[puppet] Change digest email send time by 1 hour for daylight savings.

(imported from commit 8ac1747f15e10b850f73ce28ea4579bee62ba1a4)

bots/check-rabbitmq-queue

@@ -50,7 +50,7 @@ now_struct = time.gmtime(now)
 # While we are sending digest emails, at 11am each weekday, the mail queues can
 # get backed up; don't alert on those.
 if not set(warn_queues) - set(("missedmessage_emails", "digest_emails")) and \
-        now_struct.tm_hour == 16 and now_struct.tm_min < 25:
+        now_struct.tm_hour == 15 and now_struct.tm_min < 25:
     status = 0
     print("%s|%s|%s|processing digests, not alerting on elevated mail queues" % (
             now, status, states[status]))

puppet/zulip_internal/files/cron.d/send-digest-emails

@@ -1,4 +1,4 @@
 MAILTO=root
 
 # Send digest emails once a day. Time is in UTC.
-0 16 * * *   zulip cd /home/zulip/deployments/current && python manage.py enqueue_digest_emails
+0 15 * * *   zulip cd /home/zulip/deployments/current && python manage.py enqueue_digest_emails