code: /*
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements.  See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF licenses this file to You under the Apache License, Version 2.0
   * (the "License"); you may not use this file except in compliance with
   * the License.  You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   *
   */
  
  package org.apache.skywalking.oap.server.core.analysis.worker;
  
  /**
   * MetricStreamKind represents the kind of metric character.
   */
  public enum MetricStreamKind {
      /**
       * Metric built by {@link org.apache.skywalking.oap.server.core.oal.rt.OALEngine}
       *
       * OAL is SkyWalking native metrics from SkyWalking native analyzers, for traces and service mesh logs.
       * The {@link org.apache.skywalking.oap.server.core.source.Source} implementations represent the raw traffic.
       *
       * The significant different between OAL and {@link #MAL} type is, the traffic load of OAL metrics is much more.
       * So,in the stream process, kernel assigned larger buffer and more resources for this kind.
       */
      OAL,
      /**
       * Metric built by {@link org.apache.skywalking.oap.server.core.analysis.meter.MeterSystem}
       *
       * MAL metrics are from existing metric system, such as SkyWalking meter, Prometheus, OpenTelemetry
       */
      MAL
  }
  