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StandardMetricsExtractionProcessor.cs
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StandardMetricsExtractionProcessor.cs
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// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT License.
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Diagnostics.Metrics;
using Azure.Monitor.OpenTelemetry.Exporter.Models;
using OpenTelemetry;
using OpenTelemetry.Metrics;
namespace Azure.Monitor.OpenTelemetry.Exporter.Internals
{
internal sealed class StandardMetricsExtractionProcessor : BaseProcessor<Activity>
{
private bool _disposed;
private AzureMonitorResource? _resource;
internal readonly MeterProvider? _meterProvider;
private readonly Meter _meter;
private readonly Histogram<double> _requestDuration;
private readonly Histogram<double> _dependencyDuration;
internal static readonly IReadOnlyDictionary<string, string> s_standardMetricNameMapping = new Dictionary<string, string>()
{
[StandardMetricConstants.RequestDurationInstrumentName] = StandardMetricConstants.RequestDurationMetricIdValue,
[StandardMetricConstants.DependencyDurationInstrumentName] = StandardMetricConstants.DependencyDurationMetricIdValue,
};
internal AzureMonitorResource? StandardMetricResource => _resource ??= ParentProvider?.GetResource().CreateAzureMonitorResource();
internal StandardMetricsExtractionProcessor(AzureMonitorMetricExporter metricExporter)
{
_meterProvider = Sdk.CreateMeterProviderBuilder()
.AddMeter(StandardMetricConstants.StandardMetricMeterName)
.AddReader(new PeriodicExportingMetricReader(metricExporter)
{ TemporalityPreference = MetricReaderTemporalityPreference.Delta })
.Build();
_meter = new Meter(StandardMetricConstants.StandardMetricMeterName);
_requestDuration = _meter.CreateHistogram<double>(StandardMetricConstants.RequestDurationInstrumentName);
_dependencyDuration = _meter.CreateHistogram<double>(StandardMetricConstants.DependencyDurationInstrumentName);
}
public override void OnEnd(Activity activity)
{
if (activity.Kind == ActivityKind.Server || activity.Kind == ActivityKind.Consumer)
{
if (_requestDuration.Enabled)
{
activity.SetTag("_MS.ProcessedByMetricExtractors", "(Name: X,Ver:'1.1')");
ReportRequestDurationMetric(activity);
}
}
if (activity.Kind == ActivityKind.Client || activity.Kind == ActivityKind.Internal || activity.Kind == ActivityKind.Producer)
{
if (_dependencyDuration.Enabled)
{
activity.SetTag("_MS.ProcessedByMetricExtractors", "(Name: X,Ver:'1.1')");
ReportDependencyDurationMetric(activity);
}
}
}
private void ReportRequestDurationMetric(Activity activity)
{
string? statusCodeAttributeValue = null;
foreach (ref readonly var tag in activity.EnumerateTagObjects())
{
if (tag.Key == SemanticConventions.AttributeHttpResponseStatusCode || tag.Key == SemanticConventions.AttributeHttpStatusCode)
{
statusCodeAttributeValue = tag.Value?.ToString();
break;
}
}
TagList tags = default;
tags.Add(new KeyValuePair<string, object?>(StandardMetricConstants.RequestResultCodeKey, statusCodeAttributeValue ?? "0"));
tags.Add(new KeyValuePair<string, object?>(StandardMetricConstants.MetricIdKey, StandardMetricConstants.RequestDurationMetricIdValue));
tags.Add(new KeyValuePair<string, object?>(StandardMetricConstants.IsAutoCollectedKey, "True"));
tags.Add(new KeyValuePair<string, object?>(StandardMetricConstants.CloudRoleInstanceKey, StandardMetricResource?.RoleInstance));
tags.Add(new KeyValuePair<string, object?>(StandardMetricConstants.CloudRoleNameKey, StandardMetricResource?.RoleName));
tags.Add(new KeyValuePair<string, object?>(StandardMetricConstants.RequestSuccessKey, RequestData.IsSuccess(activity, statusCodeAttributeValue, OperationType.Http)));
// Report metric
_requestDuration.Record(activity.Duration.TotalMilliseconds, tags);
}
private void ReportDependencyDurationMetric(Activity activity)
{
var activityTagsProcessor = TraceHelper.EnumerateActivityTags(activity);
string? dependencyTarget;
string? statusCode;
if (activityTagsProcessor.activityType.HasFlag(OperationType.V2))
{
// Reverting it for dependency type checks below
activityTagsProcessor.activityType &= ~OperationType.V2;
dependencyTarget = activityTagsProcessor.MappedTags.GetNewSchemaDependencyTarget(activityTagsProcessor.activityType);
statusCode = AzMonList.GetTagValue(ref activityTagsProcessor.MappedTags, SemanticConventions.AttributeHttpResponseStatusCode)?.ToString();
}
else
{
dependencyTarget = activityTagsProcessor.MappedTags.GetDependencyTarget(activityTagsProcessor.activityType);
statusCode = AzMonList.GetTagValue(ref activityTagsProcessor.MappedTags, SemanticConventions.AttributeHttpStatusCode)?.ToString();
}
string? dependencyType;
if (activityTagsProcessor.AzureNamespace != null)
{
dependencyType = TraceHelper.GetAzureSDKDependencyType(activity.Kind, activityTagsProcessor.AzureNamespace);
}
else
{
dependencyType = activity.Kind == ActivityKind.Internal ? "InProc" : activityTagsProcessor.MappedTags.GetDependencyType(activityTagsProcessor.activityType);
}
TagList tags = default;
tags.Add(new KeyValuePair<string, object?>(StandardMetricConstants.DependencyTargetKey, dependencyTarget));
tags.Add(new KeyValuePair<string, object?>(StandardMetricConstants.DependencyResultCodeKey, statusCode ?? "0"));
tags.Add(new KeyValuePair<string, object?>(StandardMetricConstants.MetricIdKey, StandardMetricConstants.DependencyDurationMetricIdValue));
tags.Add(new KeyValuePair<string, object?>(StandardMetricConstants.IsAutoCollectedKey, "True"));
tags.Add(new KeyValuePair<string, object?>(StandardMetricConstants.CloudRoleInstanceKey, StandardMetricResource?.RoleInstance));
tags.Add(new KeyValuePair<string, object?>(StandardMetricConstants.CloudRoleNameKey, StandardMetricResource?.RoleName));
tags.Add(new KeyValuePair<string, object?>(StandardMetricConstants.DependencySuccessKey, activity.Status != ActivityStatusCode.Error));
tags.Add(new KeyValuePair<string, object?>(StandardMetricConstants.DependencyTypeKey, dependencyType));
// Report metric
_dependencyDuration.Record(activity.Duration.TotalMilliseconds, tags);
activityTagsProcessor.Return();
}
protected override void Dispose(bool disposing)
{
if (!_disposed)
{
if (disposing)
{
try
{
_meterProvider?.Dispose();
_meter?.Dispose();
}
catch (Exception)
{
}
}
_disposed = true;
}
base.Dispose(disposing);
}
}
}