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Subscribe to AssemblyLoadContext.Default.Resolving #6148

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merged 2 commits into from
Oct 14, 2024
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kevingosse
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@kevingosse kevingosse commented Oct 11, 2024

Summary of changes

In the managed loader, subscribe to AssemblyLoadContext.Default.Resolving in addition to AppDomain.CurrentDomain.AssemblyResolve.

Reason for change

When an assembly is loaded implicitly (because it's referenced in some code), the JIT compiler calls AssemblyLoadContext.ResolveUsingResolvingEvent. This method asks the current ALC to resolve the assembly, and it will in turn raise its Resolving event if it fails. If the active ALC Resolving event fails, then the global AssemblyLoadContext.AssemblyResolve event is finally raised.

In the managed loader, we subscribe to AppDomain.Current.AssemblyResolve, which is a wrapper around AssemblyLoadContext.AssemblyResolve. It means that the ALC Resolving event has a chance to resolve assemblies before we do.

System.Management.Automation, a powershell library, subscribes to AssemblyLoadContext.Default.Resolving. In its resolution logic, it loads assemblies from the GAC if they're not found, thus loading the .NET Framework version of Datadog.Trace even if the process is running .NET Core. By subscribing to AssemblyLoadContext.Default.Resolving, we prevent that from happining.

Test coverage

Added a smoke test.

Other details

Fixes #6135

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andrewlock commented Oct 11, 2024

Execution-Time Benchmarks Report ⏱️

Execution-time results for samples comparing the following branches/commits:

Execution-time benchmarks measure the whole time it takes to execute a program. And are intended to measure the one-off costs. Cases where the execution time results for the PR are worse than latest master results are shown in red. The following thresholds were used for comparing the execution times:

  • Welch test with statistical test for significance of 5%
  • Only results indicating a difference greater than 5% and 5 ms are considered.

Note that these results are based on a single point-in-time result for each branch. For full results, see the dashboard.

Graphs show the p99 interval based on the mean and StdDev of the test run, as well as the mean value of the run (shown as a diamond below the graph).

gantt
    title Execution time (ms) FakeDbCommand (.NET Framework 4.6.2) 
    dateFormat  X
    axisFormat %s
    todayMarker off
    section Baseline
    This PR (6148) - mean (70ms)  : 67, 73
     .   : milestone, 70,
    master - mean (70ms)  : 67, 72
     .   : milestone, 70,

    section CallTarget+Inlining+NGEN
    This PR (6148) - mean (1,108ms)  : 1081, 1134
     .   : milestone, 1108,
    master - mean (1,110ms)  : 1085, 1135
     .   : milestone, 1110,

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gantt
    title Execution time (ms) FakeDbCommand (.NET Core 3.1) 
    dateFormat  X
    axisFormat %s
    todayMarker off
    section Baseline
    This PR (6148) - mean (108ms)  : 105, 111
     .   : milestone, 108,
    master - mean (109ms)  : 105, 112
     .   : milestone, 109,

    section CallTarget+Inlining+NGEN
    This PR (6148) - mean (769ms)  : 754, 784
     .   : milestone, 769,
    master - mean (771ms)  : 757, 786
     .   : milestone, 771,

Loading
gantt
    title Execution time (ms) FakeDbCommand (.NET 6) 
    dateFormat  X
    axisFormat %s
    todayMarker off
    section Baseline
    This PR (6148) - mean (91ms)  : 89, 94
     .   : milestone, 91,
    master - mean (92ms)  : 89, 95
     .   : milestone, 92,

    section CallTarget+Inlining+NGEN
    This PR (6148) - mean (725ms)  : 709, 742
     .   : milestone, 725,
    master - mean (727ms)  : 710, 744
     .   : milestone, 727,

Loading
gantt
    title Execution time (ms) HttpMessageHandler (.NET Framework 4.6.2) 
    dateFormat  X
    axisFormat %s
    todayMarker off
    section Baseline
    This PR (6148) - mean (189ms)  : 187, 192
     .   : milestone, 189,
    master - mean (189ms)  : 186, 192
     .   : milestone, 189,

    section CallTarget+Inlining+NGEN
    This PR (6148) - mean (1,200ms)  : 1176, 1224
     .   : milestone, 1200,
    master - mean (1,201ms)  : 1179, 1222
     .   : milestone, 1201,

