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The OM2 writer selection previously activated when any feature flag was set, but there was no way to just enable OM2 without opting into a specific feature. This adds an explicit `enabled` gate (io.prometheus.openmetrics2.enabled) as the single control for OM2 writer selection. Feature flags alone no longer activate OM2. The programmatic `enableOpenMetrics2()` configurator sets enabled=true implicitly, matching its name. Signed-off-by: Gregor Zeitlinger <gregor.zeitlinger@grafana.com>
This was referenced Mar 17, 2026
jaydeluca
approved these changes
Mar 17, 2026
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Summary
io.prometheus.openmetrics2.enabledas the explicit gate for OM2writer selection. Feature flags alone no longer activate OM2.
enableOpenMetrics2()programmatic configurator setsenabled=trueimplicitly.
name-preservation behavior without committing to other OM2 features.
Test plan
OpenMetrics2PropertiesTestcoversenabledin load, builder,enableAll, defaultValues
ExpositionFormatsTestverifies OM2 activation requiresenabled=true, feature flags alone fall back to OM1