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[Dynamic Instrumentation] Add detailed diagnostics for line probe resolution#8316

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dudikeleti merged 3 commits into
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dudik/fix/probe-resolution-diagnostics
Mar 17, 2026
Merged

[Dynamic Instrumentation] Add detailed diagnostics for line probe resolution#8316
dudikeleti merged 3 commits into
masterfrom
dudik/fix/probe-resolution-diagnostics

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@dudikeleti

@dudikeleti dudikeleti commented Mar 16, 2026

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Summary of changes

Add richer line probe resolution diagnostics in the debugger so line probes report a specific resolution reason instead of only Bound/Unbound/Error.

Add extra debug logging in DatadogMetadataReader to distinguish common PDB lookup failures such as missing associated portable PDBs, missing standalone PDBs, or dnlib reader creation failures.

Reason for change

Customer investigations around Live Debugger line probes getting stuck as unbound needed more actionable diagnostics to distinguish missing symbols, path/version mismatches, missing PDBs, and invalid source mappings.

Implementation details

Added LineProbeResolveReason and LineProbeResolutionDiagnostics so the resolver can return structured diagnostics without changing probe binding behavior.
Kept performance impact low by using a fast path for successful source-file resolution and only collecting assembly scan counts and same-filename matches when the fast path fails.
Reduced log noise by reserving detailed diagnostics for Debug.
Added PDB-reader debug logs.

Test coverage

LineProbeResolverTest

Other details

This PR is focused on observability and diagnosis of line probe resolution failures; it does not attempt to fix the underlying customer binding issue itself.

@dudikeleti
dudikeleti requested a review from a team as a code owner March 16, 2026 23:10
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pr-commenter Bot commented Mar 16, 2026

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Benchmarks

Benchmark execution time: 2026-03-17 15:48:36

Comparing candidate commit 675de0b in PR branch dudik/fix/probe-resolution-diagnostics with baseline commit abcc5ad in branch master.

Found 9 performance improvements and 7 performance regressions! Performance is the same for 162 metrics, 14 unstable metrics.

scenario:Benchmarks.Trace.ActivityBenchmark.StartStopWithChild netcoreapp3.1

  • 🟥 throughput [-7655.749op/s; -5640.864op/s] or [-7.727%; -5.693%]

scenario:Benchmarks.Trace.AgentWriterBenchmark.WriteAndFlushEnrichedTraces netcoreapp3.1

  • 🟥 execution_time [+90.313ms; +90.495ms] or [+80.259%; +80.421%]

scenario:Benchmarks.Trace.Asm.AppSecBodyBenchmark.AllCycleSimpleBody net6.0

  • 🟩 execution_time [-28.752ms; -22.296ms] or [-13.056%; -10.125%]

scenario:Benchmarks.Trace.Asm.AppSecBodyBenchmark.ObjectExtractorSimpleBody net6.0

  • 🟥 execution_time [+19.587ms; +24.416ms] or [+9.862%; +12.293%]

scenario:Benchmarks.Trace.Asm.AppSecBodyBenchmark.ObjectExtractorSimpleBody netcoreapp3.1

  • 🟩 execution_time [-21.671ms; -16.100ms] or [-10.042%; -7.460%]

scenario:Benchmarks.Trace.Asm.AppSecEncoderBenchmark.EncodeLegacyArgs netcoreapp3.1

  • 🟥 execution_time [+26.927ms; +27.845ms] or [+15.019%; +15.530%]

scenario:Benchmarks.Trace.CIVisibilityProtocolWriterBenchmark.WriteAndFlushEnrichedTraces netcoreapp3.1

