Agent flags stability

[Arthur Silva Sens]

Hello everyone,

With the release of Prometheus v2.32.0 agent is finally out of beta, Prometheus-Operator wants to provide support for it as well[1]. So we'd like to ask what does moving out of beta actually means :)

The next release of Prometheus-Operator will make it possible to in Agent mode using the Prometheus CRD, however, it does require the user to override flags that are hard-coded ("storage.tsdb.path" and "storage.tsdb.retention")[2][3]. This kind of manual override[4] goes against what we recommend our users to do, but unfortunately, it is the only way to run Prometheus in Agent mode with Prometheus-Operator at the moment.

Do you think that AgentOnly and ServerOnly flags are likely to change in a near future? If not, then I think we're good to go to improve the UX around Agent mode in Prometheus-Operator :)

[1] https://github.com/prometheus-operator/prometheus-operator/issues/3989

[2] https://github.com/prometheus-operator/prometheus-operator/blob/787f54b055f797464d5832ace1c7f8318321c87a/pkg/prometheus/statefulset.go#L360

[3] https://github.com/prometheus-operator/prometheus-operator/blob/787f54b055f797464d5832ace1c7f8318321c87a/pkg/prometheus/statefulset.go#L349

[4] https://github.com/paulfantom/kube-prometheus/pull/3#discussion_r760028783

[Julius Volz]

Hi Arthur,

Others can provide more input about Agent-mode specifics and the most likely changes in that realm, but definitely it's still considered an experimental feature (being hidden behind an experimental feature flag --enable-feature=agent). The beta release was more of a 2.32 beta to get people to try the Agent mode early, not so much an "agent beta" itself :)

Cheers,

Julius

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