Crons: Celerybeat integration provides invalid Crontab schedule

[gaprl]

How do you use Sentry?

Sentry Saas (sentry.io)

Version

2.3.1

Steps to Reproduce

Create a new Celery task with a crontab schedule of "0 0 saturday". The monitor for the task won't be upserted in Crons.

Expected Result

The monitor and check-ins should be created in Crons.

Actual Result

This happens because 0 0 * * saturday is not a valid crontab schedule, but it is a valid task schedule in Celery.

This is the complete payload that has failed validation on our end:

{
    "check_in_id": "82f57c609739414a8e21a88165fd52d8",
    "contexts": {
        "trace": {
            "trace_id": "8e424a9d5c7b462b8ccb638b3b9c98cc"
        }
    },
    "duration": 1602.9272508621216,
    "environment": "prod",
    "monitor_config": {
        "schedule": {
            "type": "crontab",
            "value": "0 0 * * saturday"
        },
        "timezone": "UTC"
    },
    "monitor_slug": "schedule-weekly-organization-reports-new",
    "status": "ok"
}

Here's the definition for the task: https://github.com/getsentry/sentry/blob/d92153e4f39810ed5b91a1e5e340a51e3cf507ec/src/sentry/conf/server.py#L1112-L1116

Perhaps we can map these unique Celery schedule definitions to a valid Crontab? Celery also supports solar schedules, so not sure what we want to do there.

[antonpirker]

As for solar schedules: we currently only support crontab and schedule schedules in Celery, for everything else we print a warning: https://github.com/getsentry/sentry-python/blob/antonpirker/trace-origin-in-integrations/sentry_sdk/integrations/celery/beat.py#L90

[antonpirker]

About the invalid Celery crontab definition. We probably need to improve our transaction from Celery crontab definition to the one we send to Sentry implemented here: https://github.com/getsentry/sentry-python/blob/antonpirker/trace-origin-in-integrations/sentry_sdk/integrations/celery/beat.py#L67-L75