Fix race condition with Exemplar in Counter

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Potential fix for #1145.

Signed-off-by: Fabian Stäber [email protected]

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Build fails with

Error: File is not `gofumpt`-ed with `-extra` (gofumpt)

Was that me, or is that an issue with the build pipeline?

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Thanks Bryan. I added a comment. Not sure why the linter had failed, but now it's green again.