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.telemetry.api;
  
  import java.util.List;
  import lombok.AllArgsConstructor;
  import lombok.EqualsAndHashCode;
  import lombok.ToString;
  
  /**
   * MetricFamily define a metric and all its samples.
   */
  @AllArgsConstructor
  @EqualsAndHashCode
  @ToString
  public class MetricFamily {
  
      public final String name;
      public final Type type;
      public final String help;
      public final List<Sample> samples;
  
      public enum Type {
          COUNTER, GAUGE, SUMMARY, HISTOGRAM, UNTYPED,
      }
  
      /**
       * A single Sample, with a unique name and set of labels.
       */
      @AllArgsConstructor
      @EqualsAndHashCode
      @ToString
      public static class Sample {
          public final String name;
          public final List<String> labelNames;
          public final List<String> labelValues;  // Must have same length as labelNames.
          public final double value;
          public final Long timestampMs;  // It's an epoch format with milliseconds value included (this field is subject to change).
  
      }
  }
  