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Clarify behaviour of metric names with bool modifier

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Based on discussion in https://github.com/prometheus/prometheus/issues/15471

Signed-off-by: Charles Korn <charles.korn@grafana.com>
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Charles Korn 2025-06-11 13:30:16 +10:00
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@ -139,6 +139,12 @@ modifier changes the behavior in the following ways:
than the value `0`.)
* The metric name is dropped.
If the `bool` modifier is not provided, then the metric name from the left side
is retained, with some exceptions:
* If `on` is used, then the metric name is dropped.
* If `group_right` is used, then the metric name from the right side is retained,
to avoid collisions.
### Logical/set binary operators
These logical/set binary operators are only defined between instant vectors: