[Analyzers] Add analyzer to detect `new StringBuilder()` instead of `StringBuilderCache` by lucaspimentel · Pull Request #8400 · DataDog/dd-trace-dotnet

lucaspimentel · 2026-04-01T20:14:11Z

Summary of changes

Add a new Roslyn analyzer (DDALLOC003) that detects new StringBuilder() allocations and suggests using StringBuilderCache.Acquire() instead. StringBuilderCache uses a [ThreadStatic] cached instance to avoid heap allocations for short-lived builders.

Reason for change

StringBuilderCache exists in the codebase but there's no automated enforcement. Developers may use new StringBuilder() out of habit, missing the opportunity to reuse cached instances and reduce GC pressure.

Implementation details

New analyzer (StringBuilderCacheAnalyzer): flags new StringBuilder() and new StringBuilder(capacity) usages
Opt-in via .editorconfig: isEnabledByDefault: false, enabled as warning in tracer/src/Datadog.Trace/.editorconfig
False positive suppression:
- Skips StringBuilderCache class itself
- Skips field/property initializers and constructor assignments to fields (long-lived builders)
- Skips methods that already call StringBuilderCache.Acquire()
- Skips methods with multiple StringBuilder allocations (cache only holds one per thread)
- Scopes analysis to function boundaries (lambdas/local functions analyzed independently)
#pragma suppressions for remaining edge cases:
- IAST StringBuilderAspects (intentionally replacing customer allocations)
- MongoDB BsonSerializationHelper smoke test (ownership transferred to external API)

Test coverage

18 unit tests covering:

All constructor overloads (no args, capacity, string, string+capacity)
Field initializers, property initializers, constructor assignments to fields
StringBuilderCache class exclusion
Method-level StringBuilderCache.Acquire() suppression
Multiple builders in same method suppression
Lambda/local function scope isolation
Multiple builders in different methods (both flagged independently)

Other details

The analyzer is intentionally shipped disabled. To enable, add to .editorconfig:

dotnet_diagnostic.DDALLOC003.severity = warning

"I tried to cache a joke about StringBuilders, but it kept getting garbage collected." — Claude 🤖

🤖 Co-Authored-By: Claude Code <noreply@anthropic.com>

Backlog of 7 analyzers (DDALLOC001-007) to detect heap-allocation anti-patterns at compile time, covering: ToString() in log calls, missing JsonArrayPool, new StringBuilder, Enum.HasFlag/ToString boxing, capturing lambdas in Task.Run, and throw-in-AggressiveInlining methods. 🤖 Co-Authored-By: Claude Code <noreply@anthropic.com>

…ingBuilderCache` Diagnostic-only Roslyn analyzer (no code fix) that flags `new StringBuilder()` allocations and suggests using `StringBuilderCache.Acquire()` instead. Suppressed when the enclosing method already uses StringBuilderCache or when inside the StringBuilderCache class itself. 🤖 Co-Authored-By: Claude Code <noreply@anthropic.com>

🤖 Co-Authored-By: Claude Code <noreply@anthropic.com>

…ning 🤖 Co-Authored-By: Claude Code <noreply@anthropic.com>

🤖 Co-Authored-By: Claude Code <noreply@anthropic.com>

…ssignments 🤖 Co-Authored-By: Claude Code <noreply@anthropic.com>

🤖 Co-Authored-By: Claude Code <noreply@anthropic.com>

Disabled DDALLOC003 warning until existing usages are migrated.

