple CloudWatch log groups?

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