Loading
gantt
    title Execution time (ms) HttpMessageHandler (.NET Core 3.1) 
    dateFormat  X
    axisFormat %s
    todayMarker off
    section Baseline
    This PR (6148) - mean (274ms)  : 269, 280
     .   : milestone, 274,
    master - mean (274ms)  : 269, 278
     .   : milestone, 274,

    section CallTarget+Inlining+NGEN
    This PR (6148) - mean (943ms)  : 925, 960
     .   : milestone, 943,
    master - mean (943ms)  : 926, 960
     .   : milestone, 943,

Loading
gantt
    title Execution time (ms) HttpMessageHandler (.NET 6) 
    dateFormat  X
    axisFormat %s
    todayMarker off
    section Baseline
    This PR (6148) - mean (263ms)  : 260, 266
     .   : milestone, 263,
    master - mean (263ms)  : 259, 267
     .   : milestone, 263,

    section CallTarget+Inlining+NGEN
    This PR (6148) - mean (926ms)  : 904, 947
     .   : milestone, 926,
    master - mean (924ms)  : 908, 940
     .   : milestone, 924,

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datadog-ddstaging bot commented Oct 11, 2024

Datadog Report

Branch report: kevin/alc
Commit report: 614520b
Test service: dd-trace-dotnet

✅ 0 Failed, 361402 Passed, 2071 Skipped, 15h 3m 29.65s Total Time

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Benchmarks Report for tracer 🐌

Benchmarks for #6148 compared to master:

  • All benchmarks have the same speed
  • All benchmarks have the same allocations

The following thresholds were used for comparing the benchmark speeds:

  • Mann–Whitney U test with statistical test for significance of 5%
  • Only results indicating a difference greater than 10% and 0.3 ns are considered.

Allocation changes below 0.5% are ignored.

Benchmark details

Benchmarks.Trace.ActivityBenchmark - Same speed ✔️ Same allocations ✔️

Raw results

Branch Method Toolchain Mean StdError StdDev Gen 0 Gen 1 Gen 2 Allocated
master StartStopWithChild net6.0 7.77μs 44.4ns 327ns 0.0155 0.00774 0 5.43 KB
master StartStopWithChild netcoreapp3.1 10.1μs 50.2ns 230ns 0.0209 0.0105 0 5.62 KB
master StartStopWithChild net472 17μs 46.1ns 179ns 1.01 0.298 0.0828 6.06 KB
#6148 StartStopWithChild net6.0 7.95μs 45ns 318ns 0.0162 0.00811 0 5.43 KB
#6148 StartStopWithChild netcoreapp3.1 10μs 54ns 286ns 0.0196 0.00981 0 5.62 KB
#6148 StartStopWithChild net472 16.6μs 78.7ns 305ns 1 0.281 0.0827 6.06 KB
Benchmarks.Trace.AgentWriterBenchmark - Same speed ✔️ Same allocations ✔️

Raw results

Branch Method Toolchain Mean StdError StdDev Gen 0 Gen 1 Gen 2 Allocated
master WriteAndFlushEnrichedTraces net6.0 474μs 114ns 395ns 0 0 0 2.7 KB
master WriteAndFlushEnrichedTraces netcoreapp3.1 635μs 560ns 2.1μs 0 0 0 2.7 KB
master WriteAndFlushEnrichedTraces net472 867μs 535ns 2.07μs 0.434 0 0 3.3 KB
#6148 WriteAndFlushEnrichedTraces net6.0 472μs 565ns 2.19μs 0 0 0 2.7 KB
#6148 WriteAndFlushEnrichedTraces netcoreapp3.1 631μs 635ns 2.46μs 0 0 0 2.7 KB
#6148 WriteAndFlushEnrichedTraces net472 853μs 776ns 3μs 0.422 0 0 3.3 KB
Benchmarks.Trace.AspNetCoreBenchmark - Same speed ✔️ Same allocations ✔️

