@Override
    public List<TraceMetadataProvider> load(ClassLoader classLoader) {
        List<TraceMetadataProvider> traceMetadataProviders = new ArrayList<>();
        traceMetadataProviders.addAll(fromMetaFiles(classLoader));
        traceMetadataProviders.addAll(fromServiceLoader(classLoader));
        return traceMetadataProviders;
    }
@author HyunGil Jeong
@author Taejin Koo
agent-module/plugins-loader/src/main/java/com/navercorp/pinpoint/loader/plugins/trace/TraceMetadataProviderLoader.java