Struct Telemetry 

pub struct Telemetry { /* private fields */ }

遥测上下文 — 持有配置和指标

Implementations

impl Telemetry

pub fn new(config: TelemetryConfig) -> Self

创建遥测实例

pub fn config(&self) -> &TelemetryConfig

获取配置引用

pub fn metrics(&self) -> TelemetryMetricsSnapshot

获取指标快照

pub fn query_span(&self, sql: &str) -> QuerySpanGuard

创建查询 span

返回一个 QuerySpanGuard，drop 时自动记录耗时和行数。

pub fn pool_acquire_span(&self) -> PoolAcquireSpanGuard

创建连接获取 span

pub async fn with_query_span<F, Fut, T>(&self, sql: &str, f: F) -> T

where F: FnOnce() -> Fut, Fut: Future<Output = T>,

用查询 span 包装异步查询闭包

let rows = telemetry.with_query_span("SELECT * FROM users", || async {
    conn.query(sql).await
}).await;

Trait Implementations

impl Clone for Telemetry

fn clone(&self) -> Telemetry

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Default for Telemetry

fn default() -> Self

Returns the “default value” for a type.