Enum aws_sdk_lightsail::types::MetricName
source · #[non_exhaustive]pub enum MetricName {
Show 26 variants
BurstCapacityPercentage,
BurstCapacityTime,
CpuUtilization,
ClientTlsNegotiationErrorCount,
DatabaseConnections,
DiskQueueDepth,
FreeStorageSpace,
HttpCodeInstance2XxCount,
HttpCodeInstance3XxCount,
HttpCodeInstance4XxCount,
HttpCodeInstance5XxCount,
HttpCodeLb4XxCount,
HttpCodeLb5XxCount,
HealthyHostCount,
InstanceResponseTime,
NetworkIn,
NetworkOut,
NetworkReceiveThroughput,
NetworkTransmitThroughput,
RejectedConnectionCount,
RequestCount,
StatusCheckFailed,
StatusCheckFailedInstance,
StatusCheckFailedSystem,
UnhealthyHostCount,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against MetricName
, it is important to ensure
your code is forward-compatible. That is, if a match arm handles a case for a
feature that is supported by the service but has not been represented as an enum
variant in a current version of SDK, your code should continue to work when you
upgrade SDK to a future version in which the enum does include a variant for that
feature.
Here is an example of how you can make a match expression forward-compatible:
# let metricname = unimplemented!();
match metricname {
MetricName::BurstCapacityPercentage => { /* ... */ },
MetricName::BurstCapacityTime => { /* ... */ },
MetricName::CpuUtilization => { /* ... */ },
MetricName::ClientTlsNegotiationErrorCount => { /* ... */ },
MetricName::DatabaseConnections => { /* ... */ },
MetricName::DiskQueueDepth => { /* ... */ },
MetricName::FreeStorageSpace => { /* ... */ },
MetricName::HttpCodeInstance2XxCount => { /* ... */ },
MetricName::HttpCodeInstance3XxCount => { /* ... */ },
MetricName::HttpCodeInstance4XxCount => { /* ... */ },
MetricName::HttpCodeInstance5XxCount => { /* ... */ },
MetricName::HttpCodeLb4XxCount => { /* ... */ },
MetricName::HttpCodeLb5XxCount => { /* ... */ },
MetricName::HealthyHostCount => { /* ... */ },
MetricName::InstanceResponseTime => { /* ... */ },
MetricName::NetworkIn => { /* ... */ },
MetricName::NetworkOut => { /* ... */ },
MetricName::NetworkReceiveThroughput => { /* ... */ },
MetricName::NetworkTransmitThroughput => { /* ... */ },
MetricName::RejectedConnectionCount => { /* ... */ },
MetricName::RequestCount => { /* ... */ },
MetricName::StatusCheckFailed => { /* ... */ },
MetricName::StatusCheckFailedInstance => { /* ... */ },
MetricName::StatusCheckFailedSystem => { /* ... */ },
MetricName::UnhealthyHostCount => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when metricname
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant MetricName::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
MetricName::Unknown(UnknownVariantValue("NewFeature".to_owned()))
and calling as_str
on it yields "NewFeature"
.
This match expression is forward-compatible when executed with a newer
version of SDK where the variant MetricName::NewFeature
is defined.
Specifically, when metricname
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on MetricName::NewFeature
also yielding "NewFeature"
.
Explicitly matching on the Unknown
variant should
be avoided for two reasons:
- The inner data
UnknownVariantValue
is opaque, and no further information can be extracted. - It might inadvertently shadow other intended match arms.
Variants (Non-exhaustive)§
This enum is marked as non-exhaustive
BurstCapacityPercentage
BurstCapacityTime
CpuUtilization
ClientTlsNegotiationErrorCount
DatabaseConnections
DiskQueueDepth
FreeStorageSpace
HttpCodeInstance2XxCount
HttpCodeInstance3XxCount
HttpCodeInstance4XxCount
HttpCodeInstance5XxCount
HttpCodeLb4XxCount
HttpCodeLb5XxCount
HealthyHostCount
InstanceResponseTime
NetworkIn
NetworkOut
NetworkReceiveThroughput
NetworkTransmitThroughput
RejectedConnectionCount
RequestCount
StatusCheckFailed
StatusCheckFailedInstance
StatusCheckFailedSystem
UnhealthyHostCount
Unknown(UnknownVariantValue)
Unknown
. See the docs on this enum for the correct way to handle unknown variants.Unknown
contains new variants that have been added since this code was generated.
