When Splunk encounters repeating JSON data structures in an event, they are extracted as multivalue fields.
These allow multiple values to be stored under a single field, which is common with arrays in JSON data.
When Splunk extracts repeating JSON data structures within a single event, it represents them asmultivalue fields. A multivalue field is a field that contains multiple values, which can be iterated over or expanded using commands likemvexpandorforeach.
Here's why this works:
* JSON Data Extraction: Splunk automatically parses JSON data into fields. If a JSON key has an array of values (e.g.,"products": ["productA", "productB", "productC"]), Splunk creates a multivalue field for that key.
* Multivalue Fields: These fields allow you to handle multiple values for the same key within a single event. For example, if the JSON keyproductscontains an array of product names, Splunk will store all the values in a single multivalue field namedproducts.
{
"event": "purchase",
"products": ["productA", "productB", "productC"]
}
References:
Splunk Documentation on JSON Data Extraction:https://docs.splunk.com/Documentation/Splunk/latest/Data
/ExtractfieldsfromJSON
Splunk Documentation on Multivalue Fields:https://docs.splunk.com/Documentation/Splunk/latest
/SearchReference/MultivalueEvalFunctions