client_golang 1.21.0 is released!

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Bartłomiej Płotka

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Feb 19, 2025, 3:55:09 AMFeb 19
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Hi Gophers!

Prometheus client_golang v1.21.0 was released today with various improvements and optimizations thanks to the community!

⚠️ Warning: This release will likely request you to upgrade the github.com/prometheus/common module to 0.62+ version, which contains a potential breaking change. This is only a problem if you depend on the strict, legacy (pre UTF-8) label name validation. Trivial escape hatches exists too. Read more in our release notes.

To ensure compatibility and stability of our releases we are started performing a new RC process with extra validation. Notably, we successfully upgraded one of the biggest OSS users (k8s and Prometheus) to 1.21.0-rc.0 already. If you have any feedback about new process or client_golang, let us know in the issues or #prometheus-client_golang CNCF Slack!

There are some epic optimizations and features baking for the next release, 

Kind Regards,
Bartek Plotka (@bwplotka)

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