1 | /**
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2 | * Copyright 2018, OpenCensus Authors
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3 | *
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4 | * Licensed under the Apache License, Version 2.0 (the "License");
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5 | * you may not use this file except in compliance with the License.
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6 | * You may obtain a copy of the License at
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7 | *
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8 | * http://www.apache.org/licenses/LICENSE-2.0
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9 | *
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10 | * Unless required by applicable law or agreed to in writing, software
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11 | * distributed under the License is distributed on an "AS IS" BASIS,
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12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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13 | * See the License for the specific language governing permissions and
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14 | * limitations under the License.
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15 | */
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16 | /** Properties of a Metric which has one or more timeseries */
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17 | export interface Metric {
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18 | /**
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19 | * The descriptor of the Metric. This is an optimization for network wire
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20 | * size, from data-model perspective a Metric contains always
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21 | * a MetricDescriptor.
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22 | * In case of a streaming RPC can be sent only
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23 | * the first time a metric is reported to save network traffic.
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24 | */
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25 | readonly descriptor: MetricDescriptor;
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26 | /**
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27 | * One or more timeseries for a single metric, where each timeseries has
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28 | * one or more points.
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29 | */
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30 | readonly timeseries: TimeSeries[];
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31 | }
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32 | /** Properties of a Metric type and its schema */
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33 | export interface MetricDescriptor {
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34 | /** The metric type, including its DNS name prefix. It must be unique. */
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35 | readonly name: string;
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36 | /**
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37 | * A detailed description of the metric, which can be used in documentation.
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38 | */
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39 | readonly description: string;
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40 | /**
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41 | * The unit in which the metric value is reported. Follows the format
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42 | * described by http://unitsofmeasure.org/ucum.html.
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43 | */
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44 | readonly unit: string;
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45 | /** MetricDescriptor type */
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46 | readonly type: MetricDescriptorType;
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47 | /** The label keys associated with the metric descriptor. */
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48 | readonly labelKeys: LabelKey[];
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49 | }
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50 | /**
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51 | * The kind of metric. It describes how the data is reported.
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52 | *
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53 | * A gauge is an instantaneous measurement of a value.
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54 | *
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55 | * A cumulative measurement is a value accumulated over a time interval. In
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56 | * a time series, cumulative measurements should have the same start time,
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57 | * increasing values and increasing end times, until an event resets the
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58 | * cumulative value to zero and sets a new start time for the following
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59 | * points.
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60 | */
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61 | export declare enum MetricDescriptorType {
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62 | /** Do not use this default value. */
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63 | UNSPECIFIED = 0,
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64 | /** Integer gauge. The value can go both up and down. */
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65 | GAUGE_INT64 = 1,
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66 | /** Floating point gauge. The value can go both up and down. */
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67 | GAUGE_DOUBLE = 2,
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68 | /**
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69 | * Distribution gauge measurement. The count and sum can go both up and
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70 | * down. Recorded values are always >= 0.
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71 | * Used in scenarios like a snapshot of time the current items in a queue
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72 | * have spent there.
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73 | */
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74 | GAUGE_DISTRIBUTION = 3,
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75 | /**
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76 | * Integer cumulative measurement. The value cannot decrease, if resets
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77 | * then the start_time should also be reset.
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78 | */
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79 | CUMULATIVE_INT64 = 4,
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80 | /**
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81 | * Floating point cumulative measurement. The value cannot decrease, if
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82 | * resets then the start_time should also be reset. Recorded values are
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83 | * always >= 0.
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84 | */
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85 | CUMULATIVE_DOUBLE = 5,
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86 | /**
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87 | * Distribution cumulative measurement. The count and sum cannot decrease,
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88 | * if resets then the start_time should also be reset.
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89 | */
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90 | CUMULATIVE_DISTRIBUTION = 6,
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91 | /**
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92 | * Some frameworks implemented Histograms as a summary of observations
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93 | * (usually things like request durations and response sizes). While it
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94 | * also provides a total count of observations and a sum of all observed
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95 | * values, it calculates configurable percentiles over a sliding time
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96 | * window. This is not recommended, since it cannot be aggregated.
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97 | */
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98 | SUMMARY = 7
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99 | }
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100 | /** Properties of a LabelKey associated with a MetricDescriptor. */
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101 | export interface LabelKey {
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102 | /** The key for the label. */
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103 | readonly key: string;
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104 | /** A human-readable description of what this label key represents. */
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105 | readonly description: string;
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106 | }
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107 | /**
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108 | * A collection of data points that describes the time-varying values
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109 | * of a metric.
