Auto-configure observations for RestClients #38500
Description
I was trying out Spring Boot 3.2.0-RC2 and was quite surprised that a RestClient created via RestClient.builder().build() is not auto-instrumented like RestTemplate and WebClient currently are. If I create a RestClientCustomizer in a similar fashion to RestTemplateObservationConfiguration, then observations are properly created for HTTP requests as one could expect:
@Bean RestClientCustomizer observationRestClientCustomizer( ObservationRegistry observationRegistry, ObjectProvider<ClientRequestObservationConvention> customConvention, ObservationProperties properties) { String name = properties.getHttp().getClient().getRequests().getName(); ClientRequestObservationConvention observationConvention = customConvention .getIfAvailable(() -> new DefaultClientRequestObservationConvention(name)); return builder -> builder .observationRegistry(observationRegistry) .observationConvention(observationConvention); }Adding this as an auto configuration would improve the out-of-the-box experience for the new RestClient.