# Custom Alert API

**URL:** <https://community.dynatrace.com/t/custom-alert-api/22515>\
**Category:** Alerting\
**Tags:** problems-classic\
**Created:** [November 8, 2019, 11:02am UTC](https://community.dynatrace.com/t/custom-alert-api/22515 "2019-11-08T11:02:28Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![henk\_stobbe](https://dub1.discourse-cdn.com/dynatrace/user_avatar/community.dynatrace.com/henk_stobbe/32/30434_2.png) [@henk\_stobbe](https://community.dynatrace.com/u/henk_stobbe)\
**Post date:** [November 8, 2019, 11:02am UTC](https://community.dynatrace.com/t/custom-alert-api/22515/1 "2019-11-08T11:02:28Z")

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Hello,

When I define a custom alert on a process group metric, a entity is needed to function?

KR Henk

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**Author:** ![wolfgang\_beer](https://dub1.discourse-cdn.com/dynatrace/user_avatar/community.dynatrace.com/wolfgang_beer/32/14717_2.png) [@wolfgang\_beer](https://community.dynatrace.com/u/wolfgang_beer)\
**Post date:** [November 8, 2019, 11:33am UTC](https://community.dynatrace.com/t/custom-alert-api/22515/2 "2019-11-08T11:33:49Z")

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Hi Henk,

No, if you don’t specify a filter rule it applies to all process groups. But please mind that there are only few metrics on process groups. Most metrics are on process group instances and you use the process group to filter the group of processes you want to alert on.

Best greetings,

Wolfgang