  • 🟩 execution_time [-47.677ms; -41.554ms] or [-18.030%; -15.715%]
  • 🟩 throughput [+93.218op/s; +127.340op/s] or [+7.324%; +10.005%]

scenario:Benchmarks.Trace.ElasticsearchBenchmark.CallElasticsearch netcoreapp3.1

  • 🟩 throughput [+27414.339op/s; +37856.898op/s] or [+6.247%; +8.626%]

scenario:Benchmarks.Trace.ElasticsearchBenchmark.CallElasticsearchAsync net472

  • 🟥 throughput [-22484.407op/s; -20519.774op/s] or [-7.175%; -6.548%]

scenario:Benchmarks.Trace.Log4netBenchmark.EnrichedLog net6.0

  • 🟩 execution_time [-53.870ms; -49.310ms] or [-26.637%; -24.382%]

scenario:Benchmarks.Trace.Log4netBenchmark.EnrichedLog netcoreapp3.1

  • 🟩 execution_time [-28.380ms; -24.109ms] or [-14.028%; -11.917%]

scenario:Benchmarks.Trace.SerilogBenchmark.EnrichedLog net6.0

  • 🟩 throughput [+12670.087op/s; +15599.706op/s] or [+5.878%; +7.237%]

scenario:Benchmarks.Trace.SerilogBenchmark.EnrichedLog netcoreapp3.1

  • 🟥 throughput [-12997.313op/s; -10649.882op/s] or [-7.360%; -6.030%]

scenario:Benchmarks.Trace.SingleSpanAspNetCoreBenchmark.SingleSpanAspNetCore net6.0

  • 🟥 execution_time [+75.270ms; +76.704ms] or [+81.514%; +83.066%]

scenario:Benchmarks.Trace.SpanBenchmark.StartFinishScope net472

  • 🟩 throughput [+51729.552op/s; +57061.278op/s] or [+6.014%; +6.633%]

@dd-trace-dotnet-ci-bot

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Execution-Time Benchmarks Report ⏱️

Execution-time results for samples comparing This PR (8316) and master.

