// Generated by the protocol buffer compiler.  DO NOT EDIT!
// source: google/api/metric.proto

package com.google.api;

/**
 * <pre>
 * Defines a metric type and its schema. Once a metric descriptor is created,
 * deleting or altering it stops data collection and makes the metric type's
 * existing data unusable.
 * </pre>
 *
 * Protobuf type {@code google.api.MetricDescriptor}
 */
public  final class MetricDescriptor extends
    com.google.protobuf.GeneratedMessageV3 implements
    // @@protoc_insertion_point(message_implements:google.api.MetricDescriptor)
    MetricDescriptorOrBuilder {
private static final long serialVersionUID = 0L;
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  public static final com.google.protobuf.Descriptors.Descriptor
      getDescriptor() {
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  }

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  /**
   * <pre>
   * The kind of measurement. It describes how the data is reported.
   * </pre>
   *
   * Protobuf enum {@code google.api.MetricDescriptor.MetricKind}
   */
  public enum MetricKind
      implements com.google.protobuf.ProtocolMessageEnum {
    /**
     * <pre>
     * Do not use this default value.
     * </pre>
     *
     * <code>METRIC_KIND_UNSPECIFIED = 0;</code>
     */
    METRIC_KIND_UNSPECIFIED(0),
    /**
     * <pre>
     * An instantaneous measurement of a value.
     * </pre>
     *
     * <code>GAUGE = 1;</code>
     */
    GAUGE(1),
    /**
     * <pre>
     * The change in a value during a time interval.
     * </pre>
     *
     * <code>DELTA = 2;</code>
     */
    DELTA(2),
    /**
     * <pre>
     * A value accumulated over a time interval.  Cumulative
     * measurements in a time series should have the same start time
     * and increasing end times, until an event resets the cumulative
     * value to zero and sets a new start time for the following
     * points.
     * </pre>
     *
     * <code>CUMULATIVE = 3;</code>
     */
    CUMULATIVE(3),
    UNRECOGNIZED(-1),
    ;

    /**
     * <pre>
     * Do not use this default value.
     * </pre>
     *
     * <code>METRIC_KIND_UNSPECIFIED = 0;</code>
     */
    public static final int METRIC_KIND_UNSPECIFIED_VALUE = 0;
    /**
     * <pre>
     * An instantaneous measurement of a value.
     * </pre>
     *
     * <code>GAUGE = 1;</code>
     */
    public static final int GAUGE_VALUE = 1;
    /**
     * <pre>
     * The change in a value during a time interval.
     * </pre>
     *
     * <code>DELTA = 2;</code>
     */
    public static final int DELTA_VALUE = 2;
    /**
     * <pre>
     * A value accumulated over a time interval.  Cumulative
     * measurements in a time series should have the same start time
     * and increasing end times, until an event resets the cumulative
     * value to zero and sets a new start time for the following
     * points.
     * </pre>
     *
     * <code>CUMULATIVE = 3;</code>
     */
    public static final int CUMULATIVE_VALUE = 3;


    public final int getNumber() {
      if (this == UNRECOGNIZED) {
        throw new java.lang.IllegalArgumentException(
            "Can't get the number of an unknown enum value.");
      }
      return value;
    }

    /**
     * @deprecated Use {@link #forNumber(int)} instead.
     */
    @java.lang.Deprecated
    public static MetricKind valueOf(int value) {
      return forNumber(value);
    }

    public static MetricKind forNumber(int value) {
      switch (value) {
        case 0: return METRIC_KIND_UNSPECIFIED;
        case 1: return GAUGE;
        case 2: return DELTA;
        case 3: return CUMULATIVE;
        default: return null;
      }
    }

    public static com.google.protobuf.Internal.EnumLiteMap<MetricKind>
        internalGetValueMap() {
      return internalValueMap;
    }
    private static final com.google.protobuf.Internal.EnumLiteMap<
        MetricKind> internalValueMap =
          new com.google.protobuf.Internal.EnumLiteMap<MetricKind>() {
            public MetricKind findValueByNumber(int number) {
              return MetricKind.forNumber(number);
            }
          };

    public final com.google.protobuf.Descriptors.EnumValueDescriptor
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      return getDescriptor().getValues().get(ordinal());
    }
    public final com.google.protobuf.Descriptors.EnumDescriptor
        getDescriptorForType() {
      return getDescriptor();
    }
    public static final com.google.protobuf.Descriptors.EnumDescriptor
        getDescriptor() {
      return com.google.api.MetricDescriptor.getDescriptor().getEnumTypes().get(0);
    }

    private static final MetricKind[] VALUES = values();

    public static MetricKind valueOf(
        com.google.protobuf.Descriptors.EnumValueDescriptor desc) {
      if (desc.getType() != getDescriptor()) {
        throw new java.lang.IllegalArgumentException(
          "EnumValueDescriptor is not for this type.");
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        return UNRECOGNIZED;
      }
      return VALUES[desc.getIndex()];
    }

    private final int value;

    private MetricKind(int value) {
      this.value = value;
    }

    // @@protoc_insertion_point(enum_scope:google.api.MetricDescriptor.MetricKind)
  }

  /**
   * <pre>
   * The value type of a metric.
   * </pre>
   *
   * Protobuf enum {@code google.api.MetricDescriptor.ValueType}
   */
  public enum ValueType
      implements com.google.protobuf.ProtocolMessageEnum {
    /**
     * <pre>
     * Do not use this default value.
     * </pre>
     *
     * <code>VALUE_TYPE_UNSPECIFIED = 0;</code>
     */
    VALUE_TYPE_UNSPECIFIED(0),
    /**
     * <pre>
     * The value is a boolean.
     * This value type can be used only if the metric kind is `GAUGE`.
     * </pre>
     *
     * <code>BOOL = 1;</code>
     */
    BOOL(1),
    /**
     * <pre>
     * The value is a signed 64-bit integer.
     * </pre>
     *
     * <code>INT64 = 2;</code>
     */
    INT64(2),
    /**
     * <pre>
     * The value is a double precision floating point number.
     * </pre>
     *
     * <code>DOUBLE = 3;</code>
     */
    DOUBLE(3),
    /**
     * <pre>
     * The value is a text string.
     * This value type can be used only if the metric kind is `GAUGE`.
     * </pre>
     *
     * <code>STRING = 4;</code>
     */
    STRING(4),
    /**
     * <pre>
     * The value is a [`Distribution`][google.api.Distribution].
     * </pre>
     *
     * <code>DISTRIBUTION = 5;</code>
     */
    DISTRIBUTION(5),
    /**
     * <pre>
     * The value is money.
     * </pre>
     *
     * <code>MONEY = 6;</code>
     */
    MONEY(6),
    UNRECOGNIZED(-1),
    ;

    /**
     * <pre>
     * Do not use this default value.
     * </pre>
     *
     * <code>VALUE_TYPE_UNSPECIFIED = 0;</code>
     */
    public static final int VALUE_TYPE_UNSPECIFIED_VALUE = 0;
    /**
     * <pre>
     * The value is a boolean.
     * This value type can be used only if the metric kind is `GAUGE`.
     * </pre>
     *
     * <code>BOOL = 1;</code>
     */
    public static final int BOOL_VALUE = 1;
    /**
     * <pre>
     * The value is a signed 64-bit integer.
     * </pre>
     *
     * <code>INT64 = 2;</code>
     */
    public static final int INT64_VALUE = 2;
    /**
     * <pre>
     * The value is a double precision floating point number.
     * </pre>
     *
     * <code>DOUBLE = 3;</code>
     */
    public static final int DOUBLE_VALUE = 3;
    /**
     * <pre>
     * The value is a text string.
     * This value type can be used only if the metric kind is `GAUGE`.
     * </pre>
     *
     * <code>STRING = 4;</code>
     */
    public static final int STRING_VALUE = 4;
    /**
     * <pre>
     * The value is a [`Distribution`][google.api.Distribution].
     * </pre>
     *
     * <code>DISTRIBUTION = 5;</code>
     */
    public static final int DISTRIBUTION_VALUE = 5;
    /**
     * <pre>
     * The value is money.
     * </pre>
     *
     * <code>MONEY = 6;</code>
     */
    public static final int MONEY_VALUE = 6;


