[otlp] OTLP Exporter Custom serializer - (Part 1) Counter and Gauge (#5958)

Author: Timothy Mothra

src/OpenTelemetry.Exporter.OpenTelemetryProtocol/Implementation/Serializer/ProtobufOtlpMetricFieldNumberConstants.cs

@@ -0,0 +1,153 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+namespace OpenTelemetry.Exporter.OpenTelemetryProtocol.Implementation.Serializer;
+
+using System.Diagnostics.CodeAnalysis;
+
+/// <summary>
+/// Defines field number constants for fields defined in
+/// <see href="https://github.com/open-telemetry/opentelemetry-proto/blob/v1.2.0/opentelemetry/proto/metrics/v1/metrics.proto"/>.
+/// </summary>
+[SuppressMessage("StyleCop.CSharp.NamingRules", "SA1310:Field names should not contain underscore", Justification = "These names describe the nested names and properties in the .Proto file.")]
+internal static class ProtobufOtlpMetricFieldNumberConstants
+{
+    // Metrics Data
+    internal const int MetricsData_Resource_Metrics = 1;
+
+    // Resource Metrics
+    internal const int ResourceMetrics_Resource = 1;
+    internal const int ResourceMetrics_Scope_Metrics = 2;
+    internal const int ResourceMetrics_Schema_Url = 3;
+
+    // Scope Metrics
+    internal const int ScopeMetrics_Scope = 1;
+    internal const int ScopeMetrics_Metrics = 2;
+    internal const int ScopeMetrics_Schema_Url = 3;
+
+    // Metric
+    internal const int Metric_Name = 1;
+    internal const int Metric_Description = 2;
+    internal const int Metric_Unit = 3;
+    internal const int Metric_Data_Gauge = 5;
+    internal const int Metric_Data_Sum = 7;
+    internal const int Metric_Data_Histogram = 9;
+    internal const int Metric_Data_Exponential_Histogram = 10;
+    internal const int Metric_Data_Summary = 11;
+    internal const int Metric_Metadata = 12;
+
+    // Gauge
+    internal const int Gauge_Data_Points = 1;
+
+    // Sum
+    internal const int Sum_Data_Points = 1;
+    internal const int Sum_Aggregation_Temporality = 2;
+    internal const int Sum_Is_Monotonic = 3;
+
+    // Histogram
+    internal const int Histogram_Data_Points = 1;
+    internal const int Histogram_Aggregation_Temporality = 2;
+
+    // Exponential Histogram
+    internal const int ExponentialHistogram_Data_Points = 1;
+    internal const int ExponentialHistogram_Aggregation_Temporality = 2;
+
+    // Summary
+    internal const int Summary_Data_Points = 1;
+
+    // Aggregation Temporality (Enum)
+    internal const int Aggregation_Temporality_Unknown = 0;
+    internal const int Aggregation_Temporality_Delta = 1;
+    internal const int Aggregation_Temporality_Cumulative = 2;
+
+    // Data Point Flags (Enum)
+    internal const int Data_Point_Flags_Do_Not_Use = 0;
+    internal const int Data_Point_Flags_No_Recorded_Value_Mask = 1;
+
+    // Number Data Point
+    internal const int NumberDataPoint_Attributes = 7;
+    internal const int NumberDataPoint_Start_Time_Unix_Nano = 2;
+    internal const int NumberDataPoint_Time_Unix_Nano = 3;
+    internal const int NumberDataPoint_Value_As_Double = 4;
+    internal const int NumberDataPoint_Value_As_Int = 6;
+    internal const int NumberDataPoint_Exemplars = 5;
+    internal const int NumberDataPoint_Flags = 8;
+
+    // Histogram Data Point
+    internal const int HistogramDataPoint_Attributes = 9;
+    internal const int HistogramDataPoint_Start_Time_Unix_Nano = 2;
+    internal const int HistogramDataPoint_Time_Unix_Nano = 3;
+    internal const int HistogramDataPoint_Count = 4;
+    internal const int HistogramDataPoint_Sum = 5;
