dd-trace-dotnet Stop storing tracer setting telemetry forever

Summary of changes

Stop storing the TracerSettings telemetry forever

Reason for change

Back in v2, when we first implemented config telemetry, we had to store the telemetry on TracerSettings, because a customer could "reconfigure" the tracer with an existing TracerSettings object, thereby overriding the "latest" config. Put another way, the config recorded when the TracerSettings was created, wasn't necessarily the config actually used.

As of v3, and particularly with the MutableSettings split, this is no longer the case. The TracerSettings object is created only once, and the results are immutable, so there's no need to keep the config around "just in case".

Implementation details

Instead of creating a dedicated ConfigurationTelemetry object associated with the TracerSettings, and then copying it into the collector, just write directly to the collector.

Test coverage

Should be covered by existing, but updated some tests (and made one of the constructor overloads easier to use in tests)

Other details

Should have a (tiny) impact on startup time and overall memory use

Dec 05 '25 16:12 andrewlock

⚠️ Tests

⚠️ Warnings

❄️ 2 New flaky tests detected

SinkRejectsGiantMessages from Datadog.Trace.Tests.Logging.DirectSubmission.Sink.DatadogSinkTests (Datadog)
Expected logsApi.Logs to be True, but found False.
SinkBatchesMultipleLogs from Datadog.Trace.Tests.Logging.DirectSubmission.Sink.OtlpSinkTests (Datadog)
Expected capturedLogs to be True, but found False.

ℹ️ Info

🧪 All tests passed

_{This comment will be updated automatically if new data arrives.

🔗 Commit SHA: 43a58d3 | Docs | Datadog PR Page | Was this helpful? Give us feedback!}

Dec 05 '25 16:12 datadog-datadog-prod-us1[bot]

Execution-Time Benchmarks Report :stopwatch:

