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count() result is inaccurate #5461

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slim-bean opened this issue Feb 23, 2022 · 1 comment · Fixed by #5474
Closed

count() result is inaccurate #5461

slim-bean opened this issue Feb 23, 2022 · 1 comment · Fixed by #5474

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@slim-bean
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Describe the bug

When comparing the number of returned series from a query to the same query with count() wrapped around it the results are different.

The same count query sent directly to a querier and bypassing the query-frontend returns the correct result.
@cyriltovena
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logfmt will returns labels that will be the same across different shard
the only way to fix it is to shard the sum but not the count.

count is distinct count so you can’t have it once you mutate labels across shards.

@cyriltovena cyriltovena mentioned this issue Feb 24, 2022
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Disable sharding of count/avg when labels are mutated cyriltovena/loki
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@cyriltovena @slim-bean