✅ No regressions detected - check the details below

Full Metrics Comparison

FakeDbCommand

Metric Master (Mean ± 95% CI) Current (Mean ± 95% CI) Change Status
.NET Framework 4.8 - Baseline
duration75.20 ± (75.23 - 75.58) ms74.03 ± (74.06 - 74.41) ms-1.5%
.NET Framework 4.8 - Bailout
duration79.80 ± (79.73 - 80.11) ms78.91 ± (78.66 - 79.04) ms-1.1%
.NET Framework 4.8 - CallTarget+Inlining+NGEN
duration1102.56 ± (1102.61 - 1108.70) ms1083.01 ± (1083.31 - 1089.22) ms-1.8%
.NET Core 3.1 - Baseline
process.internal_duration_ms23.41 ± (23.36 - 23.47) ms22.90 ± (22.85 - 22.95) ms-2.2%
process.time_to_main_ms88.61 ± (88.42 - 88.81) ms86.10 ± (85.93 - 86.26) ms-2.8%
runtime.dotnet.exceptions.count0 ± (0 - 0)0 ± (0 - 0)+0.0%
runtime.dotnet.mem.committed10.91 ± (10.90 - 10.91) MB10.91 ± (10.91 - 10.92) MB+0.1%✅⬆️
runtime.dotnet.threads.count12 ± (12 - 12)12 ± (12 - 12)+0.0%
.NET Core 3.1 - Bailout
process.internal_duration_ms23.18 ± (23.13 - 23.23) ms22.84 ± (22.80 - 22.89) ms-1.5%
process.time_to_main_ms89.71 ± (89.49 - 89.94) ms87.62 ± (87.40 - 87.85) ms-2.3%
runtime.dotnet.exceptions.count0 ± (0 - 0)0 ± (0 - 0)+0.0%
runtime.dotnet.mem.committed10.94 ± (10.93 - 10.94) MB10.95 ± (10.94 - 10.95) MB+0.1%✅⬆️
runtime.dotnet.threads.count13 ± (13 - 13)13 ± (13 - 13)+0.0%
.NET Core 3.1 - CallTarget+Inlining+NGEN
process.internal_duration_ms227.75 ± (226.58 - 228.92) ms226.79 ± (225.53 - 228.04) ms-0.4%
process.time_to_main_ms504.40 ± (503.40 - 505.40) ms495.61 ± (494.79 - 496.43) ms-1.7%
runtime.dotnet.exceptions.count0 ± (0 - 0)0 ± (0 - 0)+0.0%
runtime.dotnet.mem.committed47.18 ± (47.16 - 47.20) MB47.31 ± (47.29 - 47.34) MB+0.3%✅⬆️
runtime.dotnet.threads.count28 ± (28 - 28)28 ± (28 - 28)+0.2%✅⬆️
.NET 6 - Baseline
process.internal_duration_ms21.92 ± (21.87 - 21.97) ms21.59 ± (21.54 - 21.63) ms-1.5%
process.time_to_main_ms76.31 ± (76.14 - 76.48) ms74.67 ± (74.50 - 74.85) ms-2.1%
runtime.dotnet.exceptions.count0 ± (0 - 0)0 ± (0 - 0)+0.0%
runtime.dotnet.mem.committed10.63 ± (10.62 - 10.63) MB10.63 ± (10.63 - 10.64) MB+0.1%✅⬆️
