Celery Beat auto monitoring

[antonpirker]

Automatically monitor Celery Beat tasks with Sentry Crons.

How we do this:

• we dynamically create a function that listens to the celery_beat_init hook. In the hook we do two things:
• 1.) patch existing scheduled tasks (in sender.scheduler.schedule):
  • Each scheduled task is patched to contain information about the Sentry monitor (the monitor slug and config (timezone, schedule, ...) in its headers.
  • We then stop Celery Beat and replace the scheduled tasks with the new patched scheduled tasks
  • We restart Celery Beat to enable our patched tasks
• 2.) Connect each task to the following hooks to send information about the task to sentry: task_prerun, task_success, task_failure, task_retry. (config is sent by the tasks in its headers we set up in 1))

Docs: getsentry/sentry-docs#6526

[sl0thentr0py]

can you please summarize the important moving parts in the PR description? at least a high level overview of what we're patching etc

[HazAT]

Rubberstamp ✅

Changes to PR description done