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     */
    @java.lang.Deprecated
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        case 1: return BOOL;
        case 2: return INT64;
        case 3: return DOUBLE;
        case 4: return STRING;
        case 5: return DISTRIBUTION;
        case 6: return MONEY;
        default: return null;
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    public static final com.google.protobuf.Descriptors.EnumDescriptor
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    private static final ValueType[] VALUES = values();

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    // @@protoc_insertion_point(enum_scope:google.api.MetricDescriptor.ValueType)
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  public interface MetricDescriptorMetadataOrBuilder extends
      // @@protoc_insertion_point(interface_extends:google.api.MetricDescriptor.MetricDescriptorMetadata)
      com.google.protobuf.MessageOrBuilder {

    /**
     * <pre>
     * The launch stage of the metric definition.
     * </pre>
     *
     * <code>.google.api.LaunchStage launch_stage = 1;</code>
     */
    int getLaunchStageValue();
    /**
     * <pre>
     * The launch stage of the metric definition.
     * </pre>
     *
     * <code>.google.api.LaunchStage launch_stage = 1;</code>
     */
    com.google.api.LaunchStage getLaunchStage();

    /**
     * <pre>
     * The sampling period of metric data points. For metrics which are written
     * periodically, consecutive data points are stored at this time interval,
     * excluding data loss due to errors. Metrics with a higher granularity have
     * a smaller sampling period.
     * </pre>
     *
     * <code>.google.protobuf.Duration sample_period = 2;</code>
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    /**
     * <pre>
     * The sampling period of metric data points. For metrics which are written
     * periodically, consecutive data points are stored at this time interval,
     * excluding data loss due to errors. Metrics with a higher granularity have
     * a smaller sampling period.
     * </pre>
     *
     * <code>.google.protobuf.Duration sample_period = 2;</code>
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    com.google.protobuf.Duration getSamplePeriod();
    /**
     * <pre>
     * The sampling period of metric data points. For metrics which are written
     * periodically, consecutive data points are stored at this time interval,
     * excluding data loss due to errors. Metrics with a higher granularity have
     * a smaller sampling period.
     * </pre>
     *
     * <code>.google.protobuf.Duration sample_period = 2;</code>
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    com.google.protobuf.DurationOrBuilder getSamplePeriodOrBuilder();

    /**
     * <pre>
     * The delay of data points caused by ingestion. Data points older than this
     * age are guaranteed to be ingested and available to be read, excluding
     * data loss due to errors.
     * </pre>
     *
     * <code>.google.protobuf.Duration ingest_delay = 3;</code>
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    boolean hasIngestDelay();
    /**
     * <pre>
     * The delay of data points caused by ingestion. Data points older than this
     * age are guaranteed to be ingested and available to be read, excluding
     * data loss due to errors.
     * </pre>
     *
     * <code>.google.protobuf.Duration ingest_delay = 3;</code>
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    com.google.protobuf.Duration getIngestDelay();
    /**
     * <pre>
     * The delay of data points caused by ingestion. Data points older than this
     * age are guaranteed to be ingested and available to be read, excluding
     * data loss due to errors.
     * </pre>
     *
     * <code>.google.protobuf.Duration ingest_delay = 3;</code>
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    com.google.protobuf.DurationOrBuilder getIngestDelayOrBuilder();
  }
  /**
   * <pre>
   * Additional annotations that can be used to guide the usage of a metric.
   * </pre>
   *
   * Protobuf type {@code google.api.MetricDescriptor.MetricDescriptorMetadata}
   */
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     * <pre>
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     *
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     * <pre>
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     * The sampling period of metric data points. For metrics which are written
     * periodically, consecutive data points are stored at this time interval,
     * excluding data loss due to errors. Metrics with a higher granularity have
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     * </pre>
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     * </pre>
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          com.google.protobuf.CodedInputStream input,
          com.google.protobuf.ExtensionRegistryLite extensionRegistry)
          throws com.google.protobuf.InvalidProtocolBufferException {
        return new MetricDescriptorMetadata(input, extensionRegistry);
      }
    };

    public static com.google.protobuf.Parser<MetricDescriptorMetadata> parser() {
      return PARSER;
    }

    @java.lang.Override
    public com.google.protobuf.Parser<MetricDescriptorMetadata> getParserForType() {
      return PARSER;
    }

    @java.lang.Override
    public com.google.api.MetricDescriptor.MetricDescriptorMetadata getDefaultInstanceForType() {
      return DEFAULT_INSTANCE;
    }

  }

  private int bitField0_;
  public static final int NAME_FIELD_NUMBER = 1;
  private volatile java.lang.Object name_;
  /**
   * <pre>
   * The resource name of the metric descriptor.
   * </pre>
   *
   * <code>string name = 1;</code>
   */
  public java.lang.String getName() {
    java.lang.Object ref = name_;
    if (ref instanceof java.lang.String) {
      return (java.lang.String) ref;
    } else {
      com.google.protobuf.ByteString bs = 
          (com.google.protobuf.ByteString) ref;
      java.lang.String s = bs.toStringUtf8();
      name_ = s;
      return s;
    }
  }
  /**
   * <pre>
   * The resource name of the metric descriptor.
   * </pre>
   *
   * <code>string name = 1;</code>
   */
  public com.google.protobuf.ByteString
      getNameBytes() {
    java.lang.Object ref = name_;
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      return (com.google.protobuf.ByteString) ref;
    }
  }

  public static final int TYPE_FIELD_NUMBER = 8;
  private volatile java.lang.Object type_;
  /**
   * <pre>
   * The metric type, including its DNS name prefix. The type is not
   * URL-encoded.  All user-defined metric types have the DNS name
   * `custom.googleapis.com` or `external.googleapis.com`.  Metric types should
   * use a natural hierarchical grouping. For example:
   *     "custom.googleapis.com/invoice/paid/amount"
   *     "external.googleapis.com/prometheus/up"
   *     "appengine.googleapis.com/http/server/response_latencies"
   * </pre>
   *
   * <code>string type = 8;</code>
   */
  public java.lang.String getType() {
    java.lang.Object ref = type_;
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      com.google.protobuf.ByteString bs = 
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      java.lang.String s = bs.toStringUtf8();
      type_ = s;
      return s;
    }
  }
  /**
   * <pre>
   * The metric type, including its DNS name prefix. The type is not
   * URL-encoded.  All user-defined metric types have the DNS name
   * `custom.googleapis.com` or `external.googleapis.com`.  Metric types should
   * use a natural hierarchical grouping. For example:
   *     "custom.googleapis.com/invoice/paid/amount"
   *     "external.googleapis.com/prometheus/up"
   *     "appengine.googleapis.com/http/server/response_latencies"
   * </pre>
   *
   * <code>string type = 8;</code>
   */
  public com.google.protobuf.ByteString
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    java.lang.Object ref = type_;
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      type_ = b;
      return b;
    } else {
      return (com.google.protobuf.ByteString) ref;
    }
  }