Raw results

Branch Method Toolchain Mean StdError StdDev Gen 0 Gen 1 Gen 2 Allocated
master SendRequest net6.0 225μs 1.26μs 8.29μs 0.209 0 0 18.45 KB
master SendRequest netcoreapp3.1 226μs 1.29μs 9.84μs 0.216 0 0 20.61 KB
master SendRequest net472 0.00205ns 0.00102ns 0.00381ns 0 0 0 0 b
#6148 SendRequest net6.0 212μs 1.15μs 6.51μs 0.199 0 0 18.45 KB
#6148 SendRequest netcoreapp3.1 236μs 1.34μs 12μs 0.24 0 0 20.61 KB
#6148 SendRequest net472 0.0122ns 0.00233ns 0.00901ns 0 0 0 0 b
Benchmarks.Trace.CIVisibilityProtocolWriterBenchmark - Same speed ✔️ Same allocations ✔️

Raw results

Branch Method Toolchain Mean StdError StdDev Gen 0 Gen 1 Gen 2 Allocated
master WriteAndFlushEnrichedTraces net6.0 572μs 2.95μs 13.5μs 0.282 0 0 41.63 KB
master WriteAndFlushEnrichedTraces netcoreapp3.1 744μs 4.35μs 41.9μs 0.332 0 0 41.79 KB
master WriteAndFlushEnrichedTraces net472 855μs 2.38μs 8.58μs 8.42 2.66 0.443 53.35 KB
#6148 WriteAndFlushEnrichedTraces net6.0 588μs 3.29μs 21μs 0.566 0 0 41.54 KB
#6148 WriteAndFlushEnrichedTraces netcoreapp3.1 702μs 3.47μs 14.7μs 0.345 0 0 41.79 KB
#6148 WriteAndFlushEnrichedTraces net472 892μs 3.91μs 15.1μs 8.3 2.62 0.437 53.38 KB
Benchmarks.Trace.DbCommandBenchmark - Same speed ✔️ Same allocations ✔️

Raw results

Branch Method Toolchain Mean StdError StdDev Gen 0 Gen 1 Gen 2 Allocated
master ExecuteNonQuery net6.0 1.29μs 0.853ns 3.3ns 0.0142 0 0 1.02 KB
master ExecuteNonQuery netcoreapp3.1 1.82μs 1.7ns 6.58ns 0.0136 0 0 1.02 KB
master ExecuteNonQuery net472 2.1μs 1.48ns 5.34ns 0.156 0 0 987 B
#6148 ExecuteNonQuery net6.0 1.23μs 2.13ns 8.25ns 0.0142 0 0 1.02 KB
#6148 ExecuteNonQuery netcoreapp3.1 1.75μs 1.86ns 7.21ns 0.0141 0 0 1.02 KB
#6148 ExecuteNonQuery net472 2.1μs 2ns 7.74ns 0.156 0 0 987 B
Benchmarks.Trace.ElasticsearchBenchmark - Same speed ✔️ Same allocations ✔️

Raw results

Branch Method Toolchain Mean StdError StdDev Gen 0 Gen 1 Gen 2 Allocated
master CallElasticsearch net6.0 1.21μs 0.6ns 2.24ns 0.0139 0 0 976 B
master CallElasticsearch netcoreapp3.1 1.6μs 4.95ns 19.2ns 0.0132 0 0 976 B
master CallElasticsearch net472 2.41μs 1.27ns 4.41ns 0.158 0 0 995 B
master CallElasticsearchAsync net6.0 1.25μs 0.526ns 1.97ns 0.0131 0 0 952 B
master CallElasticsearchAsync netcoreapp3.1 1.63μs 0.99ns 3.83ns 0.0139 0 0 1.02 KB
master CallElasticsearchAsync net472 2.59μs 1.19ns 4.47ns 0.166 0 0 1.05 KB
#6148 CallElasticsearch net6.0 1.23μs 0.549ns 2.05ns 0.0136 0 0 976 B
#6148 CallElasticsearch netcoreapp3.1 1.66μs 1.2ns 4.34ns 0.0133 0 0 976 B
#6148 CallElasticsearch net472 2.54μs 0.955ns 3.7ns 0.158 0 0 995 B
#6148 CallElasticsearchAsync net6.0 1.31μs 0.951ns 3.43ns 0.0132 0 0 952 B
#6148 CallElasticsearchAsync netcoreapp3.1 1.56μs 1.37ns 5.12ns 0.0139 0 0 1.02 KB
#6148 CallElasticsearchAsync net472 2.63μs 3.93ns 15.2ns 0.167 0 0 1.05 KB
Benchmarks.Trace.GraphQLBenchmark - Same speed ✔️ Same allocations ✔️