dd-trace-dotnet-ci-bot · 2026-04-02T02:03:42Z

Execution-Time Benchmarks Report ⏱️

Execution-time results for samples comparing This PR (8400) 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	76.08 ± (76.02 - 76.40) ms	72.49 ± (72.40 - 72.76) ms	-4.7%	✅
.NET Framework 4.8 - Bailout
duration	80.67 ± (80.52 - 80.90) ms	76.12 ± (76.06 - 76.44) ms	-5.6%	✅
.NET Framework 4.8 - CallTarget+Inlining+NGEN
duration	1098.66 ± (1099.16 - 1104.78) ms	1058.98 ± (1060.73 - 1067.44) ms	-3.6%	✅
.NET Core 3.1 - Baseline
process.internal_duration_ms	23.20 ± (23.15 - 23.25) ms	22.42 ± (22.38 - 22.47) ms	-3.3%	✅
process.time_to_main_ms	89.25 ± (89.05 - 89.44) ms	84.18 ± (83.99 - 84.37) ms	-5.7%	✅
runtime.dotnet.exceptions.count	0 ± (0 - 0)	0 ± (0 - 0)	+0.0%	✅
runtime.dotnet.mem.committed	10.89 ± (10.89 - 10.90) MB	10.92 ± (10.92 - 10.92) MB	+0.2%	✅⬆️
runtime.dotnet.threads.count	12 ± (12 - 12)	12 ± (12 - 12)	+0.0%	✅
.NET Core 3.1 - Bailout
process.internal_duration_ms	23.24 ± (23.19 - 23.30) ms	22.29 ± (22.26 - 22.32) ms	-4.1%	✅
process.time_to_main_ms	90.56 ± (90.34 - 90.78) ms	85.37 ± (85.17 - 85.57) ms	-5.7%	✅
runtime.dotnet.exceptions.count	0 ± (0 - 0)	0 ± (0 - 0)	+0.0%	✅
runtime.dotnet.mem.committed	10.93 ± (10.93 - 10.94) MB	10.95 ± (10.94 - 10.95) MB	+0.1%	✅⬆️
runtime.dotnet.threads.count	13 ± (13 - 13)	13 ± (13 - 13)	+0.0%	✅
.NET Core 3.1 - CallTarget+Inlining+NGEN
process.internal_duration_ms	233.52 ± (232.52 - 234.53) ms	222.21 ± (221.14 - 223.28) ms	-4.8%	✅
process.time_to_main_ms	538.04 ± (536.72 - 539.35) ms	515.12 ± (514.00 - 516.24) ms	-4.3%	✅
runtime.dotnet.exceptions.count	0 ± (0 - 0)	0 ± (0 - 0)	+0.0%	✅
runtime.dotnet.mem.committed	47.63 ± (47.60 - 47.65) MB	47.77 ± (47.74 - 47.81) MB	+0.3%	✅⬆️
runtime.dotnet.threads.count	28 ± (28 - 28)	28 ± (28 - 28)	+0.0%	✅
.NET 6 - Baseline
process.internal_duration_ms	21.79 ± (21.75 - 21.83) ms	20.92 ± (20.88 - 20.96) ms	-4.0%	✅
process.time_to_main_ms	76.48 ± (76.26 - 76.70) ms	71.68 ± (71.53 - 71.83) ms	-6.3%	✅
runtime.dotnet.exceptions.count	0 ± (0 - 0)	0 ± (0 - 0)	+0.0%	✅
runtime.dotnet.mem.committed	10.62 ± (10.62 - 10.62) MB	10.63 ± (10.63 - 10.64) MB	+0.1%	✅⬆️
runtime.dotnet.threads.count	10 ± (10 - 10)	10 ± (10 - 10)	+0.0%	✅
.NET 6 - Bailout
process.internal_duration_ms	21.65 ± (21.60 - 21.71) ms	20.99 ± (20.95 - 21.02) ms	-3.1%	✅
process.time_to_main_ms	77.17 ± (76.98 - 77.35) ms	73.11 ± (72.95 - 73.28) ms	-5.3%	✅
runtime.dotnet.exceptions.count	0 ± (0 - 0)	0 ± (0 - 0)	+0.0%	✅
runtime.dotnet.mem.committed	10.73 ± (10.72 - 10.73) MB	10.75 ± (10.74 - 10.75) MB	+0.2%	✅⬆️
runtime.dotnet.threads.count	11 ± (11 - 11)	11 ± (11 - 11)	+0.0%	✅
.NET 6 - CallTarget+Inlining+NGEN
process.internal_duration_ms	384.63 ± (382.52 - 386.74) ms	384.61 ± (382.36 - 386.85) ms	-0.0%	✅
process.time_to_main_ms	539.71 ± (538.63 - 540.78) ms	516.26 ± (515.33 - 517.19) ms	-4.3%	✅
runtime.dotnet.exceptions.count	0 ± (0 - 0)	0 ± (0 - 0)	+0.0%	✅
runtime.dotnet.mem.committed	49.93 ± (49.89 - 49.96) MB	49.91 ± (49.89 - 49.94) MB	-0.0%	✅
runtime.dotnet.threads.count	28 ± (28 - 28)	28 ± (28 - 28)	-0.1%	✅
.NET 8 - Baseline
process.internal_duration_ms	20.01 ± (19.97 - 20.06) ms	19.29 ± (19.26 - 19.31) ms	-3.6%	✅
process.time_to_main_ms	75.99 ± (75.83 - 76.14) ms	71.61 ± (71.46 - 71.77) ms	-5.8%	✅
runtime.dotnet.exceptions.count	0 ± (0 - 0)	0 ± (0 - 0)	+0.0%	✅
runtime.dotnet.mem.committed	7.66 ± (7.66 - 7.67) MB	7.68 ± (7.67 - 7.68) MB	+0.2%	✅⬆️
runtime.dotnet.threads.count	10 ± (10 - 10)	10 ± (10 - 10)	+0.0%	✅
.NET 8 - Bailout
process.internal_duration_ms	20.05 ± (20.00 - 20.10) ms	19.41 ± (19.37 - 19.45) ms	-3.2%	✅
process.time_to_main_ms	77.45 ± (77.30 - 77.61) ms	72.56 ± (72.41 - 72.70) ms	-6.3%	✅
runtime.dotnet.exceptions.count	0 ± (0 - 0)	0 ± (0 - 0)	+0.0%	✅
runtime.dotnet.mem.committed	7.72 ± (7.71 - 7.73) MB	7.72 ± (7.72 - 7.73) MB	+0.1%	✅⬆️
runtime.dotnet.threads.count	11 ± (11 - 11)	11 ± (11 - 11)	+0.0%	✅
.NET 8 - CallTarget+Inlining+NGEN
process.internal_duration_ms	306.40 ± (304.15 - 308.65) ms	309.88 ± (307.91 - 311.85) ms	+1.1%	✅⬆️
process.time_to_main_ms	498.65 ± (497.71 - 499.60) ms	473.81 ± (472.99 - 474.63) ms	-5.0%	✅
runtime.dotnet.exceptions.count	0 ± (0 - 0)	0 ± (0 - 0)	+0.0%	✅
runtime.dotnet.mem.committed	36.95 ± (36.93 - 36.97) MB	36.98 ± (36.95 - 37.00) MB	+0.1%	✅⬆️
runtime.dotnet.threads.count	27 ± (27 - 27)	27 ± (27 - 27)	+0.7%	✅⬆️

