create_user: Send a group DM to admins for low licenses warning.

Earlier, low licenses warning message was sent to the
"New user announcements" stream.

We plan to disable the stream by default as a part of improving
onboarding experience.

Now, we send a group DM to admins for low licenses warning
to make it independent of the setting. These warning messages
are important and shouldn't be missed.

zerver/actions/create_user.py

@@ -11,7 +11,11 @@ from django.utils.translation import override as override_language
 from analytics.lib.counts import COUNT_STATS, do_increment_logging_stat
 from confirmation import settings as confirmation_settings
 from zerver.actions.invites import notify_invites_changed
-from zerver.actions.message_send import internal_send_private_message, internal_send_stream_message
+from zerver.actions.message_send import (
+    internal_send_huddle_message,
+    internal_send_private_message,
+    internal_send_stream_message,
+)
 from zerver.actions.streams import bulk_add_subscriptions, send_peer_subscriber_events
 from zerver.actions.user_groups import do_send_user_group_members_update_event
 from zerver.actions.users import change_user_is_active, get_service_dicts_for_bot
@@ -81,6 +85,16 @@ def send_message_to_signup_notification_stream(
     internal_send_stream_message(sender, signup_announcements_stream, topic_name, message)
 
 
+def send_group_direct_message_to_admins(sender: UserProfile, realm: Realm, content: str) -> None:
+    administrators = list(realm.get_human_admin_users())
+    internal_send_huddle_message(
+        realm,
+        sender,
+        content,
+        recipient_users=administrators,
+    )
+
+
 def notify_new_user(user_profile: UserProfile) -> None:
     user_count = realm_user_count(user_profile.realm)
     sender_email = settings.NOTIFICATION_BOT
@@ -92,6 +106,7 @@ def notify_new_user(user_profile: UserProfile) -> None:
             message = _("{user} joined this organization.").format(
                 user=silent_mention_syntax_for_user(user_profile), user_count=user_count
             )
+            send_message_to_signup_notification_stream(sender, user_profile.realm, message)
 
         if settings.BILLING_ENABLED:
             from corporate.lib.registration import generate_licenses_low_warning_message_if_required
@@ -102,8 +117,7 @@ def notify_new_user(user_profile: UserProfile) -> None:
             if licenses_low_warning_message is not None:
                 message += "\n"
                 message += licenses_low_warning_message
-
-        send_message_to_signup_notification_stream(sender, user_profile.realm, message)
+                send_group_direct_message_to_admins(sender, user_profile.realm, message)
 
 
 def set_up_streams_for_new_human_user(

zerver/tests/test_new_users.py

@@ -16,6 +16,8 @@ from zerver.lib.test_classes import ZulipTestCase
 from zerver.lib.timezone import canonicalize_timezone
 from zerver.models import Message, Realm, Recipient, Stream, UserProfile
 from zerver.models.realms import get_realm
+from zerver.models.recipients import get_huddle_user_ids
+from zerver.models.users import get_system_bot
 from zerver.signals import JUST_CREATED_THRESHOLD, get_device_browser, get_device_os
 
 
@@ -294,10 +296,14 @@ class TestNotifyNewUser(ZulipTestCase):
 
     def test_notify_realm_of_new_user_in_manual_license_management(self) -> None:
         realm = get_realm("zulip")
+        admin_user_ids = set(realm.get_human_admin_users().values_list("id", flat=True))
+        notification_bot = get_system_bot(settings.NOTIFICATION_BOT, realm.id)
+        expected_group_direct_message_user_ids = admin_user_ids | {notification_bot.id}
 
         user_count = get_latest_seat_count(realm)
+        extra_licenses = 5
         self.subscribe_realm_to_monthly_plan_on_manual_license_management(
-            realm, user_count + 5, user_count + 5
+            realm, user_count + extra_licenses, user_count + extra_licenses
         )
 
         user_no = 0
@@ -316,8 +322,24 @@ class TestNotifyNewUser(ZulipTestCase):
             notify_new_user(new_user)
 
             message = self.get_last_message()
+            if extra_licenses - user_no > 3:
+                # More than 3 licenses remaining. No group DM.
                 actual_stream = Stream.objects.get(id=message.recipient.type_id)
                 self.assertEqual(actual_stream, realm.signup_announcements_stream)
+            else:
+                # Stream message
+                second_to_last_message = self.get_second_to_last_message()
+                actual_stream = Stream.objects.get(id=second_to_last_message.recipient.type_id)
+                self.assertEqual(actual_stream, realm.signup_announcements_stream)
+                self.assertIn(
+                    f"@_**new user {user_no}|{new_user.id}** joined this organization.",
+                    second_to_last_message.content,
+                )
+                # Group DM
+                self.assertEqual(
+                    set(get_huddle_user_ids(message.recipient)),
+                    expected_group_direct_message_user_ids,
+                )
             self.assertIn(
                 f"@_**new user {user_no}|{new_user.id}** joined this organization.",
                 message.content,