Raw results

Branch Method Toolchain Mean StdError StdDev Gen 0 Gen 1 Gen 2 Allocated
master ExecuteAsync net6.0 1.34μs 0.788ns 2.95ns 0.0134 0 0 952 B
master ExecuteAsync netcoreapp3.1 1.66μs 0.345ns 1.24ns 0.0124 0 0 952 B
master ExecuteAsync net472 1.76μs 0.564ns 2.11ns 0.145 0 0 915 B
#6148 ExecuteAsync net6.0 1.27μs 0.645ns 2.41ns 0.0134 0 0 952 B
#6148 ExecuteAsync netcoreapp3.1 1.62μs 1.59ns 6.14ns 0.013 0 0 952 B
#6148 ExecuteAsync net472 1.78μs 0.947ns 3.67ns 0.145 0 0 915 B
Benchmarks.Trace.HttpClientBenchmark - Same speed ✔️ Same allocations ✔️

Raw results

Branch Method Toolchain Mean StdError StdDev Gen 0 Gen 1 Gen 2 Allocated
master SendAsync net6.0 4.2μs 2.3ns 8.6ns 0.0295 0 0 2.22 KB
master SendAsync netcoreapp3.1 5.01μs 3.35ns 13ns 0.0375 0 0 2.76 KB
master SendAsync net472 7.66μs 0.961ns 3.47ns 0.498 0 0 3.15 KB
#6148 SendAsync net6.0 4.1μs 2.35ns 8.81ns 0.0311 0 0 2.22 KB
#6148 SendAsync netcoreapp3.1 5.09μs 2.18ns 8.17ns 0.0356 0 0 2.76 KB
#6148 SendAsync net472 7.84μs 1.55ns 6.02ns 0.498 0 0 3.15 KB
Benchmarks.Trace.ILoggerBenchmark - Same speed ✔️ Same allocations ✔️

Raw results

Branch Method Toolchain Mean StdError StdDev Gen 0 Gen 1 Gen 2 Allocated
master EnrichedLog net6.0 1.52μs 0.766ns 2.87ns 0.0228 0 0 1.64 KB
master EnrichedLog netcoreapp3.1 2.14μs 1.03ns 3.87ns 0.0225 0 0 1.64 KB
master EnrichedLog net472 2.61μs 0.729ns 2.82ns 0.249 0 0 1.57 KB
#6148 EnrichedLog net6.0 1.51μs 1.43ns 5.33ns 0.0232 0 0 1.64 KB
#6148 EnrichedLog netcoreapp3.1 2.18μs 1.63ns 6.3ns 0.0228 0 0 1.64 KB
#6148 EnrichedLog net472 2.66μs 1.09ns 4.23ns 0.25 0 0 1.57 KB
Benchmarks.Trace.Log4netBenchmark - Same speed ✔️ Same allocations ✔️

Raw results

Branch Method Toolchain Mean StdError StdDev Gen 0 Gen 1 Gen 2 Allocated
master EnrichedLog net6.0 116μs 125ns 469ns 0.0584 0 0 4.28 KB
master EnrichedLog netcoreapp3.1 121μs 194ns 701ns 0.0603 0 0 4.28 KB
master EnrichedLog net472 153μs 117ns 454ns 0.685 0.228 0 4.46 KB
#6148 EnrichedLog net6.0 117μs 197ns 764ns 0.0579 0 0 4.28 KB
#6148 EnrichedLog netcoreapp3.1 120μs 127ns 492ns 0.0598 0 0 4.28 KB
#6148 EnrichedLog net472 153μs 147ns 548ns 0.687 0.229 0 4.46 KB
Benchmarks.Trace.NLogBenchmark - Same speed ✔️ Same allocations ✔️

