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// Copyright 2025 Google LLC
//
// Licensed 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.

syntax = "proto3";

package google.api;

import "google/api/label.proto";
import "google/api/launch_stage.proto";
import "google/protobuf/duration.proto";

option go_package = "google.golang.org/genproto/googleapis/api/metric;metric";
option java_multiple_files = true;
option java_outer_classname = "MetricProto";
option java_package = "com.google.api";
option objc_class_prefix = "GAPI";

// 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.
//
message MetricDescriptor {
  // The kind of measurement. It describes how the data is reported.
  // For information on setting the start time and end time based on
  // the MetricKind, see [TimeInterval][google.monitoring.v3.TimeInterval].
  enum MetricKind {
    // Do not use this default value.
    METRIC_KIND_UNSPECIFIED = 0;

    // An instantaneous measurement of a value.
    GAUGE = 1;

    // The change in a value during a time interval.
    DELTA = 2;

    // 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.
    CUMULATIVE = 3;
  }

  // The value type of a metric.
  enum ValueType {
    // Do not use this default value.
    VALUE_TYPE_UNSPECIFIED = 0;

    // The value is a boolean.
    // This value type can be used only if the metric kind is `GAUGE`.
    BOOL = 1;

    // The value is a signed 64-bit integer.
    INT64 = 2;

    // The value is a double precision floating point number.
    DOUBLE = 3;

    // The value is a text string.
    // This value type can be used only if the metric kind is `GAUGE`.
    STRING = 4;

    // The value is a [`Distribution`][google.api.Distribution].
    DISTRIBUTION = 5;

    // The value is money.
    MONEY = 6;
  }

  // Additional annotations that can be used to guide the usage of a metric.
  message MetricDescriptorMetadata {
    // The resource hierarchy level of the timeseries data of a metric.
    enum TimeSeriesResourceHierarchyLevel {
      // Do not use this default value.
      TIME_SERIES_RESOURCE_HIERARCHY_LEVEL_UNSPECIFIED = 0;

      // Scopes a metric to a project.
      PROJECT = 1;

      // Scopes a metric to an organization.
      ORGANIZATION = 2;

      // Scopes a metric to a folder.
      FOLDER = 3;
    }

    // Deprecated. Must use the
    // [MetricDescriptor.launch_stage][google.api.MetricDescriptor.launch_stage]
    // instead.
    LaunchStage launch_stage = 1 [deprecated = true];

    // 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.
    google.protobuf.Duration sample_period = 2;

    // 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.
    google.protobuf.Duration ingest_delay = 3;

    // The scope of the timeseries data of the metric.
    repeated TimeSeriesResourceHierarchyLevel
        time_series_resource_hierarchy_level = 4;
  }

  // The resource name of the metric descriptor.
  string name = 1;

  // 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"
  string type = 8;

  // 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.
  repeated LabelDescriptor labels = 2;

  // Whether the metric records instantaneous values, changes to a value, etc.
  // Some combinations of `metric_kind` and `value_type` might not be supported.
  MetricKind metric_kind = 3;

  // Whether the measurement is an integer, a floating-point number, etc.
  // Some combinations of `metric_kind` and `value_type` might not be supported.
  ValueType value_type = 4;

