public static Role fromName(String name) {
            for (Role role : Role.values()) {
                if (role.name().equalsIgnoreCase(name)) {
                    return role;
                }
            }
            return Mixed;
        }
Aggregator mode OAP receives data from {@link #Mixed} and {@link #Aggregator} OAP nodes, and do 2nd round
aggregation. Then save the final result to the storage.
oap-server/server-core/src/main/java/org/apache/skywalking/oap/server/core/CoreModuleConfig.java