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---
layout: default
title: Log enrichment
parent: Common use cases
nav_order: 35
---
# Log enrichment
You can perform different types of log enrichment with Data Prepper, including:
- Filtering.
- Extracting key-value pairs from strings.
- Mutating events.
- Mutating strings.
- Converting lists to maps.
- Processing incoming timestamps.
## Filtering
Use the [`drop_events`]({{site.url}}{{site.baseurl}}/data-prepper/pipelines/configuration/processors/drop-events/) processor to filter out specific log events before sending them to a sink. For example, if you're collecting web request logs and only want to store unsuccessful requests, you can create the following pipeline, which drops any requests for which the response is less than 400 so that only log events with HTTP status codes of 400 and higher remain.
```json
log-pipeline:
source:
...
processor:
- grok:
match:
log: [ "%{COMMONAPACHELOG_DATATYPED}" ]
- drop_events:
drop_when: "/response < 400"
sink:
- opensearch:
...
index: failure_logs
```
{% include copy-curl.html %}
The `drop_when` option specifies which events to drop from the pipeline.
## Extracting key-value pairs from strings
Log data often includes strings of key-value pairs. For example, if a user queries a URL that can be paginated, the HTTP logs might contain the following HTTP query string:
```json
page=3&q=my-search-term
```
{% include copy-curl.html %}
To perform analysis using the search terms, you can extract the value of `q` from a query string. The [`key_value`]({{site.url}}{{site.baseurl}}/data-prepper/pipelines/configuration/processors/key-value/) processor provides robust support for extracting keys and values from strings.
The following example combines the `split_string` and `key_value` processors to extract query parameters from an Apache log line:
```json
pipeline
...
processor:
- grok:
match:
message: [ "%{COMMONAPACHELOG_DATATYPED}" ]
- split_string:
entries:
- source: request
delimiter: "?"
- key_value:
source: "/request/1"
field_split_characters: "&"
value_split_characters: "="
destination: query_params
```
{% include copy-curl.html %}
## Mutating events
The different [mutate event]({{site.url}}{{site.baseurl}}/data-prepper/pipelines/configuration/processors/mutate-event/) processors let you rename, copy, add, and delete event entries.
In this example, the first processor sets the value of the `debug` key to `true` if the key already exists in the event. The second processor only sets the `debug` key to `true` if the key doesn't exist in the event because `overwrite_if_key_exists` is set to `true`.
```json
...
processor:
- add_entries:
entries:
- key: "debug"
value: true
...
processor:
- add_entries:
entries:
- key: "debug"
value: true
overwrite_if_key_exists: true
...
```
{% include copy-curl.html %}
You can also use a format string to construct new entries from existing events. For example, `${date}-${time}` will create a new entry based on the values of the existing entries `date` and `time`.
For example, the following pipeline adds new event entries dynamically from existing events:
```json
processor:
- add_entries:
entries:
- key: "key_three"
format: "${key_one}-${key_two}
```
{% include copy-curl.html %}
Consider the following incoming event:
```json
{
"key_one": "value_one",
"key_two": "value_two"
}
```
{% include copy-curl.html %}
The processor transforms it into an event with a new key named `key_three`, which combines values of other keys in the original event, as shown in the following example:
```json
{
"key_one": "value_one",
"key_two": "value_two",
"key_three": "value_one-value_two"
}
```
{% include copy-curl.html %}
## Mutating strings
The various [mutate string]({{site.url}}{{site.baseurl}}/data-prepper/pipelines/configuration/processors/mutate-string/) processors offer tools that you can use to manipulate strings in incoming data. For example, if you need to split a string into an array, you can use the `split_string` processor:
```json
...
processor:
- split_string:
entries:
- source: "message"
delimiter: "&"
...
```
{% include copy-curl.html %}
The processor will transform a string such as `a&b&c` into `["a", "b", "c"]`.
## Converting lists to maps
The [`list_to_map`]({{site.url}}{{site.baseurl}}/data-prepper/pipelines/configuration/processors/list-to-map/) processor, which is one of the mutate event processors, converts a list of objects in an event to a map.
For example, consider the following processor configuration:
```json
...
processor:
- list_to_map:
key: "name"
source: "A-car-as-list"
target: "A-car-as-map"
value_key: "value"
flatten: true
...
