From e947d21060212f4c98341f583830e33caceca007 Mon Sep 17 00:00:00 2001
From: Simon Larsen <simonlarsen@oneuptime.com>
Date: Wed, 4 Dec 2024 15:57:02 +0000
Subject: [PATCH] Add random sleep interval to FetchList worker to reduce
 server load

---
 Probe/Jobs/Monitor/FetchList.ts | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/Probe/Jobs/Monitor/FetchList.ts b/Probe/Jobs/Monitor/FetchList.ts
index 57aba37689..3ffebbb53c 100644
--- a/Probe/Jobs/Monitor/FetchList.ts
+++ b/Probe/Jobs/Monitor/FetchList.ts
@@ -28,6 +28,14 @@ export default class FetchListAndProbe {
     // eslint-disable-next-line no-constant-condition
     while (true) {
       try {
+        // Sleep randomly between 1 and 5 seconds.
+        // We do this to avoid all workers hitting the server at the same time and fetching the same monitors.
+        const sleepTime: number = Math.floor(Math.random() * 5000) + 1000;
+        logger.debug(
+          `Worker ${this.workerName} is sleeping for ${sleepTime} seconds`,
+        );
+        await Sleep.sleep(Math.round(sleepTime) % 5000);
+
         const runTime: Date = OneUptimeDate.getCurrentDate();
 
         logger.debug(`Probing monitors ${this.workerName}`);