  public static final int LABELS_FIELD_NUMBER = 2;
  private java.util.List<com.google.api.LabelDescriptor> labels_;
  /**
   * <pre>
   * The set of labels that can be used to describe a specific
   * instance of this metric type. For example, the
   * `appengine.googleapis.com/http/server/response_latencies` metric
   * type has a label for the HTTP response code, `response_code`, so
   * you can look at latencies for successful responses or just
   * for responses that failed.
   * </pre>
   *
   * <code>repeated .google.api.LabelDescriptor labels = 2;</code>
   */
  public java.util.List<com.google.api.LabelDescriptor> getLabelsList() {
    return labels_;
  }
  /**
   * <pre>
   * The set of labels that can be used to describe a specific
   * instance of this metric type. For example, the
   * `appengine.googleapis.com/http/server/response_latencies` metric
   * type has a label for the HTTP response code, `response_code`, so
   * you can look at latencies for successful responses or just
   * for responses that failed.
   * </pre>
   *
   * <code>repeated .google.api.LabelDescriptor labels = 2;</code>
   */
  public java.util.List<? extends com.google.api.LabelDescriptorOrBuilder> 
      getLabelsOrBuilderList() {
    return labels_;
  }
  /**
   * <pre>
   * The set of labels that can be used to describe a specific
   * instance of this metric type. For example, the
   * `appengine.googleapis.com/http/server/response_latencies` metric
   * type has a label for the HTTP response code, `response_code`, so
   * you can look at latencies for successful responses or just
   * for responses that failed.
   * </pre>
   *
   * <code>repeated .google.api.LabelDescriptor labels = 2;</code>
   */
  public int getLabelsCount() {
    return labels_.size();
  }
  /**
   * <pre>
   * The set of labels that can be used to describe a specific
   * instance of this metric type. For example, the
   * `appengine.googleapis.com/http/server/response_latencies` metric
   * type has a label for the HTTP response code, `response_code`, so
   * you can look at latencies for successful responses or just
   * for responses that failed.
   * </pre>
   *
   * <code>repeated .google.api.LabelDescriptor labels = 2;</code>
   */
  public com.google.api.LabelDescriptor getLabels(int index) {
    return labels_.get(index);
  }
  /**
   * <pre>
   * The set of labels that can be used to describe a specific
   * instance of this metric type. For example, the
   * `appengine.googleapis.com/http/server/response_latencies` metric
   * type has a label for the HTTP response code, `response_code`, so
   * you can look at latencies for successful responses or just
   * for responses that failed.
   * </pre>
   *
   * <code>repeated .google.api.LabelDescriptor labels = 2;</code>
   */
  public com.google.api.LabelDescriptorOrBuilder getLabelsOrBuilder(
      int index) {
    return labels_.get(index);
  }

  public static final int METRIC_KIND_FIELD_NUMBER = 3;
  private int metricKind_;
  /**
   * <pre>
   * Whether the metric records instantaneous values, changes to a value, etc.
   * Some combinations of `metric_kind` and `value_type` might not be supported.
   * </pre>
   *
   * <code>.google.api.MetricDescriptor.MetricKind metric_kind = 3;</code>
   */
  public int getMetricKindValue() {
    return metricKind_;
  }
  /**
   * <pre>
   * Whether the metric records instantaneous values, changes to a value, etc.
   * Some combinations of `metric_kind` and `value_type` might not be supported.
   * </pre>
   *
   * <code>.google.api.MetricDescriptor.MetricKind metric_kind = 3;</code>
   */
  public com.google.api.MetricDescriptor.MetricKind getMetricKind() {
    @SuppressWarnings("deprecation")
    com.google.api.MetricDescriptor.MetricKind result = com.google.api.MetricDescriptor.MetricKind.valueOf(metricKind_);
    return result == null ? com.google.api.MetricDescriptor.MetricKind.UNRECOGNIZED : result;
  }

  public static final int VALUE_TYPE_FIELD_NUMBER = 4;
  private int valueType_;
  /**
   * <pre>
   * Whether the measurement is an integer, a floating-point number, etc.
   * Some combinations of `metric_kind` and `value_type` might not be supported.
   * </pre>
   *
   * <code>.google.api.MetricDescriptor.ValueType value_type = 4;</code>
   */
  public int getValueTypeValue() {
    return valueType_;
  }
  /**
   * <pre>
   * Whether the measurement is an integer, a floating-point number, etc.
   * Some combinations of `metric_kind` and `value_type` might not be supported.
   * </pre>
   *
   * <code>.google.api.MetricDescriptor.ValueType value_type = 4;</code>
   */
  public com.google.api.MetricDescriptor.ValueType getValueType() {
    @SuppressWarnings("deprecation")
    com.google.api.MetricDescriptor.ValueType result = com.google.api.MetricDescriptor.ValueType.valueOf(valueType_);
    return result == null ? com.google.api.MetricDescriptor.ValueType.UNRECOGNIZED : result;
  }

  public static final int UNIT_FIELD_NUMBER = 5;
  private volatile java.lang.Object unit_;
  /**
   * <pre>
   * The unit in which the metric value is reported. It is only applicable
   * if the `value_type` is `INT64`, `DOUBLE`, or `DISTRIBUTION`. The
   * supported units are a subset of [The Unified Code for Units of
   * Measure](http://unitsofmeasure.org/ucum.html) standard:
   * **Basic units (UNIT)**
   * * `bit`   bit
   * * `By`    byte
   * * `s`     second
   * * `min`   minute
   * * `h`     hour
   * * `d`     day
   * **Prefixes (PREFIX)**
   * * `k`     kilo    (10**3)
   * * `M`     mega    (10**6)
   * * `G`     giga    (10**9)
   * * `T`     tera    (10**12)
   * * `P`     peta    (10**15)
   * * `E`     exa     (10**18)
   * * `Z`     zetta   (10**21)
   * * `Y`     yotta   (10**24)
   * * `m`     milli   (10**-3)
   * * `u`     micro   (10**-6)
   * * `n`     nano    (10**-9)
   * * `p`     pico    (10**-12)
   * * `f`     femto   (10**-15)
   * * `a`     atto    (10**-18)
   * * `z`     zepto   (10**-21)
   * * `y`     yocto   (10**-24)
   * * `Ki`    kibi    (2**10)
   * * `Mi`    mebi    (2**20)
   * * `Gi`    gibi    (2**30)
   * * `Ti`    tebi    (2**40)
   * **Grammar**
   * The grammar also includes these connectors:
   * * `/`    division (as an infix operator, e.g. `1/s`).
   * * `.`    multiplication (as an infix operator, e.g. `GBy.d`)
   * The grammar for a unit is as follows:
   *     Expression = Component { "." Component } { "/" Component } ;
   *     Component = ( [ PREFIX ] UNIT | "%" ) [ Annotation ]
   *               | Annotation
   *               | "1"
   *               ;
   *     Annotation = "{" NAME "}" ;
   * Notes:
   * * `Annotation` is just a comment if it follows a `UNIT` and is
   *    equivalent to `1` if it is used alone. For examples,
   *    `{requests}/s == 1/s`, `By{transmitted}/s == By/s`.
   * * `NAME` is a sequence of non-blank printable ASCII characters not
   *    containing '{' or '}'.
   * * `1` represents dimensionless value 1, such as in `1/s`.
   * * `%` represents dimensionless value 1/100, and annotates values giving
   *    a percentage.
   * </pre>
   *
   * <code>string unit = 5;</code>
   */
  public java.lang.String getUnit() {
    java.lang.Object ref = unit_;
    if (ref instanceof java.lang.String) {
      return (java.lang.String) ref;
    } else {
      com.google.protobuf.ByteString bs = 
          (com.google.protobuf.ByteString) ref;
      java.lang.String s = bs.toStringUtf8();
      unit_ = s;
      return s;
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  }
  /**
   * <pre>
   * The unit in which the metric value is reported. It is only applicable
   * if the `value_type` is `INT64`, `DOUBLE`, or `DISTRIBUTION`. The
   * supported units are a subset of [The Unified Code for Units of
   * Measure](http://unitsofmeasure.org/ucum.html) standard:
   * **Basic units (UNIT)**
   * * `bit`   bit
   * * `By`    byte
   * * `s`     second
   * * `min`   minute
   * * `h`     hour
   * * `d`     day
   * **Prefixes (PREFIX)**
   * * `k`     kilo    (10**3)
   * * `M`     mega    (10**6)
   * * `G`     giga    (10**9)
   * * `T`     tera    (10**12)
   * * `P`     peta    (10**15)
   * * `E`     exa     (10**18)
   * * `Z`     zetta   (10**21)
   * * `Y`     yotta   (10**24)
   * * `m`     milli   (10**-3)
   * * `u`     micro   (10**-6)
   * * `n`     nano    (10**-9)
   * * `p`     pico    (10**-12)
   * * `f`     femto   (10**-15)
   * * `a`     atto    (10**-18)
   * * `z`     zepto   (10**-21)
   * * `y`     yocto   (10**-24)
   * * `Ki`    kibi    (2**10)
   * * `Mi`    mebi    (2**20)
   * * `Gi`    gibi    (2**30)
   * * `Ti`    tebi    (2**40)
   * **Grammar**
   * The grammar also includes these connectors:
   * * `/`    division (as an infix operator, e.g. `1/s`).
   * * `.`    multiplication (as an infix operator, e.g. `GBy.d`)
   * The grammar for a unit is as follows:
   *     Expression = Component { "." Component } { "/" Component } ;
   *     Component = ( [ PREFIX ] UNIT | "%" ) [ Annotation ]
   *               | Annotation
   *               | "1"
   *               ;
   *     Annotation = "{" NAME "}" ;
   * Notes:
   * * `Annotation` is just a comment if it follows a `UNIT` and is
   *    equivalent to `1` if it is used alone. For examples,
   *    `{requests}/s == 1/s`, `By{transmitted}/s == By/s`.
   * * `NAME` is a sequence of non-blank printable ASCII characters not
   *    containing '{' or '}'.
   * * `1` represents dimensionless value 1, such as in `1/s`.
   * * `%` represents dimensionless value 1/100, and annotates values giving
   *    a percentage.
   * </pre>
   *
   * <code>string unit = 5;</code>
   */
  public com.google.protobuf.ByteString
      getUnitBytes() {
    java.lang.Object ref = unit_;
    if (ref instanceof java.lang.String) {
      com.google.protobuf.ByteString b = 
          com.google.protobuf.ByteString.copyFromUtf8(
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      unit_ = b;
      return b;
    } else {
      return (com.google.protobuf.ByteString) ref;
    }
  }