HttpMessageHandler

Metric	Master (Mean ± 95% CI)	Current (Mean ± 95% CI)	Change	Status
.NET Framework 4.8 - Baseline
duration	188.70 ± (188.76 - 189.41) ms	188.74 ± (188.67 - 189.39) ms	+0.0%	✅⬆️
.NET Framework 4.8 - Bailout
duration	192.42 ± (192.25 - 192.58) ms	192.24 ± (192.00 - 192.38) ms	-0.1%	✅
.NET Framework 4.8 - CallTarget+Inlining+NGEN
duration	1128.71 ± (1128.00 - 1134.47) ms	1131.57 ± (1134.03 - 1142.97) ms	+0.3%	✅⬆️
.NET Core 3.1 - Baseline
process.internal_duration_ms	184.42 ± (184.11 - 184.73) ms	183.77 ± (183.51 - 184.04) ms	-0.3%	✅
process.time_to_main_ms	79.28 ± (79.08 - 79.47) ms	79.08 ± (78.92 - 79.23) ms	-0.3%	✅
runtime.dotnet.exceptions.count	3 ± (3 - 3)	3 ± (3 - 3)	+0.0%	✅
runtime.dotnet.mem.committed	16.01 ± (15.93 - 16.10) MB	16.07 ± (15.99 - 16.14) MB	+0.3%	✅⬆️
runtime.dotnet.threads.count	19 ± (19 - 20)	19 ± (19 - 19)	-1.7%	✅
.NET Core 3.1 - Bailout
process.internal_duration_ms	183.49 ± (183.27 - 183.71) ms	183.54 ± (183.26 - 183.83) ms	+0.0%	✅⬆️
process.time_to_main_ms	80.41 ± (80.31 - 80.50) ms	80.35 ± (80.26 - 80.45) ms	-0.1%	✅
runtime.dotnet.exceptions.count	3 ± (3 - 3)	3 ± (3 - 3)	+0.0%	✅
runtime.dotnet.mem.committed	15.80 ± (15.66 - 15.95) MB	16.12 ± (16.06 - 16.18) MB	+2.0%	✅⬆️
runtime.dotnet.threads.count	20 ± (20 - 20)	21 ± (20 - 21)	+3.1%	✅⬆️
.NET Core 3.1 - CallTarget+Inlining+NGEN
process.internal_duration_ms	391.01 ± (389.77 - 392.24) ms	391.90 ± (390.84 - 392.96) ms	+0.2%	✅⬆️
process.time_to_main_ms	501.90 ± (500.88 - 502.92) ms	502.56 ± (501.54 - 503.58) ms	+0.1%	✅⬆️
runtime.dotnet.exceptions.count	3 ± (3 - 3)	3 ± (3 - 3)	+0.0%	✅
runtime.dotnet.mem.committed	58.21 ± (58.04 - 58.38) MB	58.37 ± (58.23 - 58.51) MB	+0.3%	✅⬆️
runtime.dotnet.threads.count	30 ± (30 - 30)	30 ± (30 - 30)	+0.0%	✅⬆️
.NET 6 - Baseline
process.internal_duration_ms	188.03 ± (187.78 - 188.28) ms	188.63 ± (188.37 - 188.89) ms	+0.3%	✅⬆️
process.time_to_main_ms	68.93 ± (68.80 - 69.07) ms	69.07 ± (68.94 - 69.20) ms	+0.2%	✅⬆️
runtime.dotnet.exceptions.count	4 ± (4 - 4)	4 ± (4 - 4)	+0.0%	✅
runtime.dotnet.mem.committed	15.55 ± (15.37 - 15.72) MB	15.71 ± (15.54 - 15.89) MB	+1.1%	✅⬆️
runtime.dotnet.threads.count	17 ± (17 - 18)	17 ± (17 - 18)	-0.3%	✅
