Enum MetricStream 

#[non_exhaustive]
pub enum MetricStream {
    Stdout,
    Stderr,
}

Which of the payload’s output streams a Metric was extracted from.

Captures WHERE the bytes came from (payload stdout vs stderr). This matters for diagnosing “surprise metrics” in post-run analysis: a metric tagged Self::Stderr signals a payload whose structured output landed on the diagnostic stream — well-behaved payloads keep stdout canonical per the OutputFormat doc contract, so a stderr tag is a review hint (“is this payload misconfigured, or did the fallback intentionally pick it up?”).

Populated by the extraction pipeline in crate::scenario::payload_run: the stdout-primary branch stamps Stdout, the stderr-fallback branch stamps Stderr. The streams are never merged; one or the other produces the metric set, and that identity propagates through Metric::stream.

Status: persisted on the sidecar for future review-tooling (CI dashboards, cargo ktstr stats-style filters); not yet consumed by perf-delta or any automated pipeline. The field is wired end-to-end from the payload-pipeline to the sidecar JSON today so that downstream review tools can start filtering on it without a schema change — but no production consumer reads it yet.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

Stdout

Extracted from the payload’s stdout (the happy path for fio / stress-ng / most benchmark tools).

Stderr

Extracted from the payload’s stderr via the stderr-fallback contract (for payloads that emit structured summaries to stderr — e.g. schbench’s show_latencies → fprintf(stderr, ...)).

Trait Implementations

impl Clone for MetricStream

fn clone(&self) -> MetricStream

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for MetricStream

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for MetricStream

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl PartialEq for MetricStream

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Serialize for MetricStream

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl Copy for MetricStream

impl Eq for MetricStream

impl StructuralPartialEq for MetricStream