[KAFKA-15469] Document built-in configuration providers

• Type: Task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 3.9.0
• Component/s: documentation
• Assignee: Paul Mellor
• Reporter: Mickael Maison
• Created: 15/Sep/23 11:11
• Updated: 30/Jul/24 13:36
• Resolved: 30/Jul/24 12:46

Description

Kafka has 3 built-in ConfigProvider implementations:

• DirectoryConfigProvider
• EnvVarConfigProvider
• FileConfigProvider

These don't appear anywhere in the documentation. We should at least mention them and probably even demonstrate how to use them.