The configuration parameters for Eureka are divided into three groups:

Parameters for the Eureka server, prefixed with eureka.server.

Parameters for Eureka clients, prefixed with eureka.client. This is for clients who want to communicate with a Eureka server.

Parameters for Eureka instances, prefixed with eureka.instance. This is for the microservices instances that want to register themselves in the Eureka server.

https://cloud.spring.io/spring-cloud-netflix/multi/multi__service_discovery_eureka_clients.html