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consul/.changelog/9440.txt

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Fix bug in usage metrics when multiple service instances are changed in a single transaction (#9440) * Fix bug in usage metrics that caused a negative count to occur There were a couple of instances were usage metrics would do the wrong thing and result in incorrect counts, causing the count to attempt to decrement below zero and return an error. The usage metrics did not account for various places where a single transaction could delete/update/add multiple service instances at once. We also remove the error when attempting to decrement below zero, and instead just make sure we do not accidentally underflow the unsigned integer. This is a more graceful failure than returning an error and not allowing a transaction to commit. * Add changelog
2021-01-12 21:31:47 +00:00
```release-note:bug
state: fix computation of usage metrics to account for various places that can modify multiple services in a single transaction.
```