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Bryan Boreham 2e2c014d52 Labels: optimise creation of signature with/without labels (#10667) ... * Labels: create signature with/without labels Instead of creating a new Labels slice then converting to signature, go directly to the signature and save time. Signed-off-by: Bryan Boreham <bjboreham@gmail.com> * Labels: refactor Builder tests Have one test with a range of cases, and have them check the final output rather than checking the internal structure of the Builder. Also add a couple of cases where the value is "", which should be interpreted as 'delete'. Signed-off-by: Bryan Boreham <bjboreham@gmail.com> * Labels: add 'Keep' function to Builder This lets us replace `Labels.WithLabels` with the more general `Builder`. In `engine.resultMetric()` we can call `Keep()` instead of checking and calling `Del()`. Avoid calling `Sort()` in `Builder.Labels()` if we didn't add anything, so that `Keep()` has the same performance as `WithLabels()`. Signed-off-by: Bryan Boreham <bjboreham@gmail.com>		3 years ago
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labels	Labels: optimise creation of signature with/without labels (#10667)	3 years ago
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