@Override
    public ApplicationConfiguration load() throws ConfigFileNotFoundException {
        ApplicationConfiguration configuration = new ApplicationConfiguration();
        this.loadConfig(configuration);
        this.overrideConfigBySystemEnv(configuration);
        return configuration;
    }
Initialize collector settings with following sources. Use application.yml as primary setting, and fix missing setting
by default settings in application-default.yml.
<p>
At last, override setting by system.properties and system.envs if the key matches moduleName.provideName.settingKey.
oap-server/server-starter/src/main/java/org/apache/skywalking/oap/server/starter/config/ApplicationConfigLoader.java