Enum DeliveryOutcome 

#[repr(usize)]
pub enum DeliveryOutcome {
    Accepted = 0,
    Timeout = 1,
    Unavailable = 2,
    RateLimited = 3,
    Rejected = 4,
    Authentication = 5,
    InvalidRequest = 6,
    Other = 7,
    Panic = 8,
    Shutdown = 9,
}

一次 envelope 投递的最终结果，不以尝试次数重复计数。

Variants

Accepted = 0

适配器确认下游受理，不证明最终收件。

Timeout = 1

投递超过期限，不能仅凭超时认定远端未受理。

Unavailable = 2

通知服务暂不可用。

RateLimited = 3

通知服务拒绝了超过限额的请求。

Rejected = 4

通知服务明确拒绝受理。

Authentication = 5

通知服务认证失败。

InvalidRequest = 6

请求不符合通知服务接口要求。

Other = 7

其它稳定分类之外的投递失败。

Panic = 8

投递或其析构因 panic 展开退出。

Shutdown = 9

投递在宿主停机收口时被取消。

Trait Implementations

impl Clone for DeliveryOutcome

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for DeliveryOutcome

impl Debug for DeliveryOutcome

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Eq for DeliveryOutcome

impl From<NotifyErrorKind> for DeliveryOutcome

fn from(kind: NotifyErrorKind) -> Self

业务作用：把渠道错误映射到统一投递指标。

参数说明：

• kind：是稳定渠道失败分类。

返回：不会携带原始错误的固定结果。

impl PartialEq for DeliveryOutcome

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for DeliveryOutcome