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| # Telemetry | ||
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| 🚧 This documentation is being written as part of the Polly v8 release. | ||
| Starting with version 8, Polly provides telemetry for all built-in resilience strategies. | ||
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| ## Usage | ||
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| To enable telemetry in Polly, add the `Polly.Extensions` package to your project: | ||
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| ```sh | ||
| dotnet add package Polly.Extensions | ||
| ``` | ||
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| Afterwards, you can use the `ConfigureTelemetry(...)` extension method on the `ResiliencePipelineBuilder`: | ||
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| <!-- snippet: configure-telemetry --> | ||
| ```cs | ||
| var telemetryOptions = new TelemetryOptions | ||
| { | ||
| // Configure logging | ||
| LoggerFactory = LoggerFactory.Create(builder => builder.AddConsole()) | ||
| }; | ||
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| // Configure enrichers | ||
| telemetryOptions.MeteringEnrichers.Add(new MyMeteringEnricher()); | ||
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| // Configure telemetry listeners | ||
| telemetryOptions.TelemetryListeners.Add(new MyTelemetryListener()); | ||
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| var builder = new ResiliencePipelineBuilder() | ||
| .AddTimeout(TimeSpan.FromSeconds(1)) | ||
| .ConfigureTelemetry(telemetryOptions) // This method enables telemetry in the builder | ||
| .Build(); | ||
| ``` | ||
| <!-- endSnippet --> | ||
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| The `MyTelemetryListener` and `MyMeteringEnricher` is implemented as: | ||
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| <!-- snippet: telemetry-listeners --> | ||
| ```cs | ||
| internal class MyTelemetryListener : TelemetryListener | ||
| { | ||
| public override void Write<TResult, TArgs>(in TelemetryEventArguments<TResult, TArgs> args) | ||
| { | ||
| Console.WriteLine($"Telemetry event occurred: {args.Event.EventName}"); | ||
| } | ||
| } | ||
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| internal class MyMeteringEnricher : MeteringEnricher | ||
| { | ||
| public override void Enrich<TResult, TArgs>(in EnrichmentContext<TResult, TArgs> context) | ||
| { | ||
| context.Tags.Add(new("my-custom-tag", "custom-value")); | ||
| } | ||
| } | ||
| ``` | ||
| <!-- endSnippet --> | ||
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| Alternatively, you can use the `AddResiliencePipeline(...)` extension method which automatically enables telemetry for defined pipeline: | ||
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| <!-- snippet: add-resilience-pipeline-with-telemetry --> | ||
| ```cs | ||
| var serviceCollection = new ServiceCollection() | ||
| .AddLogging(builder => builder.AddConsole()) | ||
| .AddResiliencePipeline("my-strategy", builder => builder.AddTimeout(TimeSpan.FromSeconds(1))) | ||
| .Configure<TelemetryOptions>(options => | ||
| { | ||
| // Configure enrichers | ||
| options.MeteringEnrichers.Add(new MyMeteringEnricher()); | ||
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| // Configure telemetry listeners | ||
| options.TelemetryListeners.Add(new MyTelemetryListener()); | ||
| }); | ||
| ``` | ||
| <!-- endSnippet --> | ||
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| ## Metrics | ||
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| The emitted metrics are emitted under the `Polly` meter name. The subsequent sections provide insights into the metrics produced by Polly. Please note that any custom enriched dimensions are not depicted in the following tables. | ||
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| ### resilience-events | ||
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| - Type: *Counter* | ||
| - Description: Emitted upon the occurrence of a resilience event. | ||
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| Dimensions: | ||
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| |Name|Description| | ||
| |---| ---| | ||
| |`event-name`| The name of the emitted event.| | ||
| |`event-severity`| The severity of the event (`Debug`, `Information`, `Warning`, `Error`, `Critical`).| | ||
| |`pipeline-name`| The name of the pipeline corresponding to the resilience pipeline.| | ||
| |`pipeline-instance`| The instance name of the pipeline corresponding to the resilience pipeline.| | ||
| |`strategy-name`| The name of the strategy generating this event.| | ||
| |`operation-key`| The operation key associated with the call site. | | ||
