# Is it possible to extend ion.cast/event, alert format

**URL:** <https://forum.datomic.com/t/is-it-possible-to-extend-ion-cast-event-alert-format/2332>\
**Category:** Datomic Cloud\
**Created:** [October 19, 2023, 3:54pm UTC](https://forum.datomic.com/t/is-it-possible-to-extend-ion-cast-event-alert-format/2332 "2023-10-19T15:54:59Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![eoliphant](https://avatars.discourse-cdn.com/v4/letter/e/96bed5/32.png) [@eoliphant](https://forum.datomic.com/u/eoliphant)\
**Post date:** [October 19, 2023, 3:54pm UTC](https://forum.datomic.com/t/is-it-possible-to-extend-ion-cast-event-alert-format/2332/1 "2023-10-19T15:54:59Z")

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Hi, we’ve wired up our cloud instances with the open telemetry agent and it’s working quite well. One thing we want to add now is the trace/span id to log messages. with log4j/etc it’s just a matter updating the log format to pull it from the MDC. i’d like to do something similar with cast, add a trace id field to the map if it’s available. But as far as i can tell there aren’t any extension/customization points.