  public static final int DESCRIPTION_FIELD_NUMBER = 6;
  private volatile java.lang.Object description_;
  /**
   * <pre>
   * A detailed description of the metric, which can be used in documentation.
   * </pre>
   *
   * <code>string description = 6;</code>
   */
  public java.lang.String getDescription() {
    java.lang.Object ref = description_;
    if (ref instanceof java.lang.String) {
      return (java.lang.String) ref;
    } else {
      com.google.protobuf.ByteString bs = 
          (com.google.protobuf.ByteString) ref;
      java.lang.String s = bs.toStringUtf8();
      description_ = s;
      return s;
    }
  }
  /**
   * <pre>
   * A detailed description of the metric, which can be used in documentation.
   * </pre>
   *
   * <code>string description = 6;</code>
   */
  public com.google.protobuf.ByteString
      getDescriptionBytes() {
    java.lang.Object ref = description_;
    if (ref instanceof java.lang.String) {
      com.google.protobuf.ByteString b = 
          com.google.protobuf.ByteString.copyFromUtf8(
              (java.lang.String) ref);
      description_ = b;
      return b;
    } else {
      return (com.google.protobuf.ByteString) ref;
    }
  }

  public static final int DISPLAY_NAME_FIELD_NUMBER = 7;
  private volatile java.lang.Object displayName_;
  /**
   * <pre>
   * A concise name for the metric, which can be displayed in user interfaces.
   * Use sentence case without an ending period, for example "Request count".
   * This field is optional but it is recommended to be set for any metrics
   * associated with user-visible concepts, such as Quota.
   * </pre>
   *
   * <code>string display_name = 7;</code>
   */
  public java.lang.String getDisplayName() {
    java.lang.Object ref = displayName_;
    if (ref instanceof java.lang.String) {
      return (java.lang.String) ref;
    } else {
      com.google.protobuf.ByteString bs = 
          (com.google.protobuf.ByteString) ref;
      java.lang.String s = bs.toStringUtf8();
      displayName_ = s;
      return s;
    }
  }
  /**
   * <pre>
   * A concise name for the metric, which can be displayed in user interfaces.
   * Use sentence case without an ending period, for example "Request count".
   * This field is optional but it is recommended to be set for any metrics
   * associated with user-visible concepts, such as Quota.
   * </pre>
   *
   * <code>string display_name = 7;</code>
   */
  public com.google.protobuf.ByteString
      getDisplayNameBytes() {
    java.lang.Object ref = displayName_;
    if (ref instanceof java.lang.String) {
      com.google.protobuf.ByteString b = 
          com.google.protobuf.ByteString.copyFromUtf8(
              (java.lang.String) ref);
      displayName_ = b;
      return b;
    } else {
      return (com.google.protobuf.ByteString) ref;
    }
  }

  public static final int METADATA_FIELD_NUMBER = 10;
  private com.google.api.MetricDescriptor.MetricDescriptorMetadata metadata_;
  /**
   * <pre>
   * Optional. Metadata which can be used to guide usage of the metric.
   * </pre>
   *
   * <code>.google.api.MetricDescriptor.MetricDescriptorMetadata metadata = 10;</code>
   */
  public boolean hasMetadata() {
    return metadata_ != null;
  }
  /**
   * <pre>
   * Optional. Metadata which can be used to guide usage of the metric.
   * </pre>
   *
   * <code>.google.api.MetricDescriptor.MetricDescriptorMetadata metadata = 10;</code>
   */
  public com.google.api.MetricDescriptor.MetricDescriptorMetadata getMetadata() {
    return metadata_ == null ? com.google.api.MetricDescriptor.MetricDescriptorMetadata.getDefaultInstance() : metadata_;
  }
  /**
   * <pre>
   * Optional. Metadata which can be used to guide usage of the metric.
   * </pre>
   *
   * <code>.google.api.MetricDescriptor.MetricDescriptorMetadata metadata = 10;</code>
   */
  public com.google.api.MetricDescriptor.MetricDescriptorMetadataOrBuilder getMetadataOrBuilder() {
    return getMetadata();
  }

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  public static com.google.api.MetricDescriptor parseFrom(
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      throws com.google.protobuf.InvalidProtocolBufferException {
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     * <pre>
     * The set of labels that can be used to describe a specific
     * instance of this metric type. For example, the
     * `appengine.googleapis.com/http/server/response_latencies` metric
     * type has a label for the HTTP response code, `response_code`, so
     * you can look at latencies for successful responses or just
     * for responses that failed.
     * </pre>
     *
     * <code>repeated .google.api.LabelDescriptor labels = 2;</code>
     */
    public Builder removeLabels(int index) {
      if (labelsBuilder_ == null) {
        ensureLabelsIsMutable();
        labels_.remove(index);
        onChanged();
      } else {
        labelsBuilder_.remove(index);
      }
      return this;
    }
    /**
     * <pre>
     * The set of labels that can be used to describe a specific
     * instance of this metric type. For example, the
     * `appengine.googleapis.com/http/server/response_latencies` metric
     * type has a label for the HTTP response code, `response_code`, so
     * you can look at latencies for successful responses or just
     * for responses that failed.
     * </pre>
     *
     * <code>repeated .google.api.LabelDescriptor labels = 2;</code>
     */
    public com.google.api.LabelDescriptor.Builder getLabelsBuilder(
        int index) {
      return getLabelsFieldBuilder().getBuilder(index);
    }
    /**
     * <pre>
     * The set of labels that can be used to describe a specific
     * instance of this metric type. For example, the
     * `appengine.googleapis.com/http/server/response_latencies` metric
     * type has a label for the HTTP response code, `response_code`, so
     * you can look at latencies for successful responses or just
     * for responses that failed.
     * </pre>
     *
     * <code>repeated .google.api.LabelDescriptor labels = 2;</code>
     */
    public com.google.api.LabelDescriptorOrBuilder getLabelsOrBuilder(
        int index) {
      if (labelsBuilder_ == null) {
        return labels_.get(index);  } else {
        return labelsBuilder_.getMessageOrBuilder(index);
      }
    }
    /**
     * <pre>
     * The set of labels that can be used to describe a specific
     * instance of this metric type. For example, the
     * `appengine.googleapis.com/http/server/response_latencies` metric
     * type has a label for the HTTP response code, `response_code`, so
     * you can look at latencies for successful responses or just
     * for responses that failed.
     * </pre>
     *
     * <code>repeated .google.api.LabelDescriptor labels = 2;</code>
     */
    public java.util.List<? extends com.google.api.LabelDescriptorOrBuilder> 
         getLabelsOrBuilderList() {
      if (labelsBuilder_ != null) {
        return labelsBuilder_.getMessageOrBuilderList();
      } else {
        return java.util.Collections.unmodifiableList(labels_);
      }
    }
    /**
     * <pre>
     * The set of labels that can be used to describe a specific
     * instance of this metric type. For example, the
     * `appengine.googleapis.com/http/server/response_latencies` metric
     * type has a label for the HTTP response code, `response_code`, so
     * you can look at latencies for successful responses or just
     * for responses that failed.
     * </pre>
     *
     * <code>repeated .google.api.LabelDescriptor labels = 2;</code>
     */
    public com.google.api.LabelDescriptor.Builder addLabelsBuilder() {
      return getLabelsFieldBuilder().addBuilder(
          com.google.api.LabelDescriptor.getDefaultInstance());
    }
    /**
     * <pre>
     * The set of labels that can be used to describe a specific
     * instance of this metric type. For example, the
     * `appengine.googleapis.com/http/server/response_latencies` metric
     * type has a label for the HTTP response code, `response_code`, so
     * you can look at latencies for successful responses or just
     * for responses that failed.
     * </pre>
     *
     * <code>repeated .google.api.LabelDescriptor labels = 2;</code>
     */
    public com.google.api.LabelDescriptor.Builder addLabelsBuilder(
        int index) {
      return getLabelsFieldBuilder().addBuilder(
          index, com.google.api.LabelDescriptor.getDefaultInstance());
    }
    /**
     * <pre>
     * The set of labels that can be used to describe a specific
     * instance of this metric type. For example, the
     * `appengine.googleapis.com/http/server/response_latencies` metric
     * type has a label for the HTTP response code, `response_code`, so
     * you can look at latencies for successful responses or just
     * for responses that failed.
     * </pre>
     *
     * <code>repeated .google.api.LabelDescriptor labels = 2;</code>
     */
    public java.util.List<com.google.api.LabelDescriptor.Builder> 
         getLabelsBuilderList() {
      return getLabelsFieldBuilder().getBuilderList();
    }
    private com.google.protobuf.RepeatedFieldBuilderV3<
        com.google.api.LabelDescriptor, com.google.api.LabelDescriptor.Builder, com.google.api.LabelDescriptorOrBuilder> 
        getLabelsFieldBuilder() {
      if (labelsBuilder_ == null) {
        labelsBuilder_ = new com.google.protobuf.RepeatedFieldBuilderV3<
            com.google.api.LabelDescriptor, com.google.api.LabelDescriptor.Builder, com.google.api.LabelDescriptorOrBuilder>(
                labels_,
                ((bitField0_ & 0x00000004) != 0),
                getParentForChildren(),
                isClean());
        labels_ = null;
      }
      return labelsBuilder_;
    }

