Math expression on AWS Cloudwatch metrics is not giving expected output

Question

I have 2 metrics say m1 and m2 on my logs which will provide the sum of some patterns, Now I wanted to add math expression in metric to sum these metrics so I did SUM([m1,m2]), but it is not giving me the result.

Can someone help me to find out if I'm missing something here?

Answer 1

SUM() function will sum up values per data point. 

You can update the metric filter on the logs to emit the value 0 as default if no Failed events are encountered. And then add a new expression to the graph, FILL(m1,0), with ID eg.'e3' which will give a continuous line with zeros when there are no failures and the number of failures in case of failures. Then you can update your SUM expression to SUM([m2,e3]), you can do this on both of your metrics.

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You can also refer to the below video tutorial to know more about AWS CloudWatch.