Retract Prometheus server for OpenBSD

[Julien Pivotto]

Hello,

It seems that Prometheus for OpenBSD is no longer working since
Prometheus 2.19.
The sementics around memory mapping are very different from the other
operating systems. The experts in the github issue have tracked this
down to the lack of a unified buffer cache for mmap for OpenBSD.

This seems to me that Prometheus simply does not work on that platform.

I propose we remove OpenBSD from the Prometheus build and release list, and add CI
for other OS', like freebsd etc.

If the community wants to add support back, we would need benchmarks to
see the impact on the other operating systems of the proposed solution.

https://github.com/prometheus/prometheus/issues/8799
https://github.com/prometheus/prometheus/issues/8877

Regards,

--
Julien Pivotto
@roidelapluie

[Julien Pivotto]

Note: I am obviously also happy if someone from the community is willing
to do the work, or to provide any other kind of help to make this work
again.

If the facts in the github issues are not correct and you run Prometheus
2.19+ on OpenBSD without issue, please let us know as well.

Thanks.

--
Julien Pivotto
@roidelapluie

[David Leadbeater]

[+claudio, openbsd port maintainer]

It has been a year since Julien's message above, given there hasn't
been a fix for this issue I think we should more strongly warn people
before they consider running Prometheus on OpenBSD.

Please would it be possible to put a note on the Prometheus port that
Prometheus upstream cannot currently recommend Prometheus on OpenBSD,
due to data corruption issues.

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[Julien Pivotto]

There is a proposed fix, but it has not yet been reviewed.

To view this discussion on the web visit https://groups.google.com/d/msgid/prometheus-developers/CAP9KPhBusPprYQj6XqXxrrzq%2B_zmgRtt-6nhYUH7Rn%3DsSLMxgQ%40mail.gmail.com.