Execution-time results for samples comparing This PR (7914) 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
duration	75.12 ± (75.21 - 75.88) ms	74.51 ± (74.59 - 75.30) ms	-0.8%	✅
.NET Framework 4.8 - Bailout
duration	79.31 ± (79.35 - 80.15) ms	80.25 ± (80.15 - 80.89) ms	+1.2%	✅⬆️
.NET Framework 4.8 - CallTarget+Inlining+NGEN
duration	1059.72 ± (1057.54 - 1065.46) ms	1058.97 ± (1059.36 - 1067.91) ms	-0.1%	✅
.NET Core 3.1 - Baseline
process.internal_duration_ms	23.12 ± (23.04 - 23.20) ms	23.21 ± (23.13 - 23.29) ms	+0.4%	✅⬆️
process.time_to_main_ms	88.80 ± (88.40 - 89.20) ms	88.36 ± (88.02 - 88.70) ms	-0.5%	✅
runtime.dotnet.exceptions.count	0 ± (0 - 0)	0 ± (0 - 0)	+0.0%	✅
runtime.dotnet.mem.committed	10.93 ± (10.93 - 10.94) MB	10.92 ± (10.91 - 10.92) MB	-0.1%	✅
runtime.dotnet.threads.count	12 ± (12 - 12)	12 ± (12 - 12)	+0.0%	✅
.NET Core 3.1 - Bailout
process.internal_duration_ms	22.77 ± (22.70 - 22.84) ms	22.85 ± (22.79 - 22.91) ms	+0.3%	✅⬆️
process.time_to_main_ms	88.71 ± (88.35 - 89.06) ms	88.44 ± (88.15 - 88.73) ms	-0.3%	✅
runtime.dotnet.exceptions.count	0 ± (0 - 0)	0 ± (0 - 0)	+0.0%	✅
runtime.dotnet.mem.committed	10.97 ± (10.97 - 10.98) MB	10.95 ± (10.95 - 10.95) MB	-0.2%	✅
runtime.dotnet.threads.count	13 ± (13 - 13)	13 ± (13 - 13)	+0.0%	✅
.NET Core 3.1 - CallTarget+Inlining+NGEN
process.internal_duration_ms	222.25 ± (220.95 - 223.56) ms	222.75 ± (221.50 - 224.00) ms	+0.2%	✅⬆️
process.time_to_main_ms	500.24 ± (499.11 - 501.37) ms	500.91 ± (499.76 - 502.06) ms	+0.1%	✅⬆️
runtime.dotnet.exceptions.count	0 ± (0 - 0)	0 ± (0 - 0)	+0.0%	✅
runtime.dotnet.mem.committed	47.87 ± (47.85 - 47.89) MB	47.94 ± (47.92 - 47.96) MB	+0.1%	✅⬆️
runtime.dotnet.threads.count	28 ± (28 - 28)	28 ± (28 - 28)	+0.5%	✅⬆️
.NET 6 - Baseline
process.internal_duration_ms	21.70 ± (21.62 - 21.77) ms	21.87 ± (21.80 - 21.94) ms	+0.8%	✅⬆️
process.time_to_main_ms	76.63 ± (76.34 - 76.92) ms	75.98 ± (75.71 - 76.25) ms	-0.8%	✅
runtime.dotnet.exceptions.count	0 ± (0 - 0)	0 ± (0 - 0)	+0.0%	✅
runtime.dotnet.mem.committed	10.62 ± (10.62 - 10.63) MB	10.63 ± (10.63 - 10.63) MB	+0.1%	✅⬆️
runtime.dotnet.threads.count	10 ± (10 - 10)	10 ± (10 - 10)	+0.0%	✅
.NET 6 - Bailout
process.internal_duration_ms	21.83 ± (21.77 - 21.90) ms	21.93 ± (21.86 - 22.00) ms	+0.4%	✅⬆️
process.time_to_main_ms	77.84 ± (77.55 - 78.13) ms	78.66 ± (78.34 - 78.99) ms	+1.1%	✅⬆️
runtime.dotnet.exceptions.count	0 ± (0 - 0)	0 ± (0 - 0)	+0.0%	✅
runtime.dotnet.mem.committed	10.67 ± (10.66 - 10.67) MB	10.68 ± (10.67 - 10.68) MB	+0.1%	✅⬆️
runtime.dotnet.threads.count	11 ± (11 - 11)	11 ± (11 - 11)	+0.0%	✅
.NET 6 - CallTarget+Inlining+NGEN
process.internal_duration_ms	210.92 ± (209.78 - 212.06) ms	213.00 ± (211.74 - 214.27) ms	+1.0%	✅⬆️
process.time_to_main_ms	468.69 ± (467.67 - 469.71) ms	468.94 ± (467.87 - 470.01) ms	+0.1%	✅⬆️
runtime.dotnet.exceptions.count	0 ± (0 - 0)	0 ± (0 - 0)	+0.0%	✅
runtime.dotnet.mem.committed	48.09 ± (48.07 - 48.12) MB	48.13 ± (48.11 - 48.15) MB	+0.1%	✅⬆️
runtime.dotnet.threads.count	28 ± (28 - 28)	28 ± (28 - 28)	+0.0%	✅⬆️
.NET 8 - Baseline
process.internal_duration_ms	19.81 ± (19.75 - 19.88) ms	19.91 ± (19.85 - 19.97) ms	+0.5%	✅⬆️
process.time_to_main_ms	75.09 ± (74.74 - 75.43) ms	75.44 ± (75.17 - 75.71) ms	+0.5%	✅⬆️
runtime.dotnet.exceptions.count	0 ± (0 - 0)	0 ± (0 - 0)	+0.0%	✅
runtime.dotnet.mem.committed	7.68 ± (7.67 - 7.68) MB	7.64 ± (7.64 - 7.65) MB	-0.5%	✅
runtime.dotnet.threads.count	10 ± (10 - 10)	10 ± (10 - 10)	+0.0%	✅
.NET 8 - Bailout
process.internal_duration_ms	19.95 ± (19.88 - 20.01) ms	19.90 ± (19.84 - 19.96) ms	-0.2%	✅
process.time_to_main_ms	76.98 ± (76.68 - 77.28) ms	77.10 ± (76.82 - 77.39) ms	+0.2%	✅⬆️
runtime.dotnet.exceptions.count	0 ± (0 - 0)	0 ± (0 - 0)	+0.0%	✅
runtime.dotnet.mem.committed	7.74 ± (7.73 - 7.74) MB	7.70 ± (7.69 - 7.71) MB	-0.5%	✅
runtime.dotnet.threads.count	11 ± (11 - 11)	11 ± (11 - 11)	+0.0%	✅
.NET 8 - CallTarget+Inlining+NGEN
process.internal_duration_ms	191.44 ± (190.35 - 192.53) ms	193.87 ± (192.97 - 194.76) ms	+1.3%	✅⬆️
process.time_to_main_ms	453.43 ± (452.56 - 454.31) ms	455.64 ± (454.74 - 456.54) ms	+0.5%	✅⬆️
runtime.dotnet.exceptions.count	0 ± (0 - 0)	0 ± (0 - 0)	+0.0%	✅
runtime.dotnet.mem.committed	36.38 ± (36.34 - 36.43) MB	36.42 ± (36.38 - 36.46) MB	+0.1%	✅⬆️
runtime.dotnet.threads.count	27 ± (27 - 27)	27 ± (27 - 27)	+0.0%	✅⬆️

