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In my configuration, each build run several tests on different setups, so in the end of the running there are several junit xml files - one per setup.
Is there any way to do aggregation for all those files, so it will be possible to see one summary for all in build overview tab?
You may collect these files into a single node and directory (using step input/output to collect files from different nodes) and then run a single JUnit report publish for these files.