    private int metricKind_ = 0;
    /**
     * <pre>
     * Whether the metric records instantaneous values, changes to a value, etc.
     * Some combinations of `metric_kind` and `value_type` might not be supported.
     * </pre>
     *
     * <code>.google.api.MetricDescriptor.MetricKind metric_kind = 3;</code>
     */
    public int getMetricKindValue() {
      return metricKind_;
    }
    /**
     * <pre>
     * Whether the metric records instantaneous values, changes to a value, etc.
     * Some combinations of `metric_kind` and `value_type` might not be supported.
     * </pre>
     *
     * <code>.google.api.MetricDescriptor.MetricKind metric_kind = 3;</code>
     */
    public Builder setMetricKindValue(int value) {
      metricKind_ = value;
      onChanged();
      return this;
    }
    /**
     * <pre>
     * Whether the metric records instantaneous values, changes to a value, etc.
     * Some combinations of `metric_kind` and `value_type` might not be supported.
     * </pre>
     *
     * <code>.google.api.MetricDescriptor.MetricKind metric_kind = 3;</code>
     */
    public com.google.api.MetricDescriptor.MetricKind getMetricKind() {
      @SuppressWarnings("deprecation")
      com.google.api.MetricDescriptor.MetricKind result = com.google.api.MetricDescriptor.MetricKind.valueOf(metricKind_);
      return result == null ? com.google.api.MetricDescriptor.MetricKind.UNRECOGNIZED : result;
    }
    /**
     * <pre>
     * Whether the metric records instantaneous values, changes to a value, etc.
     * Some combinations of `metric_kind` and `value_type` might not be supported.
     * </pre>
     *
     * <code>.google.api.MetricDescriptor.MetricKind metric_kind = 3;</code>
     */
    public Builder setMetricKind(com.google.api.MetricDescriptor.MetricKind value) {
      if (value == null) {
        throw new NullPointerException();
      }
      
      metricKind_ = value.getNumber();
      onChanged();
      return this;
    }
    /**
     * <pre>
     * Whether the metric records instantaneous values, changes to a value, etc.
     * Some combinations of `metric_kind` and `value_type` might not be supported.
     * </pre>
     *
     * <code>.google.api.MetricDescriptor.MetricKind metric_kind = 3;</code>
     */
    public Builder clearMetricKind() {
      
      metricKind_ = 0;
      onChanged();
      return this;
    }

    private int valueType_ = 0;
    /**
     * <pre>
     * Whether the measurement is an integer, a floating-point number, etc.
     * Some combinations of `metric_kind` and `value_type` might not be supported.
     * </pre>
     *
     * <code>.google.api.MetricDescriptor.ValueType value_type = 4;</code>
     */
    public int getValueTypeValue() {
      return valueType_;
    }
    /**
     * <pre>
     * Whether the measurement is an integer, a floating-point number, etc.
     * Some combinations of `metric_kind` and `value_type` might not be supported.
     * </pre>
     *
     * <code>.google.api.MetricDescriptor.ValueType value_type = 4;</code>
     */
    public Builder setValueTypeValue(int value) {
      valueType_ = value;
      onChanged();
      return this;
    }
    /**
     * <pre>
     * Whether the measurement is an integer, a floating-point number, etc.
     * Some combinations of `metric_kind` and `value_type` might not be supported.
     * </pre>
     *
     * <code>.google.api.MetricDescriptor.ValueType value_type = 4;</code>
     */
    public com.google.api.MetricDescriptor.ValueType getValueType() {
      @SuppressWarnings("deprecation")
      com.google.api.MetricDescriptor.ValueType result = com.google.api.MetricDescriptor.ValueType.valueOf(valueType_);
      return result == null ? com.google.api.MetricDescriptor.ValueType.UNRECOGNIZED : result;
    }
    /**
     * <pre>
     * Whether the measurement is an integer, a floating-point number, etc.
     * Some combinations of `metric_kind` and `value_type` might not be supported.
     * </pre>
     *
     * <code>.google.api.MetricDescriptor.ValueType value_type = 4;</code>
     */
    public Builder setValueType(com.google.api.MetricDescriptor.ValueType value) {
      if (value == null) {
        throw new NullPointerException();
      }
      
      valueType_ = value.getNumber();
      onChanged();
      return this;
    }
    /**
     * <pre>
     * Whether the measurement is an integer, a floating-point number, etc.
     * Some combinations of `metric_kind` and `value_type` might not be supported.
     * </pre>
     *
     * <code>.google.api.MetricDescriptor.ValueType value_type = 4;</code>
     */
    public Builder clearValueType() {
      