| |`exception-name`| The full name of the exception assigned to the execution result (`System.InvalidOperationException`). | | ||
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| ### execution-attempt-duration | ||
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| - Type: *Histogram* | ||
| - Unit: *milliseconds* | ||
| - Description: Tracks the duration of execution attempts, produced by `Retry` and `Hedging` resilience strategies. | ||
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| Dimensions: | ||
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| |Name|Description| | ||
| |---| ---| | ||
| |`event-name`| The name of the emitted event.| | ||
| |`event-severity`| The severity of the event (`Debug`, `Information`, `Warning`, `Error`, `Critical`).| | ||
| |`pipeline-name`| The name of the pipeline corresponding to the resilience pipeline.| | ||
| |`pipeline-instance`| The instance name of the pipeline corresponding to the resilience pipeline.| | ||
| |`strategy-name`| The name of the strategy generating this event.| | ||
| |`operation-key`| The operation key associated with the call site. | | ||
| |`exception-name`| The full name of the exception assigned to the execution result (`System.InvalidOperationException`). | | ||
| |`attempt-number`| The execution attempt number, starting at 0 (0, 1, 2). | | ||
| |`attempt-handled`| Indicates if the execution outcome was handled. A handled outcome indicates execution failure and the need for retry (`true`, `false`). | | ||
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| ### pipeline-execution-duration | ||
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| - Type: *Histogram* | ||
| - Unit: *milliseconds* | ||
| - Description: Measures the duration and results of resilience pipelines. | ||
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| Dimensions: | ||
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| |Name|Description| | ||
| |---| ---| | ||
| |`pipeline-name`| The name of the pipeline corresponding to the resilience pipeline.| | ||
| |`pipeline-instance`| The instance name of the pipeline corresponding to the resilience pipeline.| | ||
| |`operation-key`| The operation key associated with the call site. | | ||
| |`exception-name`| The full name of the exception assigned to the execution result (`System.InvalidOperationException`). | | ||
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| ## Logs | ||
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| Logs are registered under the `Polly` logger name. Here are some examples of the logs: | ||
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| ``` text | ||
| // This log is recorded whenever a resilience event occurs. EventId = 0 | ||
| Resilience event occurred. EventName: '{EventName}', Source: '{PipelineName}/{PipelineInstance}/{StrategyName}', Operation Key: '{OperationKey}', Result: '{Result}' | ||
| // This log is recorded when a resilience pipeline begins executing. EventId = 1 | ||
| Resilience pipeline executing. Source: '{PipelineName}/{PipelineInstance}', Operation Key: '{OperationKey}' | ||
| // This log is recorded when a resilience pipeline finishes execution. EventId = 2 | ||
| Resilience pipeline executed. Source: '{PipelineName}/{PipelineInstance}', Operation Key: '{OperationKey}', Result: '{Result}', Execution Health: '{ExecutionHealth}', Execution Time: {ExecutionTime}ms | ||
| // This log is recorded upon the completion of every execution attempt. EventId = 3 | ||
| Execution attempt. Source: '{PipelineName}/{PipelineInstance}/{StrategyName}', Operation Key: '{OperationKey}', Result: '{Result}', Handled: '{Handled}', Attempt: '{Attempt}', Execution Time: '{ExecutionTimeMs}' | ||
| ``` | ||
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| ## Emitting telemetry events | ||
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| Each resilience strategy can generate telemetry data through the [`ResilienceStrategyTelemetry`](../src/Polly.Core/Telemetry/ResilienceStrategyTelemetry.cs) API. Polly encapsulates event details as [`TelemetryEventArguments`](../src/Polly.Core/Telemetry/TelemetryEventArguments.cs) and emits them via `TelemetryListener`. | ||
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| To leverage this telemetry data, users should assign a `TelemetryListener` instance to `ResiliencePipelineBuilder.TelemetryListener` and then consume the `TelemetryEventArguments`. | ||
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| For common scenarios, it is expected that users would make use of `Polly.Extensions`. This extension enables telemetry configuration through the `ResiliencePipelineBuilder.ConfigureTelemetry(...)` method, which processes `TelemetryEventArguments` to generate logs and metrics. |
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