Implementations§
source§impl MetricName
impl MetricName
source§impl MetricName
impl MetricName
sourcepub fn try_parse(value: &str) -> Result<Self, UnknownVariantError>
pub fn try_parse(value: &str) -> Result<Self, UnknownVariantError>
Parses the enum value while disallowing unknown variants.
Unknown variants will result in an error.
Trait Implementations§
source§impl AsRef<str> for MetricName
impl AsRef<str> for MetricName
source§impl Clone for MetricName
impl Clone for MetricName
source§fn clone(&self) -> MetricName
fn clone(&self) -> MetricName
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Debug for MetricName
impl Debug for MetricName
source§impl Display for MetricName
impl Display for MetricName
source§impl From<&str> for MetricName
impl From<&str> for MetricName
source§impl FromStr for MetricName
impl FromStr for MetricName
source§impl Hash for MetricName
impl Hash for MetricName
source§impl Ord for MetricName
impl Ord for MetricName
source§fn cmp(&self, other: &MetricName) -> Ordering
fn cmp(&self, other: &MetricName) -> Ordering
1.21.0 · source§fn max(self, other: Self) -> Selfwhere
Self: Sized,
fn max(self, other: Self) -> Selfwhere
Self: Sized,
source§impl PartialEq for MetricName
impl PartialEq for MetricName
source§fn eq(&self, other: &MetricName) -> bool
fn eq(&self, other: &MetricName) -> bool
self
and other
values to be equal, and is used
by ==
.source§impl PartialOrd for MetricName
impl PartialOrd for MetricName
source§fn partial_cmp(&self, other: &MetricName) -> Option<Ordering>
fn partial_cmp(&self, other: &MetricName) -> Option<Ordering>
1.0.0 · source§fn le(&self, other: &Rhs) -> bool
fn le(&self, other: &Rhs) -> bool
self
and other
) and is used by the <=
operator. Read moreimpl Eq for MetricName
impl StructuralPartialEq for MetricName
Auto Trait Implementations§
impl Freeze for MetricName
impl RefUnwindSafe for MetricName
impl Send for MetricName
impl Sync for MetricName
impl Unpin for MetricName
impl UnwindSafe for MetricName
Blanket Implementations§
source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
source§fn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
source§impl<Q, K> Comparable<K> for Q
impl<Q, K> Comparable<K> for Q
source§impl<Q, K> Equivalent<K> for Q
impl<Q, K> Equivalent<K> for Q
source§impl<Q, K> Equivalent<K> for Q
impl<Q, K> Equivalent<K> for Q
source§fn equivalent(&self, key: &K) -> bool
fn equivalent(&self, key: &K) -> bool
key
and return true
if they are equal.source§impl<T> Instrument for T
impl<T> Instrument for T
source§fn instrument(self, span: Span) -> Instrumented<Self>
fn instrument(self, span: Span) -> Instrumented<Self>
source§fn in_current_span(self) -> Instrumented<Self>
fn in_current_span(self) -> Instrumented<Self>
source§impl<T> IntoEither for T
impl<T> IntoEither for T
source§fn into_either(self, into_left: bool) -> Either<Self, Self>
fn into_either(self, into_left: bool) -> Either<Self, Self>
self
into a Left
variant of Either<Self, Self>
if into_left
is true
.
Converts self
into a Right
variant of Either<Self, Self>
otherwise. Read moresource§fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
self
into a Left
variant of Either<Self, Self>
if into_left(&self)
returns true
.
Converts self
into a Right
variant of Either<Self, Self>
otherwise. Read more