send a p1 when a broadcast goes out on production

it's important to keep tabs on when these things leave our system.
Sending a zendesk ticket that triggers a P1 is probably our simplest way
of notifying the team when this happens (it's what we do with out of
hours emergencies on the admin app too). We don't have any direct
pagerduty integrations from the api app, but we already have the zendesk
client hooked up.

After broadcasts go live, we may want to change this to a P2 (but even
then, there's arguments for keeping it P1 to start with I think).

Don't cause a P1 if it goes out on staging as that might be MNOs testing.

app/celery/broadcast_message_tasks.py

@@ -5,7 +5,7 @@ from flask import current_app
 from notifications_utils.statsd_decorators import statsd
 from sqlalchemy.schema import Sequence
 
-from app import cbc_proxy_client, db, notify_celery
+from app import cbc_proxy_client, db, notify_celery, zendesk_client
 from app.clients.cbc_proxy import (
     CBCProxyFatalException,
     CBCProxyRetryableException,
@@ -111,6 +111,30 @@ def send_broadcast_event(broadcast_event_id):
         return
 
     broadcast_event = dao_get_broadcast_event_by_id(broadcast_event_id)
+
+    if current_app.config['NOTIFY_ENVIRONMENT'] == 'production':
+        broadcast_message = broadcast_event.broadcast_message
+        # raise a P1 to alert team that broadcast is going out.
+        message = '\n'.join([
+            'Broadcast Sent',
+            '',
+            f'https://www.notifications.service.gov.uk/services/{broadcast_message.service_id}/current-alerts/{broadcast_message.id}',  # noqa
+            '',
+            f'This broacast has been sent on channel {broadcast_message.service.broadcast_channel}.',
+            f'This broadcast is targeted at areas {broadcast_message.areas.get("areas")}.',
+            ''
+            f'This broadcast\'s content starts "{broadcast_message.content[:100]}"'
+            '',
+            'If this alert is not expected refer to the runbook for instructions.',
+            'https://docs.google.com/document/d/1J99yOlfp4nQz6et0w5oJVqi-KywtIXkxrEIyq_g2XUs',
+        ])
+        zendesk_client.create_ticket(
+            subject="Live broadcast sent",
+            message=message,
+            ticket_type=zendesk_client.TYPE_INCIDENT,
+            p1=True,
+        )
+
     for provider in broadcast_event.service.get_available_broadcast_providers():
         send_broadcast_provider_message.apply_async(
             kwargs={'broadcast_event_id': broadcast_event_id, 'provider': provider},