HttpMessageHandler

Metric	Master (Mean ± 95% CI)	Current (Mean ± 95% CI)	Change	Status
.NET Framework 4.8 - Baseline
duration	194.02 ± (193.84 - 194.73) ms	193.52 ± (193.68 - 194.53) ms	-0.3%	✅
.NET Framework 4.8 - Bailout
duration	197.05 ± (196.89 - 197.39) ms	196.91 ± (196.91 - 197.59) ms	-0.1%	✅
.NET Framework 4.8 - CallTarget+Inlining+NGEN
duration	1109.78 ± (1111.34 - 1118.80) ms	1116.01 ± (1119.62 - 1128.66) ms	+0.6%	✅⬆️
.NET Core 3.1 - Baseline
process.internal_duration_ms	192.36 ± (191.93 - 192.78) ms	188.37 ± (188.05 - 188.68) ms	-2.1%	✅
process.time_to_main_ms	82.33 ± (82.09 - 82.58) ms	80.74 ± (80.55 - 80.93) ms	-1.9%	✅
runtime.dotnet.exceptions.count	3 ± (3 - 3)	3 ± (3 - 3)	+0.0%	✅
runtime.dotnet.mem.committed	16.04 ± (16.02 - 16.06) MB	16.12 ± (16.09 - 16.14) MB	+0.5%	✅⬆️
runtime.dotnet.threads.count	20 ± (20 - 20)	20 ± (20 - 20)	+0.2%	✅⬆️
.NET Core 3.1 - Bailout
process.internal_duration_ms	193.06 ± (192.61 - 193.50) ms	188.19 ± (187.86 - 188.52) ms	-2.5%	✅
process.time_to_main_ms	84.17 ± (83.94 - 84.41) ms	82.12 ± (81.97 - 82.27) ms	-2.4%	✅
runtime.dotnet.exceptions.count	3 ± (3 - 3)	3 ± (3 - 3)	+0.0%	✅
runtime.dotnet.mem.committed	16.07 ± (16.05 - 16.09) MB	16.13 ± (16.10 - 16.15) MB	+0.3%	✅⬆️
runtime.dotnet.threads.count	21 ± (20 - 21)	20 ± (20 - 21)	-0.3%	✅
.NET Core 3.1 - CallTarget+Inlining+NGEN
process.internal_duration_ms	402.34 ± (399.63 - 405.06) ms	402.13 ± (399.46 - 404.79) ms	-0.1%	✅
process.time_to_main_ms	481.90 ± (480.91 - 482.90) ms	475.24 ± (474.58 - 475.89) ms	-1.4%	✅
runtime.dotnet.exceptions.count	3 ± (3 - 3)	3 ± (3 - 3)	+0.0%	✅
runtime.dotnet.mem.committed	58.67 ± (58.55 - 58.78) MB	58.94 ± (58.83 - 59.05) MB	+0.5%	✅⬆️
runtime.dotnet.threads.count	29 ± (29 - 30)	29 ± (29 - 30)	-0.0%	✅
.NET 6 - Baseline
process.internal_duration_ms	193.35 ± (192.90 - 193.80) ms	193.09 ± (192.68 - 193.50) ms	-0.1%	✅
process.time_to_main_ms	70.53 ± (70.31 - 70.74) ms	70.53 ± (70.33 - 70.74) ms	+0.0%	✅⬆️
runtime.dotnet.exceptions.count	4 ± (4 - 4)	4 ± (4 - 4)	+0.0%	✅
runtime.dotnet.mem.committed	16.38 ± (16.35 - 16.41) MB	16.29 ± (16.18 - 16.40) MB	-0.6%	✅
runtime.dotnet.threads.count	19 ± (19 - 19)	19 ± (18 - 19)	-2.3%	✅