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110 | */
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111 | export interface TimeSeries {
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112 | /**
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113 | * Must be present for cumulative metrics. The time when the cumulative value
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114 | * was reset to zero. Exclusive. The cumulative value is over the time
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115 | * interval (start_timestamp, timestamp]. If not specified, the backend can
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116 | * use the previous recorded value.
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117 | */
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118 | readonly startTimestamp?: Timestamp;
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119 | /**
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120 | * The set of label values that uniquely identify this timeseries. Applies to
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121 | * all points. The order of label values must match that of label keys in the
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122 | * metric descriptor.
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123 | */
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124 | readonly labelValues: LabelValue[];
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125 | /**
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126 | * The data points of this timeseries. Point.value type MUST match the
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127 | * MetricDescriptor.type.
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128 | */
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129 | readonly points: Point[];
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130 | }
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131 | /** The LabelValue type. null value indicates an unset. */
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132 | export interface LabelValue {
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133 | /** The value for the label. */
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134 | readonly value: string | null;
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135 | }
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136 | /** A timestamped measurement. */
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137 | export interface Point {
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138 | /**
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139 | * The moment when this point was recorded. Inclusive.
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140 | * If not specified, the timestamp will be decided by the backend.
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141 | */
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142 | readonly timestamp: Timestamp;
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143 | /**
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144 | * The actual point value.
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145 | * 64-bit integer or 64-bit double-precision floating-point number
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146 | * or distribution value
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147 | * or summary value. This is not recommended, since it cannot be aggregated.
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148 | */
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149 | readonly value: number | DistributionValue | SummaryValue;
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150 | }
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151 | /**
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152 | * Distribution contains summary statistics for a population of values. It
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153 | * optionally contains a histogram representing the distribution of those
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154 | * values across a set of buckets.
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155 | */
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156 | export interface DistributionValue {
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157 | /**
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158 | * The number of values in the population. Must be non-negative. This value
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159 | * must equal the sum of the values in bucket_counts if a histogram is
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160 | * provided.
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161 | */
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162 | readonly count: number;
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163 | /**
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164 | * The sum of the values in the population. If count is zero then this field
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165 | * must be zero.
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166 | */
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167 | readonly sum: number;
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168 | /**
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169 | * The sum of squared deviations from the mean of the values in the
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170 | * population. For values x_i this is:
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171 | *
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172 | * Sum[i=1..n]((x_i - mean)^2)
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173 | *
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174 | * Knuth, "The Art of Computer Programming", Vol. 2, page 323, 3rd edition
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175 | * describes Welford's method for accumulating this sum in one pass.
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176 | *
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177 | * If count is zero then this field must be zero.
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178 | */
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179 | readonly sumOfSquaredDeviation: number;
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180 | /**
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181 | * Don't change bucket boundaries within a TimeSeries if your backend doesn't
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182 | * support this. To save network bandwidth this field can be sent only the
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183 | * first time a metric is sent when using a streaming RPC.
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184 | */
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185 | readonly bucketOptions: BucketOptions;
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186 | /** DistributionValue buckets */
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187 | readonly buckets: Bucket[];
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188 | }
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189 | /**
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190 | * Properties of a BucketOptions.
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191 | * A Distribution may optionally contain a histogram of the values in the
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192 | * population. The bucket boundaries for that histogram are described by
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193 | * BucketOptions.
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194 | *
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195 | * If bucket_options has no type, then there is no histogram associated with
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196 | * the Distribution.
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197 | */
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198 | export interface BucketOptions {
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199 | /** Bucket with explicit bounds. */
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200 | readonly explicit: Explicit;
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201 | }
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202 | /**
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203 | * Properties of an Explicit.
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204 | * Specifies a set of buckets with arbitrary upper-bounds.
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205 | * This defines size(bounds) + 1 (= N) buckets. The boundaries for bucket
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206 | * index i are:
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207 | *
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208 | * [0, bucket_bounds[i]) for i == 0
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209 | * [bucket_bounds[i-1], bucket_bounds[i]) for 0 < i < N-1
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210 | * [bucket_bounds[i-1], +infinity) for i == N-1
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211 | */
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212 | export interface Explicit {
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213 | /** The values must be strictly increasing and > 0. */
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214 | readonly bounds: number[];
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215 | }
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216 | /** Properties of a Bucket. */
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217 | export interface Bucket {
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218 | /**
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219 | * The number of values in each bucket of the histogram, as described in
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220 | * bucket_bounds.