      valueType_ = 0;
      onChanged();
      return this;
    }

    private java.lang.Object unit_ = "";
    /**
     * <pre>
     * The unit in which the metric value is reported. It is only applicable
     * if the `value_type` is `INT64`, `DOUBLE`, or `DISTRIBUTION`. The
     * supported units are a subset of [The Unified Code for Units of
     * Measure](http://unitsofmeasure.org/ucum.html) standard:
     * **Basic units (UNIT)**
     * * `bit`   bit
     * * `By`    byte
     * * `s`     second
     * * `min`   minute
     * * `h`     hour
     * * `d`     day
     * **Prefixes (PREFIX)**
     * * `k`     kilo    (10**3)
     * * `M`     mega    (10**6)
     * * `G`     giga    (10**9)
     * * `T`     tera    (10**12)
     * * `P`     peta    (10**15)
     * * `E`     exa     (10**18)
     * * `Z`     zetta   (10**21)
     * * `Y`     yotta   (10**24)
     * * `m`     milli   (10**-3)
     * * `u`     micro   (10**-6)
     * * `n`     nano    (10**-9)
     * * `p`     pico    (10**-12)
     * * `f`     femto   (10**-15)
     * * `a`     atto    (10**-18)
     * * `z`     zepto   (10**-21)
     * * `y`     yocto   (10**-24)
     * * `Ki`    kibi    (2**10)
     * * `Mi`    mebi    (2**20)
     * * `Gi`    gibi    (2**30)
     * * `Ti`    tebi    (2**40)
     * **Grammar**
     * The grammar also includes these connectors:
     * * `/`    division (as an infix operator, e.g. `1/s`).
     * * `.`    multiplication (as an infix operator, e.g. `GBy.d`)
     * The grammar for a unit is as follows:
     *     Expression = Component { "." Component } { "/" Component } ;
     *     Component = ( [ PREFIX ] UNIT | "%" ) [ Annotation ]
     *               | Annotation
     *               | "1"
     *               ;
     *     Annotation = "{" NAME "}" ;
     * Notes:
     * * `Annotation` is just a comment if it follows a `UNIT` and is
     *    equivalent to `1` if it is used alone. For examples,
     *    `{requests}/s == 1/s`, `By{transmitted}/s == By/s`.
     * * `NAME` is a sequence of non-blank printable ASCII characters not
     *    containing '{' or '}'.
     * * `1` represents dimensionless value 1, such as in `1/s`.
     * * `%` represents dimensionless value 1/100, and annotates values giving
     *    a percentage.
     * </pre>
     *
     * <code>string unit = 5;</code>
     */
    public java.lang.String getUnit() {
      java.lang.Object ref = unit_;
      if (!(ref instanceof java.lang.String)) {
        com.google.protobuf.ByteString bs =
            (com.google.protobuf.ByteString) ref;
        java.lang.String s = bs.toStringUtf8();
        unit_ = s;
        return s;
      } else {
        return (java.lang.String) ref;
      }
    }
    /**
     * <pre>
     * The unit in which the metric value is reported. It is only applicable
     * if the `value_type` is `INT64`, `DOUBLE`, or `DISTRIBUTION`. The
     * supported units are a subset of [The Unified Code for Units of
     * Measure](http://unitsofmeasure.org/ucum.html) standard:
     * **Basic units (UNIT)**
     * * `bit`   bit
     * * `By`    byte
     * * `s`     second
     * * `min`   minute
     * * `h`     hour
     * * `d`     day
     * **Prefixes (PREFIX)**
     * * `k`     kilo    (10**3)
     * * `M`     mega    (10**6)
     * * `G`     giga    (10**9)
     * * `T`     tera    (10**12)
     * * `P`     peta    (10**15)
     * * `E`     exa     (10**18)
     * * `Z`     zetta   (10**21)
     * * `Y`     yotta   (10**24)
     * * `m`     milli   (10**-3)
     * * `u`     micro   (10**-6)
     * * `n`     nano    (10**-9)
     * * `p`     pico    (10**-12)
     * * `f`     femto   (10**-15)
     * * `a`     atto    (10**-18)
     * * `z`     zepto   (10**-21)
     * * `y`     yocto   (10**-24)
     * * `Ki`    kibi    (2**10)
     * * `Mi`    mebi    (2**20)
     * * `Gi`    gibi    (2**30)
     * * `Ti`    tebi    (2**40)
     * **Grammar**
     * The grammar also includes these connectors:
     * * `/`    division (as an infix operator, e.g. `1/s`).
     * * `.`    multiplication (as an infix operator, e.g. `GBy.d`)
     * The grammar for a unit is as follows:
     *     Expression = Component { "." Component } { "/" Component } ;
     *     Component = ( [ PREFIX ] UNIT | "%" ) [ Annotation ]
     *               | Annotation
     *               | "1"
     *               ;
     *     Annotation = "{" NAME "}" ;
     * Notes:
     * * `Annotation` is just a comment if it follows a `UNIT` and is
     *    equivalent to `1` if it is used alone. For examples,
     *    `{requests}/s == 1/s`, `By{transmitted}/s == By/s`.
     * * `NAME` is a sequence of non-blank printable ASCII characters not
     *    containing '{' or '}'.
     * * `1` represents dimensionless value 1, such as in `1/s`.
     * * `%` represents dimensionless value 1/100, and annotates values giving
     *    a percentage.
     * </pre>
     *
     * <code>string unit = 5;</code>
     */
    public com.google.protobuf.ByteString
        getUnitBytes() {
      java.lang.Object ref = unit_;
      if (ref instanceof String) {
        com.google.protobuf.ByteString b = 
            com.google.protobuf.ByteString.copyFromUtf8(
                (java.lang.String) ref);
        unit_ = b;
        return b;
      } else {
        return (com.google.protobuf.ByteString) ref;
      }
    }
    /**
     * <pre>
     * The unit in which the metric value is reported. It is only applicable
     * if the `value_type` is `INT64`, `DOUBLE`, or `DISTRIBUTION`. The
     * supported units are a subset of [The Unified Code for Units of
     * Measure](http://unitsofmeasure.org/ucum.html) standard:
     * **Basic units (UNIT)**
     * * `bit`   bit
     * * `By`    byte
     * * `s`     second
     * * `min`   minute
     * * `h`     hour
     * * `d`     day
     * **Prefixes (PREFIX)**
     * * `k`     kilo    (10**3)
     * * `M`     mega    (10**6)
     * * `G`     giga    (10**9)
     * * `T`     tera    (10**12)
     * * `P`     peta    (10**15)
     * * `E`     exa     (10**18)
     * * `Z`     zetta   (10**21)
     * * `Y`     yotta   (10**24)
     * * `m`     milli   (10**-3)
     * * `u`     micro   (10**-6)
     * * `n`     nano    (10**-9)
     * * `p`     pico    (10**-12)
     * * `f`     femto   (10**-15)
     * * `a`     atto    (10**-18)
     * * `z`     zepto   (10**-21)
     * * `y`     yocto   (10**-24)
     * * `Ki`    kibi    (2**10)
     * * `Mi`    mebi    (2**20)
     * * `Gi`    gibi    (2**30)
     * * `Ti`    tebi    (2**40)
     * **Grammar**
     * The grammar also includes these connectors:
     * * `/`    division (as an infix operator, e.g. `1/s`).
     * * `.`    multiplication (as an infix operator, e.g. `GBy.d`)
     * The grammar for a unit is as follows:
     *     Expression = Component { "." Component } { "/" Component } ;
     *     Component = ( [ PREFIX ] UNIT | "%" ) [ Annotation ]
     *               | Annotation
     *               | "1"
     *               ;
     *     Annotation = "{" NAME "}" ;
     * Notes:
     * * `Annotation` is just a comment if it follows a `UNIT` and is
     *    equivalent to `1` if it is used alone. For examples,
     *    `{requests}/s == 1/s`, `By{transmitted}/s == By/s`.
     * * `NAME` is a sequence of non-blank printable ASCII characters not
     *    containing '{' or '}'.
     * * `1` represents dimensionless value 1, such as in `1/s`.
     * * `%` represents dimensionless value 1/100, and annotates values giving
     *    a percentage.
     * </pre>
     *
     * <code>string unit = 5;</code>
     */
    public Builder setUnit(
        java.lang.String value) {
      if (value == null) {
    throw new NullPointerException();
  }
  
      unit_ = value;
      onChanged();
      return this;
    }
    /**
     * <pre>
     * The unit in which the metric value is reported. It is only applicable
     * if the `value_type` is `INT64`, `DOUBLE`, or `DISTRIBUTION`. The
     * supported units are a subset of [The Unified Code for Units of
     * Measure](http://unitsofmeasure.org/ucum.html) standard:
     * **Basic units (UNIT)**
     * * `bit`   bit
     * * `By`    byte
     * * `s`     second
     * * `min`   minute
     * * `h`     hour
     * * `d`     day
     * **Prefixes (PREFIX)**
     * * `k`     kilo    (10**3)
     * * `M`     mega    (10**6)
     * * `G`     giga    (10**9)
     * * `T`     tera    (10**12)
     * * `P`     peta    (10**15)
     * * `E`     exa     (10**18)
     * * `Z`     zetta   (10**21)
     * * `Y`     yotta   (10**24)
     * * `m`     milli   (10**-3)
     * * `u`     micro   (10**-6)
     * * `n`     nano    (10**-9)
     * * `p`     pico    (10**-12)
     * * `f`     femto   (10**-15)
     * * `a`     atto    (10**-18)
     * * `z`     zepto   (10**-21)
     * * `y`     yocto   (10**-24)
     * * `Ki`    kibi    (2**10)
     * * `Mi`    mebi    (2**20)
     * * `Gi`    gibi    (2**30)
     * * `Ti`    tebi    (2**40)
     * **Grammar**
     * The grammar also includes these connectors:
     * * `/`    division (as an infix operator, e.g. `1/s`).
     * * `.`    multiplication (as an infix operator, e.g. `GBy.d`)
     * The grammar for a unit is as follows:
     *     Expression = Component { "." Component } { "/" Component } ;
     *     Component = ( [ PREFIX ] UNIT | "%" ) [ Annotation ]
     *               | Annotation
     *               | "1"
     *               ;
     *     Annotation = "{" NAME "}" ;
     * Notes:
     * * `Annotation` is just a comment if it follows a `UNIT` and is
     *    equivalent to `1` if it is used alone. For examples,
     *    `{requests}/s == 1/s`, `By{transmitted}/s == By/s`.
     * * `NAME` is a sequence of non-blank printable ASCII characters not
     *    containing '{' or '}'.
     * * `1` represents dimensionless value 1, such as in `1/s`.
     * * `%` represents dimensionless value 1/100, and annotates values giving
     *    a percentage.
     * </pre>
     *
     * <code>string unit = 5;</code>
     */
    public Builder clearUnit() {
      
