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DurationGuard

faucet_stream::observability

Struct DurationGuard 

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pub struct DurationGuard { /* private fields */ }
Expand description

On Drop, records the elapsed time since construction into the named histogram with the supplied labels. Recording on drop guarantees a sample even if the surrounding future is cancelled or panics.

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impl DurationGuard

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pub fn new(name: impl Into<KeyName>, labels: Vec<Label>) -> DurationGuard

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pub fn disarm(&mut self)

Disarm the guard so dropping it records nothing. Used when the timed span turns out not to represent real work — e.g. the terminal empty poll at the end of a source page stream, which would otherwise record a spurious ~0 sample into the page-duration histogram.

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pub fn with_connector( name: impl Into<KeyName>, pipeline: Cow<'static, str>, row: Cow<'static, str>, connector: Cow<'static, str>, ) -> DurationGuard

Build the canonical (name, pipeline, row, connector) label trio.

Trait Implementations§

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impl Drop for DurationGuard

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fn drop(&mut self)

Executes the destructor for this type. Read more
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fn pin_drop(self: Pin<&mut Self>)

🔬This is a nightly-only experimental API. (pin_ergonomics)
Execute the destructor for this type, but different to Drop::drop, it requires self to be pinned. Read more

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where Self: LowerExp,

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where Self: LowerHex,

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where Self: Octal,

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where Self: Pointer,

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where Self: UpperExp,

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where Self: UpperHex,

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