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feat: Enhance metrics endpoint to include synthetic monitor semaphore status for better scaling insights

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This commit is contained in:
Nawaz Dhandala
2026-03-01 13:24:50 +00:00
parent 667793bf0a
commit 7b6f3eeb3f
1 changed files with 15 additions and 1 deletions
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16
Probe/API/Metrics.ts
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@@ -15,6 +15,7 @@ import API from "Common/Utils/API";
import logger from "Common/Server/Utils/Logger";
import ProbeAPIRequest from "../Utils/ProbeAPIRequest";
import ProxyConfig from "../Utils/ProxyConfig";
import SyntheticMonitorSemaphore from "../Utils/SyntheticMonitorSemaphore";
const router: ExpressRouter = Express.getRouter();
@@ -83,7 +84,20 @@ router.get(
}
}
logger.debug(`Pending monitor count for KEDA: ${queueSize}`);
// Include synthetic monitor semaphore pressure: monitors queued
// waiting for a browser slot indicate the probe is at capacity and
// Kubernetes should scale up more probe replicas.
const semaphoreStatus: {
running: number;
queued: number;
maxSlots: number;
} = SyntheticMonitorSemaphore.getStatus();
queueSize += semaphoreStatus.queued;
logger.debug(
`Pending monitor count for KEDA: ${queueSize} (API pending: ${queueSize - semaphoreStatus.queued}, semaphore queued: ${semaphoreStatus.queued}, semaphore running: ${semaphoreStatus.running}/${semaphoreStatus.maxSlots})`,
);
return Response.sendJsonObjectResponse(req, res, {
queueSize: queueSize,