Azure Function app Cron scheduler - missing runs

Question

My function app is a timer triggered app and uses this cron expression for scheduling. 10 */6 * * * On most days it runs fine, but looking at the trace logs in Application insights it does not run for every 6 hours some days. Here is an example where it did not Trying to find an explanation. Where do I look? Checked app insights for the function app

akseli · Accepted Answer · 2025-11-19 13:40:09Z

0

Azure Functions doesn't actually use CRON expressions, but rather, NCRON expressions.

Instead of the typical 5 elements from a CRON expression, NCRON expects 6 elements: {second} {minute} {hour} {day} {month} {day-of-week}

I ran into similar issues in the past where execution sometimes worked, and sometimes didn't when using the 5 element expression instead of the required 6 element version.

You can find documentation regarding NCRON usage here.

answered Nov 19 at 13:40

akseli

3,0891 gold badge27 silver badges34 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

Azure Function app Cron scheduler - missing runs

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related