Commits on Oct 14, 2022

1. metrics/family: Fix race condition in Family::get_or_create …

   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>

   

   nox authored and mxinden committed Oct 14, 2022
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2. CHANGELOG: Prepare v0.18.1 …

   Signed-off-by: Max Inden <mail@max-inden.de>

   

   mxinden committed Oct 14, 2022
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3. Merge pull request prometheus#103 from mxinden/release-v0.18 …

   *: Prepare v0.18.1

   

   mxinden committed Oct 14, 2022
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4. Merge branch 'release-v0.18' into release-v0.18-to-master …

   Signed-off-by: Max Inden <mail@max-inden.de>

   

   mxinden committed Oct 14, 2022
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