[blazor] Diagnostic metrics - OTEL names review #62754
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…render_diff.duration and aspnetcore.components.render_diff.size - rename aspnetcore.components.navigation to aspnetcore.components.navigate to match the trace name - rename aspnetcore.components.event_handler to aspnetcore.components.handle_event.duration to match the trace name - rename aspnetcore.components.update_parameters to aspnetcore.components.update_parameters.duration - update unit tests
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Pull Request Overview
This PR aligns Blazor diagnostic metric names with OTEL conventions, splits the render diff metric into separate duration and size histograms, and updates corresponding unit tests.
- Renamed several metrics to include
.durationor match trace names - Added a new histogram for diff size and its bucket boundaries
- Updated unit tests to use renamed metrics and include the new batch size metric
Reviewed Changes
Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.
| File | Description |
|---|---|
| src/Shared/Metrics/MetricsConstants.cs | Added bucket boundaries for diff length histogram |
| src/Components/Components/src/ComponentsMetrics.cs | Renamed metrics, added _batchSize histogram, updated recording logic |
| src/Components/Components/test/ComponentsMetricsTest.cs | Updated tests for renamed metrics and new batch size metric |
Comments suppressed due to low confidence (1)
src/Components/Components/test/ComponentsMetricsTest.cs:384
- [nitpick] Consider adding a test to verify that the batch size histogram is also recorded on error paths and that recorded values fall into expected buckets.
Assert.True(batchSizeMeasurements[0].Value > 0);
JamesNK
reviewed
Jul 16, 2025
| public static readonly IReadOnlyList<double> LongSecondsBucketBoundaries = [0.01, 0.02, 0.05, 0.1, 0.2, 0.5, 1, 2, 5, 10, 30, 60, 120, 300]; | ||
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| // For blazor rendering, which should be very fast. | ||
| public static readonly IReadOnlyList<double> BlazorRenderingSecondsBucketBoundaries = [0.000001, 0.00001, 0.0001, 0.001, 0.005, 0.01, 0.025, 0.05, 0.075, 0.1, 0.25, 0.5, 0.75, 1, 2.5, 5, 7.5, 10]; |
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This has more buckets than other durations (18 compared to 14). I don't know if that's a problem or not, but it's an inconsistency.
| private readonly Histogram<double> _eventDuration; | ||
| private readonly Histogram<double> _parametersDuration; | ||
| private readonly Histogram<double> _batchDuration; | ||
| private readonly Histogram<int> _batchSize; |
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I'm guessing that there would never be more than int.MaxValue items rendered in a batch
Co-authored-by: James Newton-King <[email protected]>
Co-authored-by: James Newton-King <[email protected]>
Co-authored-by: James Newton-King <[email protected]>
javiercn
reviewed
Jul 17, 2025
javiercn
approved these changes
Jul 17, 2025
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aspnetcore.components.render_diffintoaspnetcore.components.render_diff.durationaspnetcore.components.render_diff.sizeaspnetcore.components.navigationtoaspnetcore.components.navigateto match the trace nameaspnetcore.components.event_handlertoaspnetcore.components.handle_event.durationto match the trace nameaspnetcore.components.update_parameterstoaspnetcore.components.update_parameters.durationFixes #62555