fix: show every host only once in conlusion of K003
Description
K003: show every host only once in conlusion of K003
Related issue
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Examples
[P1] For some query groups, `total_time` > 30% of overall timing, observed on: nodes: `test-host-1` and `test-host-2`.
instead
[P1] For some query groups, `total_time` > 30% of overall timing, observed on: nodes: `test-host-1`, `test-host-1`, `test-host-2` and `test-host-2`.