in internal/provider/map_validator.go [26:34]
func (m mapValidator) ValidateMap(ctx context.Context, request validator.MapRequest, response *validator.MapResponse) {
reservedKeys := []string{"event"}
for k := range request.ConfigValue.Elements() {
if slices.Contains(reservedKeys, k) {
errStr := fmt.Sprintf("`tags` must not contains keys %v.", reservedKeys)
response.Diagnostics.AddError(errStr, "")
}
}
}