      unit_ = getDefaultInstance().getUnit();
      onChanged();
      return this;
    }
    /**
     * <pre>
     * The unit in which the metric value is reported. It is only applicable
     * if the `value_type` is `INT64`, `DOUBLE`, or `DISTRIBUTION`. The
     * supported units are a subset of [The Unified Code for Units of
     * Measure](http://unitsofmeasure.org/ucum.html) standard:
     * **Basic units (UNIT)**
     * * `bit`   bit
     * * `By`    byte
     * * `s`     second
     * * `min`   minute
     * * `h`     hour
     * * `d`     day
     * **Prefixes (PREFIX)**
     * * `k`     kilo    (10**3)
     * * `M`     mega    (10**6)
     * * `G`     giga    (10**9)
     * * `T`     tera    (10**12)
     * * `P`     peta    (10**15)
     * * `E`     exa     (10**18)
     * * `Z`     zetta   (10**21)
     * * `Y`     yotta   (10**24)
     * * `m`     milli   (10**-3)
     * * `u`     micro   (10**-6)
     * * `n`     nano    (10**-9)
     * * `p`     pico    (10**-12)
     * * `f`     femto   (10**-15)
     * * `a`     atto    (10**-18)
     * * `z`     zepto   (10**-21)
     * * `y`     yocto   (10**-24)
     * * `Ki`    kibi    (2**10)
     * * `Mi`    mebi    (2**20)
     * * `Gi`    gibi    (2**30)
     * * `Ti`    tebi    (2**40)
     * **Grammar**
     * The grammar also includes these connectors:
     * * `/`    division (as an infix operator, e.g. `1/s`).
     * * `.`    multiplication (as an infix operator, e.g. `GBy.d`)
     * The grammar for a unit is as follows:
     *     Expression = Component { "." Component } { "/" Component } ;
     *     Component = ( [ PREFIX ] UNIT | "%" ) [ Annotation ]
     *               | Annotation
     *               | "1"
     *               ;
     *     Annotation = "{" NAME "}" ;
     * Notes:
     * * `Annotation` is just a comment if it follows a `UNIT` and is
     *    equivalent to `1` if it is used alone. For examples,
     *    `{requests}/s == 1/s`, `By{transmitted}/s == By/s`.
     * * `NAME` is a sequence of non-blank printable ASCII characters not
     *    containing '{' or '}'.
     * * `1` represents dimensionless value 1, such as in `1/s`.
     * * `%` represents dimensionless value 1/100, and annotates values giving
     *    a percentage.
     * </pre>
     *
     * <code>string unit = 5;</code>
     */
    public Builder setUnitBytes(
        com.google.protobuf.ByteString value) {
      if (value == null) {
    throw new NullPointerException();
  }
  checkByteStringIsUtf8(value);
      
      unit_ = value;
      onChanged();
      return this;
    }

    private java.lang.Object description_ = "";
    /**
     * <pre>
     * A detailed description of the metric, which can be used in documentation.
     * </pre>
     *
     * <code>string description = 6;</code>
     */
    public java.lang.String getDescription() {
      java.lang.Object ref = description_;
      if (!(ref instanceof java.lang.String)) {
        com.google.protobuf.ByteString bs =
            (com.google.protobuf.ByteString) ref;
        java.lang.String s = bs.toStringUtf8();
        description_ = s;
        return s;
      } else {
        return (java.lang.String) ref;
      }
    }
    /**
     * <pre>
     * A detailed description of the metric, which can be used in documentation.
     * </pre>
     *
     * <code>string description = 6;</code>
     */
    public com.google.protobuf.ByteString
        getDescriptionBytes() {
      java.lang.Object ref = description_;
      if (ref instanceof String) {
        com.google.protobuf.ByteString b = 
            com.google.protobuf.ByteString.copyFromUtf8(
                (java.lang.String) ref);
        description_ = b;
        return b;
      } else {
        return (com.google.protobuf.ByteString) ref;
      }
    }
    /**
     * <pre>
     * A detailed description of the metric, which can be used in documentation.
     * </pre>
     *
     * <code>string description = 6;</code>
     */
    public Builder setDescription(
        java.lang.String value) {
      if (value == null) {
    throw new NullPointerException();
  }
  
      description_ = value;
      onChanged();
      return this;
    }
    /**
     * <pre>
     * A detailed description of the metric, which can be used in documentation.
     * </pre>
     *
     * <code>string description = 6;</code>
     */
    public Builder clearDescription() {
      
      description_ = getDefaultInstance().getDescription();
      onChanged();
      return this;
    }
    /**
     * <pre>
     * A detailed description of the metric, which can be used in documentation.
     * </pre>
     *
     * <code>string description = 6;</code>
     */
    public Builder setDescriptionBytes(
        com.google.protobuf.ByteString value) {
      if (value == null) {
    throw new NullPointerException();
  }
  checkByteStringIsUtf8(value);
      
      description_ = value;
      onChanged();
      return this;
    }

    private java.lang.Object displayName_ = "";
    /**
     * <pre>
     * A concise name for the metric, which can be displayed in user interfaces.
     * Use sentence case without an ending period, for example "Request count".
     * This field is optional but it is recommended to be set for any metrics
     * associated with user-visible concepts, such as Quota.
     * </pre>
     *
     * <code>string display_name = 7;</code>
     */
    public java.lang.String getDisplayName() {
      java.lang.Object ref = displayName_;
      if (!(ref instanceof java.lang.String)) {
        com.google.protobuf.ByteString bs =
            (com.google.protobuf.ByteString) ref;
        java.lang.String s = bs.toStringUtf8();
        displayName_ = s;
        return s;
      } else {
        return (java.lang.String) ref;
      }
    }
    /**
     * <pre>
     * A concise name for the metric, which can be displayed in user interfaces.
     * Use sentence case without an ending period, for example "Request count".
     * This field is optional but it is recommended to be set for any metrics
     * associated with user-visible concepts, such as Quota.
     * </pre>
     *
     * <code>string display_name = 7;</code>
     */
    public com.google.protobuf.ByteString
        getDisplayNameBytes() {
      java.lang.Object ref = displayName_;
      if (ref instanceof String) {
        com.google.protobuf.ByteString b = 
            com.google.protobuf.ByteString.copyFromUtf8(
                (java.lang.String) ref);
        displayName_ = b;
        return b;
      } else {
        return (com.google.protobuf.ByteString) ref;
      }
    }
    /**
     * <pre>
     * A concise name for the metric, which can be displayed in user interfaces.
     * Use sentence case without an ending period, for example "Request count".
     * This field is optional but it is recommended to be set for any metrics
     * associated with user-visible concepts, such as Quota.
     * </pre>
     *
     * <code>string display_name = 7;</code>
     */
    public Builder setDisplayName(
        java.lang.String value) {
      if (value == null) {
    throw new NullPointerException();
  }
  
      displayName_ = value;
      onChanged();
      return this;
    }
    /**
     * <pre>
     * A concise name for the metric, which can be displayed in user interfaces.
     * Use sentence case without an ending period, for example "Request count".
     * This field is optional but it is recommended to be set for any metrics
     * associated with user-visible concepts, such as Quota.
     * </pre>
     *
     * <code>string display_name = 7;</code>
     */
    public Builder clearDisplayName() {
      
