match external labels in exemplars API #4123
Merged
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Signed-off-by: yeya24 yb532204897@gmail.com
Fixes #4116
Changes
Add logic of matching external labels in the exemplars API proxy.
The matching part is a little bit complex because the input is a query, which might contain multiple vector selectors.
We need to match each vector selector separately and construct the final query after all matches are processed.
Verification
Tested locally and one unit test.
We don't have an E2E test for exemplars now so no E2E test added.