.NET 6 - Bailout
process.internal_duration_ms	187.74 ± (187.60 - 187.88) ms	187.30 ± (187.15 - 187.44) ms	-0.2%	✅
process.time_to_main_ms	69.81 ± (69.76 - 69.85) ms	69.99 ± (69.93 - 70.05) ms	+0.3%	✅⬆️
runtime.dotnet.exceptions.count	4 ± (4 - 4)	4 ± (4 - 4)	+0.0%	✅
runtime.dotnet.mem.committed	15.95 ± (15.79 - 16.11) MB	15.44 ± (15.28 - 15.60) MB	-3.2%	✅
runtime.dotnet.threads.count	19 ± (19 - 19)	18 ± (18 - 18)	-3.3%	✅
.NET 6 - CallTarget+Inlining+NGEN
process.internal_duration_ms	596.68 ± (593.95 - 599.41) ms	594.92 ± (591.70 - 598.14) ms	-0.3%	✅
process.time_to_main_ms	504.29 ± (503.37 - 505.22) ms	502.95 ± (502.14 - 503.76) ms	-0.3%	✅
runtime.dotnet.exceptions.count	4 ± (4 - 4)	4 ± (4 - 4)	+0.0%	✅
runtime.dotnet.mem.committed	61.44 ± (61.35 - 61.54) MB	61.47 ± (61.37 - 61.56) MB	+0.0%	✅⬆️
runtime.dotnet.threads.count	30 ± (30 - 30)	30 ± (30 - 30)	-0.1%	✅
.NET 8 - Baseline
process.internal_duration_ms	185.45 ± (185.21 - 185.70) ms	185.94 ± (185.66 - 186.22) ms	+0.3%	✅⬆️
process.time_to_main_ms	68.18 ± (68.05 - 68.30) ms	68.42 ± (68.29 - 68.55) ms	+0.4%	✅⬆️
runtime.dotnet.exceptions.count	4 ± (4 - 4)	4 ± (4 - 4)	+0.0%	✅
runtime.dotnet.mem.committed	11.80 ± (11.75 - 11.86) MB	11.68 ± (11.59 - 11.76) MB	-1.1%	✅
runtime.dotnet.threads.count	18 ± (18 - 18)	18 ± (17 - 18)	-3.3%	✅
.NET 8 - Bailout
process.internal_duration_ms	184.85 ± (184.67 - 185.03) ms	185.29 ± (185.10 - 185.49) ms	+0.2%	✅⬆️
process.time_to_main_ms	69.27 ± (69.21 - 69.33) ms	69.30 ± (69.25 - 69.35) ms	+0.0%	✅⬆️
runtime.dotnet.exceptions.count	4 ± (4 - 4)	4 ± (4 - 4)	+0.0%	✅
runtime.dotnet.mem.committed	11.65 ± (11.54 - 11.75) MB	11.67 ± (11.57 - 11.78) MB	+0.2%	✅⬆️
runtime.dotnet.threads.count	18 ± (18 - 19)	18 ± (18 - 19)	+0.2%	✅⬆️
.NET 8 - CallTarget+Inlining+NGEN
process.internal_duration_ms	523.27 ± (520.98 - 525.56) ms	520.58 ± (517.83 - 523.34) ms	-0.5%	✅
process.time_to_main_ms	457.03 ± (456.32 - 457.74) ms	459.18 ± (458.41 - 459.95) ms	+0.5%	✅⬆️
runtime.dotnet.exceptions.count	4 ± (4 - 4)	4 ± (4 - 4)	+0.0%	✅
runtime.dotnet.mem.committed	50.67 ± (50.65 - 50.70) MB	50.67 ± (50.64 - 50.70) MB	-0.0%	✅
runtime.dotnet.threads.count	30 ± (30 - 30)	30 ± (30 - 30)	-0.0%	✅

