feat: migrate to mitol-django-observability plugin

[blarghmatey]

Summary

Migrate to mitol-django-observability — the new shared plugin that consolidates OpenTelemetry tracing and structured logging configuration.

Changes

• Remove main/telemetry.py — configure_opentelemetry() is now called automatically by the plugin
• Remove LOGGING dict from settings.py — provided by the plugin via mitol.observability.settings.logging
• Add mitol.observability.apps.ObservabilityConfig to INSTALLED_APPS
• Update pyproject.toml: add mitol-django-observability dep, remove direct opentelemetry-api/sdk/exporter deps

Before / After

Before: ~120 lines of boilerplate OTel + logging setup across telemetry.py, apps.py, and settings.py
After: One entry in INSTALLED_APPS + one import

Depends on

Requires mitol-django-observability to be published to PyPI (see ol-django#407).

[github-actions]

OpenAPI Changes

Show/hide No detectable change.

Unexpected changes? Ensure your branch is up-to-date with main (consider rebasing).

[mbertrand]

I tried modifying pyproject.toml to point to the ol-django commit for that PR, to see if that would fix the failing tests:

"mitol-django-observability @ git+ssh://git@github.com/mitodl/ol-django.git@a0493006d1cdf8553ff02556e9bf8af346743f55#subdirectory=src/observability",

But ended up getting a bunch of errors on uv sync, looks like additional libraries need to be updated:

× No solution found when resolving dependencies:
╰─▶ Because mitol-django-common==2025.12.23.2 depends on django-redis>=6.0,<7.dev0 and only mitol-django-common==2025.12.23.2 is available, we can conclude
that all versions of mitol-django-common depend on django-redis>=6.0,<7.dev0.
And because mitol-django-observability==2026.1.0 depends on mitol-django-common and only mitol-django-observability==2026.1.0 is available, we can
conclude that all versions of mitol-django-observability depend on django-redis>=6.0,<7.dev0.
And because your project depends on django-redis>=5.2.0,<6 and mitol-django-observability, we can conclude that your project's requirements are
unsatisfiable.

[Copilot]

Pull request overview

Migrates the Django project’s tracing/logging setup to the shared mitol-django-observability plugin, removing local OpenTelemetry/bootstrap code and deferring configuration to the plugin.

Changes:

• Add mitol-django-observability as a dependency and update the lockfile accordingly.
• Remove the project’s bespoke OpenTelemetry initializer (main/telemetry.py) and its invocation from main/apps.py.
• Switch Django logging configuration to use mitol.observability.settings.logging.LOGGING and register the plugin app config.

Reviewed changes

Copilot reviewed 4 out of 5 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
uv.lock	Adds mitol-django-observability (and its transitive deps like structlog) and removes direct OTel deps.
pyproject.toml	Adds mitol-django-observability and removes direct opentelemetry-* API/SDK/exporter deps.
main/telemetry.py	Removes local OpenTelemetry configuration module.
main/settings.py	Adds observability app to INSTALLED_APPS and imports plugin-provided LOGGING.
main/apps.py	Removes explicit OpenTelemetry initialization in app ready().

[mbertrand]

uv sync might need to run one more time?

Noticed this difference in uv.lock when I ran it locally:

    { name = "mitol-django-observability", specifier = ">=2026.1.0" },

vs

    { name = "mitol-django-observability", specifier = ">=2026.1.0,<2027" },

[sentry]

Bug: The useCreateVerifiedProgramEnrollment hook invalidates the courseRunEnrollmentsList cache key instead of the correct programEnrollmentsList key after creating a program enrollment.
_{Severity: HIGH}

Suggested Fix

In the onSettled callback of the useCreateVerifiedProgramEnrollment hook, change the queryKey for queryClient.invalidateQueries from enrollmentKeys.courseRunEnrollmentsList() to enrollmentKeys.programEnrollmentsList() to ensure the correct cache is invalidated.

Prompt for AI Agent

Review the code at the location below. A potential bug has been identified by an AI
agent.
Verify if this is a real issue. If it is, propose a fix; if not, explain why it's not
valid.

Location: frontends/api/src/mitxonline/hooks/enrollment/index.ts#L97-L99

Potential issue: The `useCreateVerifiedProgramEnrollment` hook is designed to create a
verified program enrollment. However, in its `onSettled` callback, it incorrectly
invalidates the TanStack Query cache for course run enrollments
(`enrollmentKeys.courseRunEnrollmentsList()`) instead of program enrollments
(`enrollmentKeys.programEnrollmentsList()`). This mismatch means that after a user
successfully enrolls in a program, the UI component displaying their program enrollments
will not update, showing stale data until a full page refresh.

_{Did we get this right? 👍 / 👎 to inform future reviews.}

[mbertrand]

👍