d97992e967
Vite's dev server can re-evaluate modules, causing prom-client "already registered" errors for all metrics, not just default ones. Use getOrCreate pattern to reuse existing metrics from the registry. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
44 lines
1.4 KiB
TypeScript
44 lines
1.4 KiB
TypeScript
import client from "prom-client";
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// Guard all metric registration — Vite's dev server can re-evaluate
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// this module, causing "already registered" errors.
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function getOrCreate<T>(name: string, create: () => T): T {
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return (client.register.getSingleMetric(name) as T) ?? create();
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}
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if (!client.register.getSingleMetric("process_cpu_user_seconds_total")) {
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client.collectDefaultMetrics();
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}
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export const httpRequestDuration = getOrCreate("http_request_duration_seconds", () =>
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new client.Histogram({
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name: "http_request_duration_seconds",
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help: "Duration of HTTP requests in seconds",
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labelNames: ["method", "route", "status"] as const,
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buckets: [0.01, 0.05, 0.1, 0.25, 0.5, 1, 2.5, 5],
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}),
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);
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export const plannerActiveSessions = getOrCreate("planner_active_sessions", () =>
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new client.Gauge({
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name: "planner_active_sessions",
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help: "Number of active planner sessions",
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}),
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);
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export const plannerConnectedClients = getOrCreate("planner_connected_clients", () =>
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new client.Gauge({
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name: "planner_connected_clients",
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help: "Number of connected WebSocket clients",
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}),
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);
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export const brouterRequestDuration = getOrCreate("brouter_request_duration_seconds", () =>
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new client.Histogram({
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name: "brouter_request_duration_seconds",
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help: "Duration of BRouter API requests in seconds",
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buckets: [0.1, 0.25, 0.5, 1, 2, 5, 10],
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}),
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);
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export const registry = client.register;
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