fix(matchers/compat): use legacy name validation scheme in classic mode #4426
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Signed-off-by: Julius Hinze <julius.hinze@grafana.com>
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When importing alertmanager in a project with
prometheus/common>= v0.62.0 in classic mode, calls tocompat.IsValidLabelNameuseUTF8Validationscheme due to a new default for NameValidationScheme. This PR addresses this change by correctly using the legacy validation logic.As a workaround, set
model.NameValidationSchemetomodel.LegacyValidation.