.NET 6 - Bailout
process.internal_duration_ms	191.98 ± (191.65 - 192.32) ms	194.19 ± (193.70 - 194.68) ms	+1.1%	✅⬆️
process.time_to_main_ms	71.05 ± (70.94 - 71.16) ms	71.58 ± (71.43 - 71.73) ms	+0.7%	✅⬆️
runtime.dotnet.exceptions.count	4 ± (4 - 4)	4 ± (4 - 4)	+0.0%	✅
runtime.dotnet.mem.committed	16.15 ± (15.99 - 16.31) MB	16.32 ± (16.24 - 16.40) MB	+1.1%	✅⬆️
runtime.dotnet.threads.count	19 ± (19 - 19)	20 ± (20 - 20)	+4.3%	✅⬆️
.NET 6 - CallTarget+Inlining+NGEN
process.internal_duration_ms	407.79 ± (405.83 - 409.75) ms	408.78 ± (406.88 - 410.68) ms	+0.2%	✅⬆️
process.time_to_main_ms	444.14 ± (443.42 - 444.86) ms	444.50 ± (443.80 - 445.20) ms	+0.1%	✅⬆️
runtime.dotnet.exceptions.count	4 ± (4 - 4)	4 ± (4 - 4)	+0.0%	✅
runtime.dotnet.mem.committed	59.11 ± (58.97 - 59.25) MB	59.12 ± (59.00 - 59.25) MB	+0.0%	✅⬆️
runtime.dotnet.threads.count	30 ± (30 - 30)	30 ± (29 - 30)	-0.1%	✅
.NET 8 - Baseline
process.internal_duration_ms	191.36 ± (190.95 - 191.76) ms	192.22 ± (191.81 - 192.63) ms	+0.5%	✅⬆️
process.time_to_main_ms	69.83 ± (69.64 - 70.02) ms	70.01 ± (69.83 - 70.19) ms	+0.3%	✅⬆️
runtime.dotnet.exceptions.count	4 ± (4 - 4)	4 ± (4 - 4)	+0.0%	✅
runtime.dotnet.mem.committed	11.74 ± (11.71 - 11.77) MB	11.72 ± (11.70 - 11.74) MB	-0.2%	✅
runtime.dotnet.threads.count	18 ± (18 - 18)	18 ± (18 - 18)	-0.0%	✅
.NET 8 - Bailout
process.internal_duration_ms	190.25 ± (189.97 - 190.53) ms	191.05 ± (190.70 - 191.39) ms	+0.4%	✅⬆️
process.time_to_main_ms	70.50 ± (70.40 - 70.60) ms	70.84 ± (70.71 - 70.97) ms	+0.5%	✅⬆️
runtime.dotnet.exceptions.count	4 ± (4 - 4)	4 ± (4 - 4)	+0.0%	✅
runtime.dotnet.mem.committed	11.82 ± (11.78 - 11.87) MB	11.73 ± (11.70 - 11.75) MB	-0.8%	✅
runtime.dotnet.threads.count	19 ± (19 - 19)	19 ± (19 - 19)	+0.0%	✅⬆️
.NET 8 - CallTarget+Inlining+NGEN
process.internal_duration_ms	370.98 ± (369.44 - 372.53) ms	368.09 ± (366.82 - 369.36) ms	-0.8%	✅
process.time_to_main_ms	430.80 ± (430.14 - 431.45) ms	432.17 ± (431.36 - 432.98) ms	+0.3%	✅⬆️
runtime.dotnet.exceptions.count	4 ± (4 - 4)	4 ± (4 - 4)	+0.0%	✅
runtime.dotnet.mem.committed	47.85 ± (47.82 - 47.88) MB	47.93 ± (47.90 - 47.96) MB	+0.2%	✅⬆️
runtime.dotnet.threads.count	29 ± (29 - 29)	29 ± (29 - 29)	+0.1%	✅⬆️

