X509FederationClient httpClient resource leak

We're using InstancePrincipalsAuthenticationDetailsProvider as part of our canary test run with MicronautTest. Since the test is run periodically, we've observed a resource leak, where live threads increase for each canary run.

The resource leak seems to be com.oracle.bmc.auth.internal.X509FederationClient leaving a leaked httpClient. This may need to be closed at something similar to preDestroy in Micronaut or make X509FederationClient closeable. Thanks.

The client causing resource leak snippet is as below.

this.httpClient = HttpProvider.getDefault() .newBuilder() .baseUri(URI.create(federationEndpoint)) .property(StandardClientProperties.ASYNC_POOL_SIZE, 1) .registerRequestInterceptor( Priorities.AUTHENTICATION, new AuthnClientFilter( new RequestSignerImpl( keySupplier, SigningStrategy.STANDARD, keyIdSupplier), Collections.emptyMap())) .registerRequestInterceptor( Priorities.HEADER_DECORATOR, new ClientIdFilter()) .registerRequestInterceptor(Priorities.USER, new LogHeadersFilter()) .build(); this.circuitBreaker = CircuitBreakerHelper.makeCircuitBreaker(this.httpClient, circuitBreakerConfig);

Start at X509FederationClient and the InstancePrincipalsAuthenticationDetailsProvider usage shown in the issue; trace how the httpClient and circuitBreaker are created and owned. Reproduce the leak with repeated MicronautTest canary runs, then verify that the client resources are released during the appropriate lifecycle or close operation.