Merge release-v0.18 back into master
#104
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The method should not overwrite an existing key after it obtains the write lock. Consider the following scenario with `Family<LabelSet, Gauge>` used by threads A and B: 1. A and B both call `family.get_or_insert(&label_set)` 2. A and B both acquire read lock and finds no key 3. A gets write lock and inserts a new gauge with value 0 4. A increments returned gauge to 1 5. B gets write lock and inserts a new gauge with value 0 6. B increments returned gauge to 1 7. A decrements gauge back to 0 8. B decrements gauge which now overflows to `u64::MAX` Signed-off-by: Anthony Ramine <nox@nox.paris>
Signed-off-by: Max Inden <mail@max-inden.de>
*: Prepare v0.18.1
Signed-off-by: Max Inden <mail@max-inden.de>
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Follow up to #103. See also #102.