[feat] Adds Django Version as a Metric

[ethanthopkins]

• Adds new module (info) for static metrics such as Django Version. New module was justified as to not mix concerns with existing modules that represent dynamic variables.
• Django version includes Major, Minor, and Patch in addition to the full version number.
• Adds unit test for the metric added.
• Imports module at Init.

All unit tests pass and Django Version displays on test Django Project.

Closes #503

[Copilot]

Pull request overview

This PR adds a new Prometheus Info metric to expose the running Django version (django_info{...} 1.0), aligning with the feature request in #503 and similar ecosystem “*_info” metrics.

Changes:

• Adds django_info (prometheus_client.Info) populated with Django version labels (major/minor/patchlevel/version).
• Adds a unit test for the new metric.
• Imports the new info module from django_prometheus.__init__ so the metric is registered on package import.

Show a summary per file

File	Description
django_prometheus/info.py	Introduces the django_info static Info metric and sets its label values at import time.
django_prometheus/tests/test_info.py	Adds a test validating the django_info metric.
django_prometheus/__init__.py	Ensures the new metrics module is imported/registered when importing django_prometheus.

Copilot's findings

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• Files reviewed: 3/3 changed files
• Comments generated: 3

[mgstabrani]

Asserting on private attributes (_name, _value, …) is brittle. Testing through the public registry would be better. It verifies the metric is actually exported and stays namespace-safe:

Suggested change

	from django import VERSION, get_version
	from django_prometheus.info import django_info
	def test_info_metric():
	major, minor, patch = VERSION[:3]
	assert django_info._name == "django"
	assert django_info._documentation == "Django version information"
	assert django_info._value == {"major": str(major),
	"minor": str(minor),
	"patchlevel": str(patch),
	"version": get_version(),
	}
	from django import VERSION, get_version
	from prometheus_client import REGISTRY
	from django_prometheus.conf import NAMESPACE
	def test_info_metric():
	major, minor, patch = VERSION[:3]
	name = f"{NAMESPACE}_django_info" if NAMESPACE else "django_info"
	labels = {
	"major": str(major),
	"minor": str(minor),
	"patchlevel": str(patch),
	"version": get_version(),
	}
	assert REGISTRY.get_sample_value(name, labels) == 1.0