> ## Documentation Index
> Fetch the complete documentation index at: https://docs.blnkfinance.com/llms.txt
> Use this file to discover all available pages before exploring further.
# Metrics
> Scrape Prometheus-compatible metrics from the Blnk server and worker processes.
export const CtaCallout = props => {
const {title, buttonLabel, href, trackingEvent, buttonTarget, rel = "noopener noreferrer", children} = props;
const handleCtaClick = () => {
if (typeof window === "undefined" || !trackingEvent) {
return;
}
try {
window.dispatchEvent(new CustomEvent("blnk:docs-cta", {
detail: {
name: trackingEvent,
href
}
}));
} catch {}
try {
window.posthog?.capture?.(trackingEvent, {
href
});
} catch {}
const gaPayload = {
cta_href: href
};
try {
window.gtag?.("event", trackingEvent, gaPayload);
} catch {}
try {
window.dataLayer = window.dataLayer || [];
window.dataLayer.push({
event: trackingEvent,
...gaPayload
});
} catch {}
};
const isExternal = typeof href === "string" && (/^https?:\/\//i).test(href);
const target = buttonTarget ?? (isExternal ? "_blank" : undefined);
const linkRel = isExternal ? rel : undefined;
return ;
};
Returns OpenTelemetry metrics in **Prometheus text format**. Requires [`enable_observability`](/advanced/configuration/observability) to be `true` on each process you scrape. See [Metrics reference](/advanced/metrics-reference) for metric names, types, and attributes.
Blnk runs the **server** and **worker** as separate processes. Each registers its own `GET /metrics` endpoint on a different port. The path is the same, but the series differ - scrape **both** targets in Prometheus to capture API and async processing signals.
| Endpoint | Process | Port setting | Default URL |
| :------------- | :------ | :---------------------- | :------------------------------ |
| `GET /metrics` | Server | `server.port` | `http://localhost:5001/metrics` |
| `GET /metrics` | Worker | `queue.monitoring_port` | `http://localhost:5004/metrics` |
See [Health check](/reference/get-health) for the same server/worker split on `GET /health`.
When observability is disabled, or the process was not restarted after enabling it, `GET /metrics` returns `404`.
### Authentication
`/metrics` uses `Authorization: Bearer `, not `X-Blnk-Key`. When `metrics_bearer_token` is set, or [secure mode](/advanced/configuration/server-security#secure-mode) is on without a token configured, bearer authentication applies. See [Metrics endpoint](/advanced/configuration/server-security#metrics-endpoint).
Bearer token when required. Format: `Bearer `.
```bash Server theme={"system"}
curl -X GET "http://localhost:5001/metrics" \
-H "Authorization: Bearer "
```
```bash Worker theme={"system"}
curl -X GET "http://localhost:5004/metrics" \
-H "Authorization: Bearer "
```
```text 200 OK theme={"system"}
# HELP blnk_transaction_total Total transactions by final status and currency
# TYPE blnk_transaction_total counter
blnk_transaction_total{currency="USD",status="APPLIED"} 128
```
When authentication fails, responses use structured JSON errors. See [API error codes](/advanced/error-codes) for `AUTH_METRICS_TOKEN_REQUIRED`, `AUTH_INVALID_BEARER_TOKEN`, and `AUTH_METRICS_DISABLED`.
```json 401 Unauthorized wrap theme={"system"}
{
"error": "metrics bearer token required",
"error_detail": {
"code": "AUTH_METRICS_TOKEN_REQUIRED",
"message": "metrics bearer token required",
"details": {}
}
}
```
## Need help?
We are very happy to help you make the most of Blnk, regardless of whether it is your first time or you are switching from another tool.
To ask questions or discuss issues, please [contact us](mailto:support@blnkfinance.com) or [join our Discord community](https://discord.gg/7WNv94zPpx).
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