private static ApplicationId createApplicationId(Inspector params, TenantName tenant) {
        return new ApplicationId.Builder()
                .tenant(tenant)
                .applicationName(SlimeUtils.optionalString(params.field(APPLICATION_NAME_PARAM_NAME)).orElse("default"))
                .instanceName(SlimeUtils.optionalString(params.field(INSTANCE_PARAM_NAME)).orElse("default"))
                .build();
    }
Parameters for preparing an application. Immutable.

@author Ulf Lilleengen
configserver/src/main/java/com/yahoo/vespa/config/server/session/PrepareParams.java