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blank() filter #226

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Merged
merged 2 commits into from
Aug 13, 2025
Merged

blank() filter #226

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abbdee5
Added blank filter.
zsoltgyulai94 Aug 6, 2025
247f6a5
Replaced "field or value" phrase with "key-value pair".
zsoltgyulai94 Aug 13, 2025
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23 changes: 23 additions & 0 deletions doc/_admin-guide/080_Log/030_Filters/005_Filter_functions/013_blank.md
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@@ -0,0 +1,23 @@
---
title: blank()
id: adm-log-filters-blank
description: >-
This section describes blank() filter function in {{ site.product.short_name }}.
---

*Synopsis:* blank("MESSAGE")


*Description:* The blank() filter selects messages where the specified field or value is considered blank. A value is considered blank if it meets any of the following conditions:
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"key-value pair" would be more accurate instead of "field or value"

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Thanks, re-phrased.


* It is not set
* It is an empty string ("")
* It contains only whitespace characters
* It is an empty list
* It is a boolean value explicitly set to false

## Example: Select log messages where the field MESSAGE is blank

```config
blank("MESSAGE")
```
2 changes: 2 additions & 0 deletions doc/_admin-guide/080_Log/030_Filters/005_Filter_functions/README.md
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Expand Up @@ -24,3 +24,5 @@ described in Filters.
|rate-limit() |Limits messages rate based on arbitrary keys in each message. |
|source()|Select messages of the specified {{ site.product.short_name }} source statement.|
|tags()|Select messages having the specified tag.|
|blank()|Filter messages where the specified value is blank (unset, empty, whitespace-only, empty list, or boolean false).|