feat: Enhance e2e cron job configuration and add random sleep to FetchList job

HelmChart/Public/oneuptime/templates/e2e-cron.yml

@@ -13,10 +13,14 @@ metadata:
     date: "{{ now | unixEpoch }}"
 spec:
   schedule: "*/30 * * * *" # At every 30 minute.
+  {{- if $.Values.nodeSelector }}
+  nodeSelector: {{- $.Values.nodeSelector | toYaml | nindent 8 }}
+  {{- end }}
   jobTemplate:
     spec:
       template:
         spec:
+          
           containers:
           - name: e2e-cron
             image: {{ printf "%s/%s/%s:%s" $.Values.image.registry $.Values.image.repository "e2e" $.Values.image.tag }}

Probe/Jobs/Monitor/FetchList.ts

@@ -18,6 +18,8 @@ import logger from "Common/Server/Utils/Logger";
 import Monitor from "Common/Models/DatabaseModels/Monitor";
 import { EVERY_MINUTE } from "Common/Utils/CronTime";
 import BasicCron from "Common/Server/Utils/BasicCron";
+import NumberUtil from "Common/Utils/Number";
+import Sleep from "Common/Types/Sleep";
 
 const InitJob: VoidFunction = (): void => {
   BasicCron({
@@ -77,6 +79,14 @@ class FetchListAndProbe {
     try {
       logger.debug("Fetching monitor list");
 
+      // sleep randomly between 0 and 45 seconds
+
+      const sleepTime: number = NumberUtil.getRandomNumber(0, 45000);
+      logger.debug(
+        `Sleeping for ${sleepTime} ms, just to give probe API's soem time to load balance between different workers`,
+      );
+      await Sleep.sleep(sleepTime);
+
       const monitorListUrl: URL = URL.fromString(
         PROBE_INGEST_URL.toString(),
       ).addRoute("/monitor/list");