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Formula - ContextKey

Use the contextKey Formula function with a regular expression to extract matching Key-names from the Log Event context (Key-Value collection).

Quick example

Let's get you started with the following example (Get all Keys matching the provided regular expression)

Input Expression Result 
Order#123  
Order#456  
Order#789  
City=Karlstad  
...

contextKey(regex('Order#.*'))

Order#123
Order#456
Order#789
Text Data Context Unique values

Features

  • Extracts all Key names from the Key-Value collection (Context)

How to use

To configure the Formula plugin with the contextKey function:

  1. Select Formula as the expression type plugin.
  2. Write down the expression to use in the 'Expression' text area with the named Key to extract contextKey(regex('Order#.*'))
  3. The Context Key names are displayed in the Message Context tab
  4. The result is displayed

Extract context keys

Syntax

The contextKey function has the following syntax:

contextKey(regex('Expression'))

Next Step

Expression Type Plugins are used in Search Fields
What are Search Fields?
What are Search Field Expressions?
What are Message Types?
What are Log Views?