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 (7914) - mean (75ms)  : 70, 80
    master - mean (76ms)  : 71, 80

    section Bailout
    This PR (7914) - mean (81ms)  : 75, 86
    master - mean (80ms)  : 74, 86

    section CallTarget+Inlining+NGEN
    This PR (7914) - mean (1,064ms)  : 1002, 1125
    master - mean (1,062ms)  : 1003, 1120

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 (7914) - mean (119ms)  : 113, 125
    master - mean (119ms)  : 112, 127

    section Bailout
    This PR (7914) - mean (119ms)  : 114, 124
    master - mean (119ms)  : 111, 127

    section CallTarget+Inlining+NGEN
    This PR (7914) - mean (763ms)  : 732, 794
    master - mean (759ms)  : 725, 794

FakeDbCommand (.NET 6)

gantt
    title Execution time (ms) FakeDbCommand (.NET 6)
    dateFormat  x
    axisFormat %Q
    todayMarker off
    section Baseline
    This PR (7914) - mean (105ms)  : 100, 110
    master - mean (106ms)  : 100, 111

    section Bailout
    This PR (7914) - mean (108ms)  : 101, 115
    master - mean (107ms)  : 101, 112

    section CallTarget+Inlining+NGEN
    This PR (7914) - mean (711ms)  : 680, 741
    master - mean (711ms)  : 676, 746

FakeDbCommand (.NET 8)

gantt
    title Execution time (ms) FakeDbCommand (.NET 8)
    dateFormat  x
    axisFormat %Q
    todayMarker off
    section Baseline
    This PR (7914) - mean (104ms)  : 99, 109
    master - mean (103ms)  : 97, 110

    section Bailout
    This PR (7914) - mean (106ms)  : 100, 111
    master - mean (106ms)  : 99, 112

    section CallTarget+Inlining+NGEN
    This PR (7914) - mean (687ms)  : 651, 723
    master - mean (682ms)  : 653, 712

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 (7914) - mean (194ms)  : 189, 199
    master - mean (194ms)  : 190, 198

    section Bailout
    This PR (7914) - mean (197ms)  : 194, 201
    master - mean (197ms)  : 195, 200

    section CallTarget+Inlining+NGEN
    This PR (7914) - mean (1,124ms)  : 1059, 1189
    master - mean (1,115ms)  : 1065, 1165

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 (7914) - mean (278ms)  : 272, 283
    master - mean (283ms)  : 274, 292

    section Bailout
    This PR (7914) - mean (279ms)  : 275, 282
    master - mean (286ms)  : 278, 293

    section CallTarget+Inlining+NGEN
    This PR (7914) - mean (912ms)  : 867, 956
    master - mean (921ms)  : 871, 971

HttpMessageHandler (.NET 6)

gantt
    title Execution time (ms) HttpMessageHandler (.NET 6)
    dateFormat  x
    axisFormat %Q
    todayMarker off
    section Baseline
    This PR (7914) - mean (272ms)  : 266, 278
    master - mean (272ms)  : 266, 279

    section Bailout
    This PR (7914) - mean (274ms)  : 265, 283
    master - mean (271ms)  : 266, 275

    section CallTarget+Inlining+NGEN
    This PR (7914) - mean (885ms)  : 848, 923
    master - mean (885ms)  : 847, 922

HttpMessageHandler (.NET 8)

gantt
    title Execution time (ms) HttpMessageHandler (.NET 8)
    dateFormat  x
    axisFormat %Q
    todayMarker off
    section Baseline
    This PR (7914) - mean (272ms)  : 265, 279
    master - mean (271ms)  : 265, 276

    section Bailout
    This PR (7914) - mean (272ms)  : 266, 277
    master - mean (270ms)  : 267, 274

    section CallTarget+Inlining+NGEN
    This PR (7914) - mean (831ms)  : 809, 853
    master - mean (833ms)  : 809, 857

Dec 05 '25 17:12 dd-trace-dotnet-ci-bot[bot]