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Trying to write a cloud watch insights query to concatenate error messages for the same timestamp to be displayed as one row rather than multiple rows in the result.

So far I have tried the below query.

fields @timestamp,concat(@message) | filter @message like /(?i)(Exception|error|fail|)/ | limit 20

This displays the results are below.

2019-09-12T12:17:09.803+10:00 12:17:09,720 |-ERROR in A 2019-09-12T12:17:09.803+10:00 12:17:09,720 |-ERROR in B 2019-09-12T12:17:09.803+10:00 12:17:09,720 |-ERROR in C

I am expecting the below result.

2019-09-12T12:17:09.803+10:00 12:17:09,720 |- ERROR in A -ERROR in B -ERROR in C

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  • code correction filter @message like /(?i)(Exception|ERROR|fail)/ Commented Sep 13, 2019 at 6:09

1 Answer 1

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The concat operator is not an aggregating function, so will not do what you are looking for.

Rather, it is used for concatinating multiple values in a single row, e.g. 

fields @timestamp, concat("Got message ", @message, " from stream ", @logStream)

would give you 

| 2019-09-12T12:17:09.803+10:00 12:17:09,720 | Got message bla from stream some_log_stream |

As far as I know there is no way to aggregate strings from multiple rows into a single row.

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