# How to get Hostname in email subject for Diskspace alert
**URL:** https://discuss.elastic.co/t/how-to-get-hostname-in-email-subject-for-diskspace-alert/137510
**Category:** Elasticsearch
**Tags:** elastic-stack-alerting
**Created:** [June 26, 2018, 9:09pm UTC](https://discuss.elastic.co/t/how-to-get-hostname-in-email-subject-for-diskspace-alert/137510 "2018-06-26T21:09:26Z")
**Posts on this page:** 5
**Page:** 1
### Author:  [@rpendela](https://discuss.elastic.co/u/rpendela)
#### Post date: [June 26, 2018, 9:09pm UTC](https://discuss.elastic.co/t/how-to-get-hostname-in-email-subject-for-diskspace-alert/137510/1 "2018-06-26T21:09:27Z")
My issue also similar to this [topic](https://discuss.elastic.co/t/watcher-not-sending-email-to-alert-on-disk-space/135742) but I am not using any advance query, I can see my threshold query is executing but I want to see the host name in email subject
Here is my Threshold alert
I want to see email notification as
`Watch [Disk space] has exceeded the threshold on AWSN`
Here is my email subject ( I tried couple of things like below)
```
Watch [{{ctx.metadata.name}}] has exceeded the threshold on [{{ctx.payload.aggregations.beat.hostname}}]
Watch [{{ctx.metadata.name}}] has exceeded the threshold on [{{ctx.payload.beat.hostname}}]
Watch [{{ctx.metadata.name}}] has exceeded the threshold on [{{ctx.payload.beat.name}}]
```
Please help me to figure what I am missing to get hostname in email?
---
### Author:  [@spinscale](https://discuss.elastic.co/u/spinscale)
#### Post date: [June 27, 2018, 7:10am UTC](https://discuss.elastic.co/t/how-to-get-hostname-in-email-subject-for-diskspace-alert/137510/2 "2018-06-27T07:10:35Z")
can you run the [execute watch API](https://www.elastic.co/guide/en/elasticsearch/reference/6.3/watcher-api-execute-watch.html) in the dev tools for this watch and show us the result?
---
### Author:  [@rpendela](https://discuss.elastic.co/u/rpendela)
#### Post date: [June 27, 2018, 4:44pm UTC](https://discuss.elastic.co/t/how-to-get-hostname-in-email-subject-for-diskspace-alert/137510/5 "2018-06-27T16:44:59Z")
Thanks @spinscale I found the solution what I need from the community here but would like to know is there a way that I can see alerts for specific hosts with wildcard?, I have a multiple servers but I want to watch specifically on my AD servers.
Here is what I have now,
{
"trigger": {
"schedule": {
"interval": "15m"
}
},
"input": {
"search": {
"request": {
"search\_type": "query\_then\_fetch",
"indices": [
"metricbeat-_"
],
"types": [],
"body": {
"size": 0,
"query": {
"bool": {
"filter": {
"range": {
"@timestamp": {
"gte": "{{ctx.trigger.scheduled\_time}}||-15m",
"lte": "{{ctx.trigger.scheduled\_time}}",
"format": "strict\_date\_optional\_time||epoch\_millis"
}
}
},
"should": [
{
"match\_phrase": {
"beat.hostname": "ADDC1"
}
},
{
"match\_phrase": {
"beat.hostname": "ADDC2"
}
},
{
"match\_phrase": {
"beat.hostname": "addctcde1"
}
}
],
"minimum\_should\_match": 1
}
},
"aggs": {
"bucketAgg": {
"terms": {
"field": "beat.hostname",
"size": 10,
"order": {
"metricAgg": "desc"
}
},
"aggs": {
"metricAgg": {
"max": {
"field": "system.filesystem.used.pct"
}
}
}
}
}
}
}
}
},
"condition": {
"script": {
"source": "ArrayList arr = ctx.payload.aggregations.bucketAgg.buckets; for (int i = 0; i \< arr.length; i++) { if (arr[i]['metricAgg'].value \> params.threshold) { return true; } } return false;",
"lang": "painless",
"params": {
"threshold": 0.85
}
}
},
"actions": {
"email\_1": {
"email": {
"profile": "standard",
"priority": "high",
"to": [
"test@domain.com",
],
"subject": "Watch [{{ctx.metadata.name}}] has exceeded the threshold on \n{{#ctx.payload.results}}{{key}}\n{{/ctx.payload.results}}",
"body": {
"text": "The following hosts have exceeded the threshold: \n{{#ctx.payload.results}}{{key}}:{{value}}\n{{/ctx.payload.results}}"
}
}
}
},
"metadata": {
"color": "red"
},
"transform": {
"script": {
"source": "HashMap result = new HashMap(); ArrayList arr = ctx.payload.aggregations.bucketAgg.buckets; ArrayList filteredHits = new ArrayList(); for (int i = 0; i \< arr.length; i++) { HashMap filteredHit = new HashMap(); filteredHit.key = arr[i].key; filteredHit.value = Math.round(arr[i]['metricAgg'].value_100); if (filteredHit.value \> params.threshold) { filteredHits.add(filteredHit); } } result.results = filteredHits; return result;",
"lang": "painless",
"params": {
"threshold": 85
}
}
}
}
---
### Author:  [@spinscale](https://discuss.elastic.co/u/spinscale)
#### Post date: [June 29, 2018, 8:43am UTC](https://discuss.elastic.co/t/how-to-get-hostname-in-email-subject-for-diskspace-alert/137510/6 "2018-06-29T08:43:18Z")
Hey,
if you have a certain hostname scheme, you could use a `prefix` query in your watch that searches for `ldap-` in the hostname field (or sth similar), and thus find all the LDAP servers.
Hope that helps!
--Alex
---
### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [July 27, 2018, 8:43am UTC](https://discuss.elastic.co/t/how-to-get-hostname-in-email-subject-for-diskspace-alert/137510/7 "2018-07-27T08:43:24Z")
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