runtime.dotnet.threads.count10 ± (10 - 10)10 ± (10 - 10)+0.0%
.NET 6 - Bailout
process.internal_duration_ms21.85 ± (21.80 - 21.90) ms21.42 ± (21.37 - 21.47) ms-2.0%
process.time_to_main_ms77.49 ± (77.27 - 77.71) ms75.22 ± (75.06 - 75.37) ms-2.9%
runtime.dotnet.exceptions.count0 ± (0 - 0)0 ± (0 - 0)+0.0%
runtime.dotnet.mem.committed10.72 ± (10.71 - 10.72) MB10.74 ± (10.74 - 10.74) MB+0.2%✅⬆️
runtime.dotnet.threads.count11 ± (11 - 11)11 ± (11 - 11)+0.0%
.NET 6 - CallTarget+Inlining+NGEN
process.internal_duration_ms211.24 ± (209.73 - 212.74) ms213.30 ± (211.49 - 215.10) ms+1.0%✅⬆️
process.time_to_main_ms501.60 ± (500.84 - 502.36) ms496.13 ± (495.17 - 497.08) ms-1.1%
runtime.dotnet.exceptions.count0 ± (0 - 0)0 ± (0 - 0)+0.0%
runtime.dotnet.mem.committed49.21 ± (49.18 - 49.24) MB49.25 ± (49.21 - 49.29) MB+0.1%✅⬆️
runtime.dotnet.threads.count29 ± (29 - 29)29 ± (29 - 29)-0.0%
.NET 8 - Baseline
process.internal_duration_ms20.07 ± (20.02 - 20.11) ms19.73 ± (19.69 - 19.76) ms-1.7%
process.time_to_main_ms76.05 ± (75.86 - 76.25) ms74.31 ± (74.14 - 74.48) ms-2.3%
runtime.dotnet.exceptions.count0 ± (0 - 0)0 ± (0 - 0)+0.0%
runtime.dotnet.mem.committed7.64 ± (7.64 - 7.65) MB7.68 ± (7.67 - 7.68) MB+0.4%✅⬆️
runtime.dotnet.threads.count10 ± (10 - 10)10 ± (10 - 10)+0.0%
.NET 8 - Bailout
process.internal_duration_ms20.22 ± (20.18 - 20.27) ms19.76 ± (19.72 - 19.81) ms-2.3%
process.time_to_main_ms77.46 ± (77.25 - 77.66) ms75.56 ± (75.43 - 75.69) ms-2.4%
runtime.dotnet.exceptions.count0 ± (0 - 0)0 ± (0 - 0)+0.0%
runtime.dotnet.mem.committed7.72 ± (7.71 - 7.73) MB7.73 ± (7.72 - 7.74) MB+0.1%✅⬆️
runtime.dotnet.threads.count11 ± (11 - 11)11 ± (11 - 11)+0.0%
.NET 8 - CallTarget+Inlining+NGEN
process.internal_duration_ms169.29 ± (168.26 - 170.31) ms165.98 ± (165.09 - 166.87) ms-2.0%
process.time_to_main_ms485.18 ± (484.38 - 485.98) ms475.58 ± (474.80 - 476.37) ms-2.0%
runtime.dotnet.exceptions.count0 ± (0 - 0)0 ± (0 - 0)+0.0%
runtime.dotnet.mem.committed36.51 ± (36.49 - 36.52) MB36.59 ± (36.57 - 36.61) MB+0.2%✅⬆️
runtime.dotnet.threads.count28 ± (28 - 28)28 ± (28 - 28)+0.4%✅⬆️