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221 | */
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222 | readonly count: number;
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223 | /**
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224 | * If the distribution does not have a histogram, then omit this field.
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225 | */
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226 | readonly exemplar?: Exemplar;
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227 | }
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228 | /**
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229 | * Exemplars are example points that may be used to annotate aggregated
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230 | * Distribution values. They are metadata that gives information about a
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231 | * particular value added to a Distribution bucket.
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232 | */
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233 | export interface Exemplar {
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234 | /**
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235 | * Value of the exemplar point. It determines which bucket the exemplar
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236 | * belongs to.
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237 | */
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238 | readonly value: number;
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239 | /** The observation (sampling) time of the above value. */
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240 | readonly timestamp: Timestamp;
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241 | /** Contextual information about the example value. */
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242 | readonly attachments: {
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243 | [key: string]: string;
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244 | };
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245 | }
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246 | /**
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247 | * The start_timestamp only applies to the count and sum in the SummaryValue.
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248 | */
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249 | export interface SummaryValue {
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250 | /**
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251 | * The total number of recorded values since start_time. Optional since
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252 | * some systems don't expose this.
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253 | */
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254 | readonly count: number;
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255 | /**
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256 | * The total sum of recorded values since start_time. Optional since some
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257 | * systems don't expose this. If count is zero then this field must be zero.
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258 | * This field must be unset if the sum is not available.
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259 | */
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260 | readonly sum: number;
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261 | /** Values calculated over an arbitrary time window. */
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262 | readonly snapshot?: Snapshot;
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263 | }
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264 | /**
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265 | * The values in this message can be reset at arbitrary unknown times, with
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266 | * the requirement that all of them are reset at the same time.
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267 | */
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268 | export interface Snapshot {
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269 | /**
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270 | * The number of values in the snapshot. Optional since some systems don't
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271 | * expose this.
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272 | */
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273 | readonly count: number;
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274 | /**
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275 | * The sum of values in the snapshot. Optional since some systems don't
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276 | * expose this. If count is zero then this field must be zero or not set
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277 | * (if not supported).
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278 | */
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279 | readonly sum: number;
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280 | /**
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281 | * A list of values at different percentiles of the distribution calculated
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282 | * from the current snapshot. The percentiles must be strictly increasing.
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283 | */
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284 | readonly percentileValues: ValueAtPercentile[];
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285 | }
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286 | /**
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287 | * Represents the value at a given percentile of a distribution.
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288 | */
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289 | export interface ValueAtPercentile {
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290 | /** The percentile of a distribution. Must be in the interval (0.0, 100.0]. */
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291 | readonly percentile: number;
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292 | /** The value at the given percentile of a distribution. */
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293 | readonly value: number;
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294 | }
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295 | export interface Timestamp {
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296 | /**
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297 | * Represents seconds of UTC time since Unix epoch
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298 | * 1970-01-01T00:00:00Z. Must be from 0001-01-01T00:00:00Z to
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299 | * 9999-12-31T23:59:59Z inclusive.
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300 | */
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301 | seconds: number | null;
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302 | /**
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303 | * Non-negative fractions of a second at nanosecond resolution. Negative
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304 | * second values with fractions must still have non-negative nanos values
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305 | * that count forward in time. Must be from 0 to 999,999,999
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306 | * inclusive.
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307 | */
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308 | nanos: number | null;
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309 | }
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310 | /**
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311 | * Keeps a set of MetricProducer that is used by exporters to determine the
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312 | * metrics that need to be exported.
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313 | */
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314 | export interface MetricProducerManager {
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315 | /** Adds the MetricProducer to the manager */
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316 | add(metricProducer: MetricProducer): void;
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317 | /** Removes the MetricProducer to the manager */
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318 | remove(metricProducer: MetricProducer): void;
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319 | /** Clears all MetricProducers */
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320 | removeAll(): void;
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321 | /** Gets all registered MetricProducers that should be exported */
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322 | getAllMetricProducer(): Set<MetricProducer>;
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323 | }
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324 | /**
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325 | * A MetricProducer producer that can be registered for exporting using
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326 | * MetricProducerManager.
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327 | */
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328 | export interface MetricProducer {
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329 | /** Gets a collection of produced Metric`s to be exported */
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330 | getMetrics(): Metric[];
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331 | }
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