# MQTT Engine: auto-prune removed metrics?

**URL:** <https://forum.inductiveautomation.com/t/mqtt-engine-auto-prune-removed-metrics/46785>\
**Category:** Ignition\
**Tags:** ignition80\
**Created:** [May 17, 2021, 3:42pm UTC](https://forum.inductiveautomation.com/t/mqtt-engine-auto-prune-removed-metrics/46785 "2021-05-17T15:42:14Z")\
**Posts on this page:** 1\
**Showing post:** 4

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**Author:** ![321liftoff](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/321liftoff/32/27544_2.png) [@321liftoff](https://forum.inductiveautomation.com/u/321liftoff)\
**Post date:** [May 18, 2021, 3:00pm UTC](https://forum.inductiveautomation.com/t/mqtt-engine-auto-prune-removed-metrics/46785/4 "2021-05-18T15:00:01Z")

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I also see that restarting the MQTT Engine purges “Bad\_Stale” tags.

It’s interesting that the folder structure is retained (groupID/nodeID/Node Info, etc) but the tags representing the metrics themselves are not retained across restarts.

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