# Logstash is not parsing all logs

**URL:** <https://discuss.elastic.co/t/logstash-is-not-parsing-all-logs/163530>\
**Category:** Logstash\
**Created:** [January 9, 2019, 12:47pm UTC](https://discuss.elastic.co/t/logstash-is-not-parsing-all-logs/163530 "2019-01-09T12:47:47Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![thirty2](https://avatars.discourse-cdn.com/v4/letter/t/a9a28c/32.png) [@thirty2](https://discuss.elastic.co/u/thirty2)\
**Post date:** [January 9, 2019, 12:47pm UTC](https://discuss.elastic.co/t/logstash-is-not-parsing-all-logs/163530/1 "2019-01-09T12:47:48Z")

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Hi,

I have implemented simple filter, just to add a tag to the logs, filter:

filter {  
if [src] == "source\_syslog" {  
mutate {  
add\_tag =\> ["beparsed"]  
}  
}  
}

output {  
elasticsearch {  
index =\> "logstash-%{+xxxx.ww}"  
hosts =\> ["[ip]:9200","[ip]:9200","[ip]:9200"]  
manage\_template =\> true  
}  
}

When checking in Kibana i can see that some logs are with a tag and some are not. What can be a reason for that?  
Thanks

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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:** [February 6, 2019, 12:56pm UTC](https://discuss.elastic.co/t/logstash-is-not-parsing-all-logs/163530/2 "2019-02-06T12:56:31Z")

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