      displayName_ = getDefaultInstance().getDisplayName();
      onChanged();
      return this;
    }
    /**
     * <pre>
     * A concise name for the metric, which can be displayed in user interfaces.
     * Use sentence case without an ending period, for example "Request count".
     * This field is optional but it is recommended to be set for any metrics
     * associated with user-visible concepts, such as Quota.
     * </pre>
     *
     * <code>string display_name = 7;</code>
     */
    public Builder setDisplayNameBytes(
        com.google.protobuf.ByteString value) {
      if (value == null) {
    throw new NullPointerException();
  }
  checkByteStringIsUtf8(value);
      
      displayName_ = value;
      onChanged();
      return this;
    }

    private com.google.api.MetricDescriptor.MetricDescriptorMetadata metadata_;
    private com.google.protobuf.SingleFieldBuilderV3<
        com.google.api.MetricDescriptor.MetricDescriptorMetadata, com.google.api.MetricDescriptor.MetricDescriptorMetadata.Builder, com.google.api.MetricDescriptor.MetricDescriptorMetadataOrBuilder> metadataBuilder_;
    /**
     * <pre>
     * Optional. Metadata which can be used to guide usage of the metric.
     * </pre>
     *
     * <code>.google.api.MetricDescriptor.MetricDescriptorMetadata metadata = 10;</code>
     */
    public boolean hasMetadata() {
      return metadataBuilder_ != null || metadata_ != null;
    }
    /**
     * <pre>
     * Optional. Metadata which can be used to guide usage of the metric.
     * </pre>
     *
     * <code>.google.api.MetricDescriptor.MetricDescriptorMetadata metadata = 10;</code>
     */
    public com.google.api.MetricDescriptor.MetricDescriptorMetadata getMetadata() {
      if (metadataBuilder_ == null) {
        return metadata_ == null ? com.google.api.MetricDescriptor.MetricDescriptorMetadata.getDefaultInstance() : metadata_;
      } else {
        return metadataBuilder_.getMessage();
      }
    }
    /**
     * <pre>
     * Optional. Metadata which can be used to guide usage of the metric.
     * </pre>
     *
     * <code>.google.api.MetricDescriptor.MetricDescriptorMetadata metadata = 10;</code>
     */
    public Builder setMetadata(com.google.api.MetricDescriptor.MetricDescriptorMetadata value) {
      if (metadataBuilder_ == null) {
        if (value == null) {
          throw new NullPointerException();
        }
        metadata_ = value;
        onChanged();
      } else {
        metadataBuilder_.setMessage(value);
      }

      return this;
    }
    /**
     * <pre>
     * Optional. Metadata which can be used to guide usage of the metric.
     * </pre>
     *
     * <code>.google.api.MetricDescriptor.MetricDescriptorMetadata metadata = 10;</code>
     */
    public Builder setMetadata(
        com.google.api.MetricDescriptor.MetricDescriptorMetadata.Builder builderForValue) {
      if (metadataBuilder_ == null) {
        metadata_ = builderForValue.build();
        onChanged();
      } else {
        metadataBuilder_.setMessage(builderForValue.build());
      }

      return this;
    }
    /**
     * <pre>
     * Optional. Metadata which can be used to guide usage of the metric.
     * </pre>
     *
     * <code>.google.api.MetricDescriptor.MetricDescriptorMetadata metadata = 10;</code>
     */
    public Builder mergeMetadata(com.google.api.MetricDescriptor.MetricDescriptorMetadata value) {
      if (metadataBuilder_ == null) {
        if (metadata_ != null) {
          metadata_ =
            com.google.api.MetricDescriptor.MetricDescriptorMetadata.newBuilder(metadata_).mergeFrom(value).buildPartial();
        } else {
          metadata_ = value;
        }
        onChanged();
      } else {
        metadataBuilder_.mergeFrom(value);
      }

      return this;
    }
    /**
     * <pre>
     * Optional. Metadata which can be used to guide usage of the metric.
     * </pre>
     *
     * <code>.google.api.MetricDescriptor.MetricDescriptorMetadata metadata = 10;</code>
     */
    public Builder clearMetadata() {
      if (metadataBuilder_ == null) {
        metadata_ = null;
        onChanged();
      } else {
        metadata_ = null;
        metadataBuilder_ = null;
      }

      return this;
    }
    /**
     * <pre>
     * Optional. Metadata which can be used to guide usage of the metric.
     * </pre>
     *
     * <code>.google.api.MetricDescriptor.MetricDescriptorMetadata metadata = 10;</code>
     */
    public com.google.api.MetricDescriptor.MetricDescriptorMetadata.Builder getMetadataBuilder() {
      
      onChanged();
      return getMetadataFieldBuilder().getBuilder();
    }
    /**
     * <pre>
     * Optional. Metadata which can be used to guide usage of the metric.
     * </pre>
     *
     * <code>.google.api.MetricDescriptor.MetricDescriptorMetadata metadata = 10;</code>
     */
    public com.google.api.MetricDescriptor.MetricDescriptorMetadataOrBuilder getMetadataOrBuilder() {
      if (metadataBuilder_ != null) {
        return metadataBuilder_.getMessageOrBuilder();
      } else {
        return metadata_ == null ?
            com.google.api.MetricDescriptor.MetricDescriptorMetadata.getDefaultInstance() : metadata_;
      }
    }
    /**
     * <pre>
     * Optional. Metadata which can be used to guide usage of the metric.
     * </pre>
     *
     * <code>.google.api.MetricDescriptor.MetricDescriptorMetadata metadata = 10;</code>
     */
    private com.google.protobuf.SingleFieldBuilderV3<
        com.google.api.MetricDescriptor.MetricDescriptorMetadata, com.google.api.MetricDescriptor.MetricDescriptorMetadata.Builder, com.google.api.MetricDescriptor.MetricDescriptorMetadataOrBuilder> 
        getMetadataFieldBuilder() {
      if (metadataBuilder_ == null) {
        metadataBuilder_ = new com.google.protobuf.SingleFieldBuilderV3<
            com.google.api.MetricDescriptor.MetricDescriptorMetadata, com.google.api.MetricDescriptor.MetricDescriptorMetadata.Builder, com.google.api.MetricDescriptor.MetricDescriptorMetadataOrBuilder>(
                getMetadata(),
                getParentForChildren(),
                isClean());
        metadata_ = null;
      }
      return metadataBuilder_;
    }
    @java.lang.Override
    public final Builder setUnknownFields(
        final com.google.protobuf.UnknownFieldSet unknownFields) {
      return super.setUnknownFields(unknownFields);
    }

    @java.lang.Override
    public final Builder mergeUnknownFields(
        final com.google.protobuf.UnknownFieldSet unknownFields) {
      return super.mergeUnknownFields(unknownFields);
    }


    // @@protoc_insertion_point(builder_scope:google.api.MetricDescriptor)
  }

  // @@protoc_insertion_point(class_scope:google.api.MetricDescriptor)
  private static final com.google.api.MetricDescriptor DEFAULT_INSTANCE;
  static {
    DEFAULT_INSTANCE = new com.google.api.MetricDescriptor();
  }

  public static com.google.api.MetricDescriptor getDefaultInstance() {
    return DEFAULT_INSTANCE;
  }

  private static final com.google.protobuf.Parser<MetricDescriptor>
      PARSER = new com.google.protobuf.AbstractParser<MetricDescriptor>() {
    @java.lang.Override
    public MetricDescriptor parsePartialFrom(
        com.google.protobuf.CodedInputStream input,
        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
        throws com.google.protobuf.InvalidProtocolBufferException {
      return new MetricDescriptor(input, extensionRegistry);
    }
  };

  public static com.google.protobuf.Parser<MetricDescriptor> parser() {
    return PARSER;
  }

  @java.lang.Override
  public com.google.protobuf.Parser<MetricDescriptor> getParserForType() {
    return PARSER;
  }

  @java.lang.Override
  public com.google.api.MetricDescriptor getDefaultInstanceForType() {
    return DEFAULT_INSTANCE;
  }

}