Raw results

Branch Method Toolchain Mean StdError StdDev Gen 0 Gen 1 Gen 2 Allocated
master EnrichedLog net6.0 2.96μs 0.872ns 3.26ns 0.031 0 0 2.2 KB
master EnrichedLog netcoreapp3.1 4.1μs 1.26ns 4.88ns 0.0288 0 0 2.2 KB
master EnrichedLog net472 4.96μs 1.14ns 4.41ns 0.321 0 0 2.02 KB
#6148 EnrichedLog net6.0 2.98μs 1.07ns 4.15ns 0.0312 0 0 2.2 KB
#6148 EnrichedLog netcoreapp3.1 4.09μs 1.87ns 6.98ns 0.0286 0 0 2.2 KB
#6148 EnrichedLog net472 5.04μs 2.17ns 8.4ns 0.32 0 0 2.02 KB
Benchmarks.Trace.RedisBenchmark - Same speed ✔️ Same allocations ✔️

Raw results

Branch Method Toolchain Mean StdError StdDev Gen 0 Gen 1 Gen 2 Allocated
master SendReceive net6.0 1.43μs 0.82ns 3.18ns 0.0164 0 0 1.14 KB
master SendReceive netcoreapp3.1 1.76μs 0.655ns 2.54ns 0.0154 0 0 1.14 KB
master SendReceive net472 2.11μs 0.84ns 3.25ns 0.184 0.00105 0 1.16 KB
#6148 SendReceive net6.0 1.29μs 0.847ns 3.28ns 0.0161 0 0 1.14 KB
#6148 SendReceive netcoreapp3.1 1.88μs 2.11ns 8.17ns 0.0151 0 0 1.14 KB
#6148 SendReceive net472 2.13μs 1.53ns 5.92ns 0.183 0 0 1.16 KB
Benchmarks.Trace.SerilogBenchmark - Same speed ✔️ Same allocations ✔️

Raw results

Branch Method Toolchain Mean StdError StdDev Gen 0 Gen 1 Gen 2 Allocated
master EnrichedLog net6.0 2.8μs 2.58ns 9.65ns 0.0222 0 0 1.6 KB
master EnrichedLog netcoreapp3.1 3.96μs 1.04ns 3.9ns 0.0218 0 0 1.65 KB
master EnrichedLog net472 4.43μs 2.15ns 8.32ns 0.322 0 0 2.04 KB
#6148 EnrichedLog net6.0 2.64μs 2.32ns 9ns 0.0224 0 0 1.6 KB
#6148 EnrichedLog netcoreapp3.1 3.94μs 3.55ns 13.8ns 0.0215 0 0 1.65 KB
#6148 EnrichedLog net472 4.43μs 9.92ns 38.4ns 0.324 0 0 2.04 KB
Benchmarks.Trace.SpanBenchmark - Same speed ✔️ Same allocations ✔️

Raw results

Branch Method Toolchain Mean StdError StdDev Gen 0 Gen 1 Gen 2 Allocated
master StartFinishSpan net6.0 404ns 0.213ns 0.824ns 0.0081 0 0 576 B
master StartFinishSpan netcoreapp3.1 655ns 0.38ns 1.47ns 0.00786 0 0 576 B
master StartFinishSpan net472 701ns 0.453ns 1.7ns 0.0917 0 0 578 B
master StartFinishScope net6.0 485ns 0.239ns 0.924ns 0.00976 0 0 696 B
master StartFinishScope netcoreapp3.1 758ns 0.391ns 1.46ns 0.00957 0 0 696 B
master StartFinishScope net472 873ns 0.405ns 1.57ns 0.104 0 0 658 B
#6148 StartFinishSpan net6.0 403ns 0.226ns 0.875ns 0.0081 0 0 576 B
#6148 StartFinishSpan netcoreapp3.1 630ns 0.414ns 1.6ns 0.00794 0 0 576 B
#6148 StartFinishSpan net472 680ns 0.707ns 2.65ns 0.0916 0 0 578 B
#6148 StartFinishScope net6.0 482ns 0.251ns 0.971ns 0.00974 0 0 696 B
#6148 StartFinishScope netcoreapp3.1 826ns 0.442ns 1.71ns 0.00919 0 0 696 B
#6148 StartFinishScope net472 949ns 0.864ns 3.34ns 0.104 0 0 658 B
Benchmarks.Trace.TraceAnnotationsBenchmark - Same speed ✔️ Same allocations ✔️

