arbit 0.7.0

Security proxy for MCP (Model Context Protocol) — auth, rate limiting, payload filtering, and audit logging between AI agents and MCP servers
Documentation 
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use prometheus::{CounterVec, Encoder, Opts, Registry, TextEncoder};

pub struct GatewayMetrics {
    registry: Registry,
    requests: CounterVec,
}

impl GatewayMetrics {
    pub fn new() -> anyhow::Result<Self> {
        let registry = Registry::new();

        let requests = CounterVec::new(
            Opts::new("arbit_requests_total", "Total requests processed by arbit"),
            &["agent", "outcome"],
        )?;
        registry.register(Box::new(requests.clone()))?;

        Ok(Self { registry, requests })
    }

    pub fn record(&self, agent: &str, outcome: &str) {
        self.requests.with_label_values(&[agent, outcome]).inc();
    }

    /// Render all metrics in Prometheus text exposition format.
    pub fn render(&self) -> String {
        let encoder = TextEncoder::new();
        let families = self.registry.gather();
        let mut buf = Vec::new();
        let _ = encoder.encode(&families, &mut buf);
        String::from_utf8(buf).unwrap_or_default()
    }
}