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Add HandlerOpts.AcceptedFormats to allow callers to customize the formats negotiated based on the incoming Accept header. This enables opting into experimental formats such as OpenMetrics 2.0 without altering the default negotiation behavior when EnableOpenMetrics is set. Add table-driven tests for OpenMetrics 2.0 negotiation and exposition. Signed-off-by: bwplotka <bwplotka@gmail.com>
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Allows customizing the formats negotiated by
promhttp.HandlerviaHandlerOpts.AcceptedFormats.When
AcceptedFormatsis empty:EnableOpenMetricsis false,expfmt.DefaultAcceptedFormats()is used.EnableOpenMetricsis true,expfmt.DefaultOpenMetricsAcceptedFormats()is used.Callers can now specify custom formats in
AcceptedFormats, allowing opt-in to experimental formats like OpenMetrics 2.0 (expfmt.FmtOpenMetrics_2_0_0) without altering the default negotiation behavior whenEnableOpenMetricsis set.Supersedes #2132.