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 (8400) - mean (73ms)  : 70, 75
    master - mean (76ms)  : 73, 79

    section Bailout
    This PR (8400) - mean (76ms)  : 74, 79
    master - mean (81ms)  : 78, 83

    section CallTarget+Inlining+NGEN
    This PR (8400) - mean (1,064ms)  : 1015, 1113
    master - mean (1,102ms)  : 1061, 1143

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 (8400) - mean (113ms)  : 110, 117
    master - mean (120ms)  : 116, 124

    section Bailout
    This PR (8400) - mean (114ms)  : 112, 117
    master - mean (121ms)  : 118, 124

    section CallTarget+Inlining+NGEN
    This PR (8400) - mean (775ms)  : 757, 794
    master - mean (810ms)  : 786, 835

FakeDbCommand (.NET 6)

gantt
    title Execution time (ms) FakeDbCommand (.NET 6)
    dateFormat  x
    axisFormat %Q
    todayMarker off
    section Baseline
    This PR (8400) - mean (99ms)  : 96, 102
    master - mean (105ms)  : 100, 109

    section Bailout
    This PR (8400) - mean (100ms)  : 98, 103
    master - mean (105ms)  : 103, 108

    section CallTarget+Inlining+NGEN
    This PR (8400) - mean (928ms)  : 896, 960
    master - mean (950ms)  : 919, 982