  // The units in which the metric value is reported. It is only applicable
  // if the `value_type` is `INT64`, `DOUBLE`, or `DISTRIBUTION`. The `unit`
  // defines the representation of the stored metric values.
  //
  // Different systems might scale the values to be more easily displayed (so a
  // value of `0.02kBy` _might_ be displayed as `20By`, and a value of
  // `3523kBy` _might_ be displayed as `3.5MBy`). However, if the `unit` is
  // `kBy`, then the value of the metric is always in thousands of bytes, no
  // matter how it might be displayed.
  //
  // If you want a custom metric to record the exact number of CPU-seconds used
  // by a job, you can create an `INT64 CUMULATIVE` metric whose `unit` is
  // `s{CPU}` (or equivalently `1s{CPU}` or just `s`). If the job uses 12,005
  // CPU-seconds, then the value is written as `12005`.
  //
  // Alternatively, if you want a custom metric to record data in a more
  // granular way, you can create a `DOUBLE CUMULATIVE` metric whose `unit` is
  // `ks{CPU}`, and then write the value `12.005` (which is `12005/1000`),
  // or use `Kis{CPU}` and write `11.723` (which is `12005/1024`).
  //
  // The supported units are a subset of [The Unified Code for Units of
  // Measure](https://unitsofmeasure.org/ucum.html) standard:
  //
  // **Basic units (UNIT)**
  //
  // * `bit`   bit
  // * `By`    byte
  // * `s`     second
  // * `min`   minute
  // * `h`     hour
  // * `d`     day
  // * `1`     dimensionless
  //
  // **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)
  // * `Pi`    pebi    (2^50)
  //
  // **Grammar**
  //
  // The grammar also includes these connectors:
  //
  // * `/`    division or ratio (as an infix operator). For examples,
  //          `kBy/{email}` or `MiBy/10ms` (although you should almost never
  //          have `/s` in a metric `unit`; rates should always be computed at
  //          query time from the underlying cumulative or delta value).
  // * `.`    multiplication or composition (as an infix operator). For
  //          examples, `GBy.d` or `k{watt}.h`.
  //
  // 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`. If the annotation
  //    is used alone, then the unit is equivalent to `1`. For examples,
  //    `{request}/s == 1/s`, `By{transmitted}/s == By/s`.
  // * `NAME` is a sequence of non-blank printable ASCII characters not
  //    containing `{` or `}`.
  // * `1` represents a unitary [dimensionless
  //    unit](https://en.wikipedia.org/wiki/Dimensionless_quantity) of 1, such
  //    as in `1/s`. It is typically used when none of the basic units are
  //    appropriate. For example, "new users per day" can be represented as
  //    `1/d` or `{new-users}/d` (and a metric value `5` would mean "5 new
  //    users). Alternatively, "thousands of page views per day" would be
  //    represented as `1000/d` or `k1/d` or `k{page_views}/d` (and a metric
  //    value of `5.3` would mean "5300 page views per day").
  // * `%` represents dimensionless value of 1/100, and annotates values giving
  //    a percentage (so the metric values are typically in the range of 0..100,
  //    and a metric value `3` means "3 percent").
  // * `10^2.%` indicates a metric contains a ratio, typically in the range
  //    0..1, that will be multiplied by 100 and displayed as a percentage
  //    (so a metric value `0.03` means "3 percent").
  string unit = 5;

  // A detailed description of the metric, which can be used in documentation.
  string description = 6;

  // 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.
  string display_name = 7;

  // Optional. Metadata which can be used to guide usage of the metric.
  MetricDescriptorMetadata metadata = 10;

  // Optional. The launch stage of the metric definition.
  LaunchStage launch_stage = 12;

  // Read-only. If present, then a [time
  // series][google.monitoring.v3.TimeSeries], which is identified partially by
  // a metric type and a
  // [MonitoredResourceDescriptor][google.api.MonitoredResourceDescriptor], that
  // is associated with this metric type can only be associated with one of the
  // monitored resource types listed here.
  repeated string monitored_resource_types = 13;
}

// A specific metric, identified by specifying values for all of the
// labels of a [`MetricDescriptor`][google.api.MetricDescriptor].
message Metric {
  // An existing metric type, see
  // [google.api.MetricDescriptor][google.api.MetricDescriptor]. For example,
  // `custom.googleapis.com/invoice/paid/amount`.
  string type = 3;

  // The set of label values that uniquely identify this metric. All
  // labels listed in the `MetricDescriptor` must be assigned values.
  map<string, string> labels = 2;
}
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