```
{% include copy-curl.html %}
The following processor will convert an event that contains a list of objects to a map like this:
```json
{
"A-car-as-list": [
{
"name": "make",
"value": "tesla"
},
{
"name": "model",
"value": "model 3"
},
{
"name": "color",
"value": "white"
}
]
}
```
{% include copy-curl.html %}
```json
{
"A-car-as-map": {
"make": "tesla",
"model": "model 3",
"color": "white"
}
}
```
{% include copy-curl.html %}
As another example, consider an incoming event with the following structure:
```json
{
"mylist" : [
{
"somekey" : "a",
"somevalue" : "val-a1",
"anothervalue" : "val-a2"
},
{
"somekey" : "b",
"somevalue" : "val-b1",
"anothervalue" : "val-b2"
},
{
"somekey" : "b",
"somevalue" : "val-b3",
"anothervalue" : "val-b4"
},
{
"somekey" : "c",
"somevalue" : "val-c1",
"anothervalue" : "val-c2"
}
]
}
```
{% include copy-curl.html %}
You can define the following options in the processor configuration:
```json
...
processor:
- list_to_map:
key: "somekey"
source: "mylist"
target: "myobject"
value_key: "value"
flatten: true
...
```
{% include copy-curl.html %}
The processor modifies the event by removing `mylist` and adding the new `myobject` object:
```json
{
"myobject" : {
"a" : [
{
"somekey" : "a",
"somevalue" : "val-a1",
"anothervalue" : "val-a2"
}
],
"b" : [
{
"somekey" : "b",
"somevalue" : "val-b1",
"anothervalue" : "val-b2"
},
{
"somekey" : "b",
"somevalue" : "val-b3",
"anothervalue" : "val-b4"
}
"c" : [
{
"somekey" : "c",
"somevalue" : "val-c1",
"anothervalue" : "val-c2"
}
]
}
}
```
{% include copy-curl.html %}
In many cases, you may want to flatten the array for each key. In these situations, you must choose only one object to retain. The processor offers a choice of either first or last. For example, consider the following:
```json
...
processor:
- list_to_map:
key: "somekey"
source: "mylist"
target: "myobject"
flatten: true
...
```
{% include copy-curl.html %}
The incoming event structure is then flattened accordingly:
```json
{
"myobject" : {
"a" : {
"somekey" : "a",
"somevalue" : "val-a1",
"anothervalue" : "val-a2"
},
"b" : {
"somekey" : "b",
"somevalue" : "val-b1",
"anothervalue" : "val-b2"
}
"c" : {
"somekey" : "c",
"somevalue" : "val-c1",
"anothervalue" : "val-c2"
}
}
}
```
{% include copy-curl.html %}
## Processing incoming timestamps
The [`date`]({{site.url}}{{site.baseurl}}/data-prepper/pipelines/configuration/processors/date/) processor parses the `timestamp` key from incoming events by converting it to International Organization for Standardization (ISO) 8601 format:
```json
...
processor:
- date:
match:
- key: timestamp
patterns: ["dd/MMM/yyyy:HH:mm:ss"]
destination: "@timestamp"
source_timezone: "America/Los_Angeles"
destination_timezone: "America/Chicago"
locale: "en_US"
...
```
{% include copy-curl.html %}
If the preceding pipeline processes the following event:
```json
{"timestamp": "10/Feb/2000:13:55:36"}
```
{% include copy-curl.html %}
It converts the event to the following format:
```json
{
"timestamp":"10/Feb/2000:13:55:36",
"@timestamp":"2000-02-10T15:55:36.000-06:00"
}
```
{% include copy-curl.html %}
### Generating timestamps
The `date` processor can generate timestamps for incoming events if you specify `@timestamp` for the `destination` option:
```json
...
processor:
- date:
from_time_received: true
destination: "@timestamp"
...
```
{% include copy-curl.html %}
### Deriving punctuation patterns
The [`substitute_string`]({{site.url}}{{site.baseurl}}/data-prepper/pipelines/configuration/processors/substitute-string/) processor (which is one of the mutate string processors) lets you derive a punctuation pattern from incoming events. In the following example pipeline, the processor will scan incoming Apache log events and derive punctuation patterns from them:
```json
processor:
- substitute_string:
entries:
- source: "message"
from: "[a-zA-Z0-9_]+"
to:""
- source: "message"
from: "[ ]+"
to: "_"
```
{% include copy-curl.html %}
The following incoming Apache HTTP log will generate a punctuation pattern:
```json
[{"message":"10.10.10.11 - admin [19/Feb/2015:15:50:36 -0500] \"GET /big2.pdf HTTP/1.1\" 200 33973115 0.202 \"-\" \"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/40.0.2214.111 Safari/537.36\""}]
{"message":"..._-_[//:::_-]_\"_/._/.\"_._\"-\"_\"/._(;_)_/._(,_)_/..._/.\""}
```
{% include copy-curl.html %}
You can count these generated patterns by passing them through the [`aggregate`]({{site.url}}{{site.baseurl}}/data-prepper/pipelines/configuration/processors/aggregate/) processor with the `count` action.
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