@Override
    public String getComponentName(int componentId) {
        String componentName = componentId2Name.get(componentId);

        return componentName == null ? componentId2Name.get(0) : componentName;
    }
Key is the component ID.
Value is the priority.
oap-server/server-core/src/main/java/org/apache/skywalking/oap/server/core/config/ComponentLibraryCatalogService.java