Add "fake" ticket page that DummyPlugin links to when autocreating tickets

[stveit]

Scope and purpose

Fixes #1194.

Adds a page with information from an incident that kinda simulates what a real ticket could look like on a ticket site (very basic page). DummyPlugin will return a URL to this page when you use the "Create ticket" function.

Example of the basic page (uses a ticket html file that already existed):

The url has the format /incidents/fake_ticket/<pk>/. I'll happily take suggestions for URL names and such, or potentially other ways to generate a page like this. I kinda just went with the "fake" naming scheme, but maybe it should be called something else. Maybe /incidents/dummy_ticket/<pk>/ instead?

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• Added a changelog fragment for towncrier
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• If this results in changes in the UI: Added screenshots of the before and after
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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 70.58824% with 5 lines in your changes missing coverage. Please review.

Project coverage is 78.93%. Comparing base (4fc7811) to head (c83949f).

Files with missing lines	Patch %	Lines
src/argus/htmx/incident/views.py	54.54%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1488      +/-   ##
==========================================
- Coverage   78.97%   78.93%   -0.04%     
==========================================
  Files         120      120              
  Lines        5294     5308      +14     
==========================================
+ Hits         4181     4190       +9     
- Misses       1113     1118       +5     

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[johannaengland]

"Demo ticket" might be another option for showing that it is not a real ticket

[johannaengland]

I would also like to see an additional test along the lines that the dummy plugin returns a valid url and that the result of following that url is a site containing some details of the incident

[johannaengland]

Suggested change

	from django.utils.timezone import now as tznow
	from django.urls import reverse
	from django.urls import reverse
	from django.utils.timezone import now as tznow

[johannaengland]

Suggested change

	from argus.incident.ticket.utils import get_ticket_plugin_path
	from argus.incident.ticket.base import TicketPluginException
	from argus.incident.serializers import IncidentSerializer
	from argus.incident.serializers import IncidentSerializer
	from argus.incident.ticket.utils import get_ticket_plugin_path
	from argus.incident.ticket.base import TicketPluginException

[johannaengland]

I think you could use

Argus/src/argus/incident/ticket/utils.py

Lines 64 to 72 in 4fc7811

	def serialize_incident_for_ticket_autocreation(incident: Incident, actor: User):
	serialized_incident = IncidentSerializer(incident).data
	# TODO: ensure argus_url ends with "/" on HTMx frontend
	serialized_incident["argus_url"] = urljoin(
	getattr(settings, "FRONTEND_URL", ""),
	f"incidents/{incident.pk}",
	)
	serialized_incident["user"] = actor.get_full_name()
	return serialized_incident

for this

[johannaengland]

You could move this into the create function, just to keep the concern of "creating a ticket" separate for demonstration purposes on how to write a ticket plugin

[johannaengland]

This returns the link to the incident detail page, not the fake ticket system page

Suggested change

	url = urljoin(
	getattr(settings, "FRONTEND_URL", ""),
	reverse("htmx:incident-detail", kwargs={"pk": serialized_incident["pk"]}),
	)
	url = reverse("htmx:fake-ticket", kwargs={"pk": serialized_incident["pk"]})

[hmpf]

I will hand-check this when I can, no merging or approves before that.