Struct Metrics 

pub struct Metrics { /* private fields */ }

Process-wide metric registry. All methods take &self and use relaxed atomics — metrics are monotonic counters/observations where exact inter-thread ordering doesn’t matter.

Implementations

impl Metrics

pub fn new() -> Self

pub fn record_request(&self, outcome: &str)

Count one finished request under its outcome label.

pub fn observe_latency(&self, elapsed: Duration)

Observe a request’s end-to-end latency into the histogram.

pub fn record_ratelimit_hit(&self, scope: &str)

Count a rate-limit rejection by which limiter scope tripped (ip/route/key).

pub fn record_waf_hit(&self, class: &str)

Count one WAF rule match by rule class (sqli/xss/path_traversal/custom). Recorded for both report-only and blocking modes — so a report-first rollout is visible — while a blocked request is additionally counted under the forbidden request outcome.

pub fn record_csp_report(&self)

Count one received CSP violation report.

pub fn add_usage_request(&self)

Count one request toward the drainable usage accumulator (managed mode). Called once per request from the single finish exit, so every request — proxied or rejected — counts.

pub fn add_usage_bytes(&self, ingress: usize, egress: usize)

Add request (ingress) + response (egress) bytes to the drainable usage accumulator. Called on the proxied path where both bodies are buffered and the counts are known.

pub fn drain_usage(&self) -> (u64, u64, u64)

Atomically read-and-zero the usage accumulators, returning (requests, ingress, egress) accrued since the last drain — the delta the usage reporter ships to the control plane.

pub fn restore_usage(&self, requests: u64, ingress: u64, egress: u64)

Add a previously-drained delta back, e.g. when a usage report failed to send — so the next period reships it instead of losing billable usage. (New requests that arrived during the failed send simply add on top, as intended.)

pub fn render(&self) -> String

Render the Prometheus text exposition (format version 0.0.4).

Trait Implementations

impl Default for Metrics

fn default() -> Self

Returns the “default value” for a type.