HttpMessageHandler

Metric Master (Mean ± 95% CI) Current (Mean ± 95% CI) Change Status
.NET Framework 4.8 - Baseline
duration194.01 ± (193.97 - 194.65) ms193.66 ± (193.53 - 194.32) ms-0.2%
.NET Framework 4.8 - Bailout
duration197.80 ± (197.68 - 198.42) ms196.73 ± (196.37 - 197.01) ms-0.5%
.NET Framework 4.8 - CallTarget+Inlining+NGEN
duration1148.41 ± (1149.16 - 1155.66) ms1147.83 ± (1151.23 - 1159.01) ms-0.1%
.NET Core 3.1 - Baseline
process.internal_duration_ms189.20 ± (188.87 - 189.52) ms187.24 ± (186.88 - 187.59) ms-1.0%
process.time_to_main_ms81.15 ± (80.89 - 81.41) ms80.55 ± (80.34 - 80.77) ms-0.7%
runtime.dotnet.exceptions.count3 ± (3 - 3)3 ± (3 - 3)+0.0%
runtime.dotnet.mem.committed16.12 ± (16.10 - 16.14) MB16.12 ± (16.09 - 16.15) MB-0.0%
runtime.dotnet.threads.count20 ± (19 - 20)20 ± (20 - 20)+0.2%✅⬆️
.NET Core 3.1 - Bailout
process.internal_duration_ms187.80 ± (187.46 - 188.15) ms187.35 ± (187.06 - 187.65) ms-0.2%
process.time_to_main_ms82.21 ± (82.08 - 82.34) ms81.96 ± (81.83 - 82.09) ms-0.3%
runtime.dotnet.exceptions.count3 ± (3 - 3)3 ± (3 - 3)+0.0%
runtime.dotnet.mem.committed16.14 ± (16.11 - 16.18) MB16.20 ± (16.17 - 16.23) MB+0.3%✅⬆️
runtime.dotnet.threads.count21 ± (21 - 21)21 ± (20 - 21)-1.0%
.NET Core 3.1 - CallTarget+Inlining+NGEN
process.internal_duration_ms396.67 ± (394.88 - 398.46) ms393.22 ± (391.39 - 395.04) ms-0.9%
process.time_to_main_ms476.27 ± (475.67 - 476.88) ms472.87 ± (472.25 - 473.50) ms-0.7%
runtime.dotnet.exceptions.count3 ± (3 - 3)3 ± (3 - 3)+0.0%
runtime.dotnet.mem.committed57.91 ± (57.77 - 58.05) MB57.81 ± (57.64 - 57.98) MB-0.2%
runtime.dotnet.threads.count30 ± (30 - 30)30 ± (29 - 30)-0.5%
.NET 6 - Baseline
process.internal_duration_ms192.79 ± (192.40 - 193.18) ms193.43 ± (192.95 - 193.91) ms+0.3%✅⬆️
process.time_to_main_ms70.51 ± (70.34 - 70.68) ms70.43 ± (70.20 - 70.66) ms-0.1%
runtime.dotnet.exceptions.count4 ± (4 - 4)4 ± (4 - 4)+0.0%
runtime.dotnet.mem.committed16.22 ± (16.10 - 16.34) MB16.36 ± (16.26 - 16.46) MB+0.9%✅⬆️
runtime.dotnet.threads.count19 ± (19 - 19)19 ± (19 - 19)+0.2%✅⬆️
.NET 6 - Bailout
process.internal_duration_ms191.54 ± (191.21 - 191.87) ms192.55 ± (192.09 - 193.01) ms+0.5%✅⬆️
process.time_to_main_ms71.34 ± (71.22 - 71.45) ms71.38 ± (71.22 - 71.54) ms+0.1%✅⬆️
runtime.dotnet.exceptions.count4 ± (4 - 4)4 ± (4 - 4)+0.0%
runtime.dotnet.mem.committed16.13 ± (15.98 - 16.27) MB16.31 ± (16.20 - 16.42) MB+1.2%✅⬆️
runtime.dotnet.threads.count20 ± (19 - 20)20 ± (20 - 20)+1.7%✅⬆️
.NET 6 - CallTarget+Inlining+NGEN
process.internal_duration_ms431.80 ± (430.17 - 433.42) ms429.23 ± (427.60 - 430.86) ms-0.6%
process.time_to_main_ms479.94 ± (479.08 - 480.81) ms476.90 ± (476.07 - 477.73) ms-0.6%
runtime.dotnet.exceptions.count4 ± (4 - 4)4 ± (4 - 4)+0.0%
runtime.dotnet.mem.committed60.32 ± (60.25 - 60.39) MB60.36 ± (60.29 - 60.43) MB+0.1%✅⬆️
runtime.dotnet.threads.count30 ± (30 - 30)30 ± (30 - 30)-0.3%
.NET 8 - Baseline
process.internal_duration_ms189.85 ± (189.51 - 190.19) ms189.85 ± (189.49 - 190.21) ms+0.0%✅⬆️
process.time_to_main_ms69.77 ± (69.59 - 69.95) ms69.57 ± (69.38 - 69.75) ms-0.3%
runtime.dotnet.exceptions.count4 ± (4 - 4)4 ± (4 - 4)+0.0%
runtime.dotnet.mem.committed11.82 ± (11.79 - 11.85) MB11.76 ± (11.73 - 11.79) MB-0.5%
runtime.dotnet.threads.count18 ± (18 - 18)18 ± (18 - 18)-0.8%
.NET 8 - Bailout
process.internal_duration_ms189.32 ± (188.95 - 189.69) ms188.19 ± (187.87 - 188.51) ms-0.6%
process.time_to_main_ms70.61 ± (70.50 - 70.73) ms70.45 ± (70.32 - 70.58) ms-0.2%
runtime.dotnet.exceptions.count4 ± (4 - 4)4 ± (4 - 4)+0.0%
runtime.dotnet.mem.committed11.82 ± (11.78 - 11.85) MB11.67 ± (11.58 - 11.77) MB-1.2%
runtime.dotnet.threads.count19 ± (19 - 19)19 ± (18 - 19)-2.8%
.NET 8 - CallTarget+Inlining+NGEN
process.internal_duration_ms354.37 ± (352.79 - 355.94) ms353.49 ± (352.22 - 354.76) ms-0.2%
process.time_to_main_ms451.88 ± (451.24 - 452.52) ms451.71 ± (451.09 - 452.33) ms-0.0%
runtime.dotnet.exceptions.count4 ± (4 - 4)4 ± (4 - 4)+0.0%
runtime.dotnet.mem.committed48.40 ± (48.35 - 48.44) MB48.48 ± (48.44 - 48.52) MB+0.2%✅⬆️
runtime.dotnet.threads.count30 ± (30 - 30)30 ± (30 - 30)+0.3%✅⬆️
Comparison explanation

