text: # Webhooks for external integrations.
  from typing import Any, Dict, List
  
  from django.http import HttpRequest, HttpResponse
  
  from zerver.decorator import api_key_only_webhook_view
  from zerver.lib.request import REQ, has_request_variables
  from zerver.lib.response import json_success
  from zerver.lib.webhooks.common import check_send_webhook_message
  from zerver.models import UserProfile
  
  @api_key_only_webhook_view('AlertManager')
  @has_request_variables
  def api_alertmanager_webhook(request: HttpRequest, user_profile: UserProfile,
                               payload: Dict[str, Any] = REQ(argument_type='body')) -> HttpResponse:
      name_field = request.GET.get("name", "instance")
      desc_field = request.GET.get("desc", "alertname")
      topics: Dict[str, Dict[str, List[str]]] = {}
  
      for alert in payload["alerts"]:
          labels = alert.get("labels", {})
          annotations = alert.get("annotations", {})
  
          name = labels.get(
              name_field, annotations.get(name_field, "(unknown)"))
          desc = labels.get(
              desc_field, annotations.get(desc_field, "<missing field: {}>".format(desc_field)))
  
          url = alert.get("generatorURL").replace("tab=1", "tab=0")
  
          body = "{description} ([graph]({url}))".format(description=desc, url=url)
          if name not in topics:
              topics[name] = {"firing": [], "resolved": []}
          topics[name][alert["status"]].append(body)
  
      for topic, statuses in topics.items():
          for status, messages in statuses.items():
              if len(messages) == 0:
                  continue
  
              if status == "firing":
                  icon = ":alert:"
                  title = "FIRING"
              else:
                  title = "Resolved"
                  icon = ":squared_ok:"
  
              if len(messages) == 1:
                  body = "{icon} **{title}** {message}".format(
                      icon=icon,
                      title=title,
                      message=messages[0])
              else:
                  message_list = "\n".join(["* {}".format(m) for m in messages])
                  body = "{icon} **{title}**\n{messages}".format(
                      icon=icon,
                      title=title,
                      messages=message_list)
  
              check_send_webhook_message(request, user_profile, topic, body)
  
      return json_success()
  