# Watcher to monitor Logstash Pipeline "Events Emitted Rate" **URL:** \ **Category:** Logstash\ **Created:** [January 7, 2020, 12:10am UTC](https://discuss.elastic.co/t/watcher-to-monitor-logstash-pipeline-events-emitted-rate/213958 "2020-01-07T00:10:24Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![SSS1](https://avatars.discourse-cdn.com/v4/letter/s/13edae/32.png) [@SSS1](https://discuss.elastic.co/u/SSS1)\ **Post date:** [January 7, 2020, 12:10am UTC](https://discuss.elastic.co/t/watcher-to-monitor-logstash-pipeline-events-emitted-rate/213958/1 "2020-01-07T00:10:25Z")
Hi, I need to create a Watcher to alert when a pipeline's "Events Emitted Rate" value drops below a certain threshold. Is this possible to do in the current monitoring tools? I've tried to run querying myself, but can only find the total emitted over the lifetime duration. ---
**Author:** ![rugenl](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/rugenl/32/12887_2.png) [@rugenl](https://discuss.elastic.co/u/rugenl)\ **Post date:** [January 7, 2020, 4:16am UTC](https://discuss.elastic.co/t/watcher-to-monitor-logstash-pipeline-events-emitted-rate/213958/2 "2020-01-07T04:16:52Z")
You might be able to use the serial differencing aggregation. I did this in Zabbix, for example see [https://github.com/rugenl/zabbix-logstash](https://github.com/rugenl/zabbix-logstash). Zabbix has the ability to store the difference for items such as these. ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [February 4, 2020, 4:17am UTC](https://discuss.elastic.co/t/watcher-to-monitor-logstash-pipeline-events-emitted-rate/213958/3 "2020-02-04T04:17:04Z")
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