+    internal const int HistogramDataPoint_Bucket_Counts = 6;
+    internal const int HistogramDataPoint_Explicit_Bounds = 7;
+    internal const int HistogramDataPoint_Exemplars = 8;
+    internal const int HistogramDataPoint_Flags = 10;
+    internal const int HistogramDataPoint_Min = 11;
+    internal const int HistogramDataPoint_Max = 12;
+
+    // Exponential Histogram Data Point
+    internal const int ExponentialHistogramDataPoint_Attributes = 1;
+    internal const int ExponentialHistogramDataPoint_Start_Time_Unix_Nano = 2;
+    internal const int ExponentialHistogramDataPoint_Time_Unix_Nano = 3;
+    internal const int ExponentialHistogramDataPoint_Count = 4;
+    internal const int ExponentialHistogramDataPoint_Sum = 5;
+    internal const int ExponentialHistogramDataPoint_Scale = 6;
+    internal const int ExponentialHistogramDataPoint_Zero_Count = 7;
+    internal const int ExponentialHistogramDataPoint_Positive = 8;
+    internal const int ExponentialHistogramDataPoint_Negative = 9;
+    internal const int ExponentialHistogramDataPoint_Flags = 10;
+    internal const int ExponentialHistogramDataPoint_Exemplars = 11;
+    internal const int ExponentialHistogramDataPoint_Min = 12;
+    internal const int ExponentialHistogramDataPoint_Max = 13;
+    internal const int ExponentialHistogramDataPoint_Zero_Threshold = 14;
+
+    // Exponential Histogram Data Point - Buckets (nested type)
+    internal const int ExponentialHistogramDataPoint_Buckets_Offset = 1;
+    internal const int ExponentialHistogramDataPoint_Buckets_Bucket_Counts = 2;
+
+    // Summary Data Point
+    internal const int SummaryDataPoint_Attributes = 7;
+    internal const int SummaryDataPoint_Start_Time_Unix_Nano = 2;
+    internal const int SummaryDataPoint_Time_Unix_Nano = 3;
+    internal const int SummaryDataPoint_Count = 4;
+    internal const int SummaryDataPoint_Sum = 5;
+    internal const int SummaryDataPoint_Quantile_Values = 6;
+    internal const int SummaryDataPoint_Flags = 8;
+
+    // Summary Data Point - Value At Quantiles (nested type)
+    internal const int SummaryDataPoint_ValueAtQuantiles_Quantile = 1;
+    internal const int SummaryDataPoint_ValueAtQuantiles_Value = 2;
+
+    // Exemplar
+    internal const int Exemplar_Filtered_Attributes = 7;
+    internal const int Exemplar_Time_Unix_Nano = 2;
+    internal const int Exemplar_Value_As_Double = 3;
+    internal const int Exemplar_Value_As_Int = 6;
+    internal const int Exemplar_Span_Id = 4;
+    internal const int Exemplar_Trace_Id = 5;
+
+    // ---------- COMMON FIELDS BELOW THIS LINE ----------
+    // TODO: THESE SHOULD BE MOVED TO A SEPARATE FILE. These are currently copied in each Constants file.
+
+    // InstrumentationScope
+    internal const int InstrumentationScope_Name = 1;
+    internal const int InstrumentationScope_Version = 2;
+    internal const int InstrumentationScope_Attributes = 3;
+    internal const int InstrumentationScope_Dropped_Attributes_Count = 4;
+
+    // KeyValue
+    internal const int KeyValue_Key = 1;
+    internal const int KeyValue_Value = 2;
+
+    // AnyValue
+    internal const int AnyValue_String_Value = 1;
+    internal const int AnyValue_Bool_Value = 2;
+    internal const int AnyValue_Int_Value = 3;
+    internal const int AnyValue_Double_Value = 4;
+    internal const int AnyValue_Array_Value = 5;
+    internal const int AnyValue_Kvlist_Value = 6;
+    internal const int AnyValue_Bytes_Value = 7;
+
+    internal const int ArrayValue_Value = 1;
+}