Frontend allows cron expression, but backend says it's not parsable

[ThiesR]

Environment

SaaS (https://sentry.io/)

Steps to Reproduce

Create new cron monitor with cron expression '0,15,30,45 6-20 ? * 1-5'

Expected Result

The cron expression should be valid or the documentation should better define which expressions are allowed. Also the behaviour of frontend and backend should be consistent.

Actual Result

While the frontend can parse the expression and describe the interval the backend says the expression is not parsable.

Product Area

Crons

Link

No response

DSN

No response

Version

No response

[getsantry]

Assigning to @getsentry/support for routing, due by Wednesday, May 24th at 5:00 pm (sfo). ⏲️

[getsantry]

Routing to @getsentry/product-owners-crons for triage, due by Thursday, May 25th at 5:00 pm (sfo). ⏲️

[davidenwang]

Hello @ThiesR thanks so much for using our crons beta feature and apologies for the confusion here. Unfortunately, we use two different libraries to interpret the schedule on the frontend and then parse it on the backend. Because the crontab syntax doesn't have a very strict standard it becomes quite hard to ensure the same behavior between frontend and backend, but something we're looking into at the moment.