Raw results

Branch Method Toolchain Mean StdError StdDev Gen 0 Gen 1 Gen 2 Allocated
master RunOnMethodBegin net6.0 671ns 0.323ns 1.25ns 0.00977 0 0 696 B
master RunOnMethodBegin netcoreapp3.1 974ns 1.03ns 3.84ns 0.0092 0 0 696 B
master RunOnMethodBegin net472 1.16μs 0.465ns 1.8ns 0.104 0 0 658 B
#6148 RunOnMethodBegin net6.0 670ns 0.246ns 0.951ns 0.00966 0 0 696 B
#6148 RunOnMethodBegin netcoreapp3.1 960ns 0.675ns 2.62ns 0.0094 0 0 696 B
#6148 RunOnMethodBegin net472 1.14μs 0.805ns 3.12ns 0.104 0 0 658 B

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Throughput/Crank Report ⚡

Throughput results for AspNetCoreSimpleController comparing the following branches/commits:

Cases where throughput results for the PR are worse than latest master (5% drop or greater), results are shown in red.

Note that these results are based on a single point-in-time result for each branch. For full results, see one of the many, many dashboards!

gantt
    title Throughput Linux x64 (Total requests) 
    dateFormat  X
    axisFormat %s
    section Baseline
    This PR (6148) (11.142M)   : 0, 11141695
    master (11.252M)   : 0, 11251784
    benchmarks/2.9.0 (11.081M)   : 0, 11080577

    section Automatic
    This PR (6148) (7.400M)   : 0, 7399673
    master (7.466M)   : 0, 7465753
    benchmarks/2.9.0 (7.732M)   : 0, 7732233

    section Trace stats
    master (7.766M)   : 0, 7765791

    section Manual
    master (11.114M)   : 0, 11114354

    section Manual + Automatic
    This PR (6148) (6.883M)   : 0, 6883313
    master (6.846M)   : 0, 6845872

    section DD_TRACE_ENABLED=0
    master (10.389M)   : 0, 10388612

Loading
gantt
    title Throughput Linux arm64 (Total requests) 
    dateFormat  X
    axisFormat %s
    section Baseline
    This PR (6148) (9.502M)   : 0, 9502491
    master (9.539M)   : 0, 9539093
    benchmarks/2.9.0 (9.798M)   : 0, 9798067

    section Automatic
    This PR (6148) (6.682M)   : 0, 6681575
    master (6.648M)   : 0, 6647799

    section Trace stats
    master (6.855M)   : 0, 6855301

    section Manual
    master (9.525M)   : 0, 9525425

    section Manual + Automatic
    This PR (6148) (6.230M)   : 0, 6230136
    master (6.161M)   : 0, 6160600

    section DD_TRACE_ENABLED=0
    master (8.832M)   : 0, 8832117

Loading
gantt
    title Throughput Windows x64 (Total requests) 
    dateFormat  X
    axisFormat %s
    section Baseline
    This PR (6148) (9.947M)   : 0, 9946567
    master (10.064M)   : 0, 10064242
    benchmarks/2.9.0 (10.067M)   : 0, 10067315

    section Automatic
    This PR (6148) (6.524M)   : 0, 6523757
    master (6.841M)   : 0, 6841333
    benchmarks/2.9.0 (7.552M)   : 0, 7552193

    section Trace stats
    master (7.427M)   : 0, 7426854

    section Manual
    master (10.084M)   : 0, 10084210

    section Manual + Automatic
    This PR (6148) (6.171M)   : 0, 6170908
    master (6.348M)   : 0, 6347556

    section DD_TRACE_ENABLED=0
    master (9.577M)   : 0, 9576577

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@kevingosse kevingosse merged commit 34444ea into master Oct 14, 2024
74 checks passed
@kevingosse kevingosse deleted the kevin/alc branch October 14, 2024 14:45
@github-actions github-actions bot added this to the vNext-v3 milestone Oct 14, 2024
@andrewlock andrewlock added area:tracer The core tracer library (Datadog.Trace, does not include OpenTracing, native code, or integrations) identified-by:customer labels Oct 23, 2024
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