Struct FetchMetadata 

pub struct FetchMetadata {
    pub refreshed_at: SystemTime,
    pub cache_hits: Vec<String>,
    pub cache_misses: Vec<String>,
    pub per_source: HashMap<String, HashMap<String, Value>>,
}

Per-fetch telemetry. per_source stays empty in phase 2 (no provider dispatch yet); phase 3 populates it from FetchResult.metadata per declared source.

Fields

refreshed_at: SystemTime

cache_hits: Vec<String>

Source names served from cache. Empty in phase 2 (no resolver yet).

cache_misses: Vec<String>

Source names that produced a fresh fetch. Empty in phase 2 (no resolver yet).

per_source: HashMap<String, HashMap<String, Value>>

Per-source provider metadata (e.g. bytes_billed, rows_returned). Empty in phase 2 — populated once providers exist.

Implementations

impl FetchMetadata

pub fn empty_now() -> Self

Construct empty metadata stamped at the current wall clock. Used by phase 2’s fetch (which only reads from pre-registered sources).

Trait Implementations

impl Clone for FetchMetadata

fn clone(&self) -> FetchMetadata

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for FetchMetadata

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

Formats the value using the given formatter.