private HttpResponse quotaUsage(ApplicationId applicationId) {
        double quotaUsageRate = applicationRepository.getQuotaUsageRate(applicationId);
        return new QuotaUsageResponse(quotaUsageRate);
    }
Operations on applications (delete, wait for config convergence, restart, application content etc.)

@author hmusum
configserver/src/main/java/com/yahoo/vespa/config/server/http/v2/ApplicationHandler.java