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 highlighted 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).

Duration charts
FakeDbCommand (.NET Framework 4.8)
gantt
    title Execution time (ms) FakeDbCommand (.NET Framework 4.8)
    dateFormat  x
    axisFormat %Q
    todayMarker off
    section Baseline
    This PR (8316) - mean (74ms)  : 72, 77
    master - mean (75ms)  : 73, 78

    section Bailout
    This PR (8316) - mean (79ms)  : 77, 81
    master - mean (80ms)  : 77, 82

    section CallTarget+Inlining+NGEN
    This PR (8316) - mean (1,086ms)  : 1044, 1129
    master - mean (1,106ms)  : 1061, 1150

Loading
FakeDbCommand (.NET Core 3.1)
gantt
    title Execution time (ms) FakeDbCommand (.NET Core 3.1)
    dateFormat  x
    axisFormat %Q
    todayMarker off
    section Baseline
    This PR (8316) - mean (116ms)  : 113, 119
    master - mean (119ms)  : 115, 123

    section Bailout
    This PR (8316) - mean (118ms)  : 115, 120
    master - mean (120ms)  : 117, 123

    section CallTarget+Inlining+NGEN
    This PR (8316) - mean (759ms)  : 736, 783
    master - mean (769ms)  : 738, 800

Loading
FakeDbCommand (.NET 6)
gantt
    title Execution time (ms) FakeDbCommand (.NET 6)
    dateFormat  x
    axisFormat %Q
    todayMarker off
    section Baseline
    This PR (8316) - mean (103ms)  : 100, 106
    master - mean (105ms)  : 102, 108

    section Bailout
    This PR (8316) - mean (103ms)  : 101, 105
    master - mean (106ms)  : 103, 108

    section CallTarget+Inlining+NGEN
    This PR (8316) - mean (747ms)  : 700, 793
    master - mean (749ms)  : 716, 782

Loading
FakeDbCommand (.NET 8)
gantt
    title Execution time (ms) FakeDbCommand (.NET 8)
    dateFormat  x
    axisFormat %Q
    todayMarker off
    section Baseline
    This PR (8316) - mean (102ms)  : 99, 105
    master - mean (104ms)  : 101, 108

    section Bailout
    This PR (8316) - mean (103ms)  : 102, 105
    master - mean (106ms)  : 102, 109

    section CallTarget+Inlining+NGEN
    This PR (8316) - mean (684ms)  : 661, 706
    master - mean (695ms)  : 670, 719

Loading
HttpMessageHandler (.NET Framework 4.8)
gantt
    title Execution time (ms) HttpMessageHandler (.NET Framework 4.8)
    dateFormat  x
    axisFormat %Q
    todayMarker off
    section Baseline
    This PR (8316) - mean (194ms)  : 190, 198
    master - mean (194ms)  : 191, 198

    section Bailout
    This PR (8316) - mean (197ms)  : 194, 200
    master - mean (198ms)  : 194, 202

    section CallTarget+Inlining+NGEN
    This PR (8316) - mean (1,155ms)  : 1099, 1211
    master - mean (1,152ms)  : 1106, 1199

Loading
HttpMessageHandler (.NET Core 3.1)
gantt
    title Execution time (ms) HttpMessageHandler (.NET Core 3.1)
    dateFormat  x
    axisFormat %Q
    todayMarker off
    section Baseline
    This PR (8316) - mean (276ms)  : 271, 281
    master - mean (279ms)  : 275, 283

    section Bailout
    This PR (8316) - mean (277ms)  : 273, 280
    master - mean (278ms)  : 274, 282

    section CallTarget+Inlining+NGEN
    This PR (8316) - mean (901ms)  : 868, 933
    master - mean (907ms)  : 877, 937

Loading
HttpMessageHandler (.NET 6)
gantt
    title Execution time (ms) HttpMessageHandler (.NET 6)
    dateFormat  x
    axisFormat %Q
    todayMarker off
    section Baseline
    This PR (8316) - mean (272ms)  : 266, 278
    master - mean (272ms)  : 265, 278

    section Bailout
    This PR (8316) - mean (272ms)  : 265, 279
    master - mean (271ms)  : 267, 275

    section CallTarget+Inlining+NGEN
    This PR (8316) - mean (939ms)  : 915, 963
    master - mean (946ms)  : 911, 980

Loading
HttpMessageHandler (.NET 8)
gantt
    title Execution time (ms) HttpMessageHandler (.NET 8)
    dateFormat  x
    axisFormat %Q
    todayMarker off
    section Baseline
    This PR (8316) - mean (269ms)  : 263, 275
    master - mean (269ms)  : 264, 274

    section Bailout
    This PR (8316) - mean (268ms)  : 262, 274
    master - mean (269ms)  : 264, 274

    section CallTarget+Inlining+NGEN
    This PR (8316) - mean (837ms)  : 814, 859
    master - mean (835ms)  : 814, 857

Loading

@dudikeleti
dudikeleti enabled auto-merge (squash) March 17, 2026 14:35
@dudikeleti
dudikeleti force-pushed the dudik/fix/probe-resolution-diagnostics branch from 5e5a686 to 675de0b Compare March 17, 2026 15:04
@dudikeleti
dudikeleti merged commit ba85ce5 into master Mar 17, 2026
141 of 142 checks passed
@dudikeleti
dudikeleti deleted the dudik/fix/probe-resolution-diagnostics branch March 17, 2026 16:35
@github-actions github-actions Bot added this to the vNext-v3 milestone Mar 17, 2026
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2 participants