# Drop event

**URL:** <https://discuss.elastic.co/t/drop-event/127328>\
**Category:** Logstash\
**Created:** [April 9, 2018, 1:18pm UTC](https://discuss.elastic.co/t/drop-event/127328 "2018-04-09T13:18:25Z")\
**Posts on this page:** 9\
**Page:** 1

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**Author:** ![elk2](https://avatars.discourse-cdn.com/v4/letter/e/f14d63/32.png) [@elk2](https://discuss.elastic.co/u/elk2)\
**Post date:** [April 9, 2018, 1:18pm UTC](https://discuss.elastic.co/t/drop-event/127328/1 "2018-04-09T13:18:25Z")

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I would like to drop particular events from a log message that coming from a socket input.  
How can I do this?

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<div class="post-metadata">

**Author:** ![magnusbaeck](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/magnusbaeck/32/44943_2.png) [@magnusbaeck](https://discuss.elastic.co/u/magnusbaeck)\
**Post date:** [April 9, 2018, 1:23pm UTC](https://discuss.elastic.co/t/drop-event/127328/2 "2018-04-09T13:23:18Z")

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Use a drop filter to drop an event and wrap the filter in a conditional to make sure you don't drop all events.

[https://www.elastic.co/guide/en/logstash/current/event-dependent-configuration.html](https://www.elastic.co/guide/en/logstash/current/event-dependent-configuration.html)

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<div class="post-metadata">

**Author:** ![elk2](https://avatars.discourse-cdn.com/v4/letter/e/f14d63/32.png) [@elk2](https://discuss.elastic.co/u/elk2)\
**Post date:** [April 9, 2018, 2:44pm UTC](https://discuss.elastic.co/t/drop-event/127328/3 "2018-04-09T14:44:23Z")

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Thanks magnusbaeck.  
If I use a grok filter like this:

if [type] == "syslog" {

grok {  
match =\> [  
"message", "._google._"  
]  
add\_tag =\> "to\_drop"  
}  
}

When grok match I add a tag "to\_drop" otherwise no.

It's correct?

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<div class="post-metadata">

**Author:** ![magnusbaeck](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/magnusbaeck/32/44943_2.png) [@magnusbaeck](https://discuss.elastic.co/u/magnusbaeck)\
**Post date:** [April 9, 2018, 8:21pm UTC](https://discuss.elastic.co/t/drop-event/127328/4 "2018-04-09T20:21:21Z")

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That depends on what you want to accomplish. Drop all events whose `message` field contains "google"?

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<div class="post-metadata">

**Author:** ![elk2](https://avatars.discourse-cdn.com/v4/letter/e/f14d63/32.png) [@elk2](https://discuss.elastic.co/u/elk2)\
**Post date:** [April 10, 2018, 9:37am UTC](https://discuss.elastic.co/t/drop-event/127328/5 "2018-04-10T09:37:23Z")

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Yes. It's it. Thanks.

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<div class="post-metadata">

**Author:** ![magnusbaeck](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/magnusbaeck/32/44943_2.png) [@magnusbaeck](https://discuss.elastic.co/u/magnusbaeck)\
**Post date:** [April 10, 2018, 9:52am UTC](https://discuss.elastic.co/t/drop-event/127328/6 "2018-04-10T09:52:34Z")

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```nohighlight
if "google" in [message] {
  drop { }
}

```

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<div class="post-metadata">

**Author:** ![elk2](https://avatars.discourse-cdn.com/v4/letter/e/f14d63/32.png) [@elk2](https://discuss.elastic.co/u/elk2)\
**Post date:** [April 11, 2018, 7:58am UTC](https://discuss.elastic.co/t/drop-event/127328/7 "2018-04-11T07:58:12Z")

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Great! How can I log the dropped events? Maybe to check the first time if all work correctly.

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<div class="post-metadata">

**Author:** ![magnusbaeck](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/magnusbaeck/32/44943_2.png) [@magnusbaeck](https://discuss.elastic.co/u/magnusbaeck)\
**Post date:** [April 11, 2018, 8:25am UTC](https://discuss.elastic.co/t/drop-event/127328/8 "2018-04-11T08:25:24Z")

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I don't think there's a way of logging dropped events, but instead of dropping them you can add a tag and use the presence of that tag in the output section to conditionally log those events to a file rather than sending them to the usual outputs.

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<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [May 9, 2018, 8:26am UTC](https://discuss.elastic.co/t/drop-event/127328/9 "2018-05-09T08:26:18Z")

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