fix: fair-er scheduling for multitenant deploys (#22022)

frappe/utils/scheduler.py

@@ -10,6 +10,7 @@ Events:
 
 # imports - standard imports
 import os
+import random
 import time
 from typing import NoReturn
 
@@ -52,6 +53,9 @@ def enqueue_events_for_all_sites() -> None:
 	with frappe.init_site():
 		sites = get_sites()
 
+	# Sites are sorted in alphabetical order, shuffle to randomize priorities
+	random.shuffle(sites)
+
 	for site in sites:
 		try:
 			enqueue_events_for_site(site=site)