FakeDbCommand (.NET 8)

gantt
    title Execution time (ms) FakeDbCommand (.NET 8)
    dateFormat  x
    axisFormat %Q
    todayMarker off
    section Baseline
    This PR (8400) - mean (98ms)  : 95, 102
    master - mean (104ms)  : 101, 107

    section Bailout
    This PR (8400) - mean (100ms)  : 97, 102
    master - mean (105ms)  : 103, 108

    section CallTarget+Inlining+NGEN
    This PR (8400) - mean (813ms)  : 780, 846
    master - mean (835ms)  : 795, 876

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 (8400) - mean (189ms)  : 186, 193
    master - mean (189ms)  : 186, 192

    section Bailout
    This PR (8400) - mean (192ms)  : 190, 194
    master - mean (192ms)  : 191, 194

    section CallTarget+Inlining+NGEN
    This PR (8400) - mean (1,139ms)  : 1071, 1206
    master - mean (1,131ms)  : 1085, 1177

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 (8400) - mean (271ms)  : 267, 275
    master - mean (272ms)  : 268, 276

    section Bailout
    This PR (8400) - mean (272ms)  : 268, 275
    master - mean (272ms)  : 269, 275

    section CallTarget+Inlining+NGEN
    This PR (8400) - mean (925ms)  : 884, 967
    master - mean (921ms)  : 892, 951

HttpMessageHandler (.NET 6)

gantt
    title Execution time (ms) HttpMessageHandler (.NET 6)
    dateFormat  x
    axisFormat %Q
    todayMarker off
    section Baseline
    This PR (8400) - mean (266ms)  : 262, 270
    master - mean (265ms)  : 261, 269

    section Bailout
    This PR (8400) - mean (265ms)  : 262, 267
    master - mean (265ms)  : 263, 267

    section CallTarget+Inlining+NGEN
    This PR (8400) - mean (1,126ms)  : 1077, 1174
    master - mean (1,131ms)  : 1092, 1170

HttpMessageHandler (.NET 8)

gantt
    title Execution time (ms) HttpMessageHandler (.NET 8)
    dateFormat  x
    axisFormat %Q
    todayMarker off
    section Baseline
    This PR (8400) - mean (264ms)  : 260, 268
    master - mean (263ms)  : 259, 266

    section Bailout
    This PR (8400) - mean (264ms)  : 261, 266
    master - mean (263ms)  : 260, 266

    section CallTarget+Inlining+NGEN
    This PR (8400) - mean (1,013ms)  : 974, 1053
    master - mean (1,012ms)  : 967, 1058

lucaspimentel added 11 commits March 27, 2026 15:35

Add find-allocation-opportunities skill

d10661f

🤖 Co-Authored-By: Claude Code <noreply@anthropic.com>

Improve allocation skill assessment criteria

f0b7184

🤖 Co-Authored-By: Claude Code <noreply@anthropic.com>

Add argument hint to allocation skill

a94ed94

🤖 Co-Authored-By: Claude Code <noreply@anthropic.com>

Remove TODO backlog file

6699660

🤖 Co-Authored-By: Claude Code <noreply@anthropic.com>

Change DDALLOC003 to opt-in via .editorconfig and set severity to War…

9a99c90

…ning 🤖 Co-Authored-By: Claude Code <noreply@anthropic.com>

Remove find-allocation-opportunities skill

97a077c

🤖 Co-Authored-By: Claude Code <noreply@anthropic.com>

Suppress DDALLOC003 for field/property initializers and constructor a…

9ca3eeb

…ssignments 🤖 Co-Authored-By: Claude Code <noreply@anthropic.com>

Suppress DDALLOC003 when multiple StringBuilders exist in the same scope

d0384ee

🤖 Co-Authored-By: Claude Code <noreply@anthropic.com>

Suppress DDALLOC003 for IAST aspects and MongoDB smoke test via #pragma

21a9d98

🤖 Co-Authored-By: Claude Code <noreply@anthropic.com>

lucaspimentel changed the title ~~[Tracer] Add DDALLOC003 analyzer: detect new StringBuilder() instead of StringBuilderCache~~ [Analyzers] Add analyzer to detect new StringBuilder() instead of StringBuilderCache Apr 1, 2026

lucaspimentel added area:builds project files, build scripts, pipelines, versioning, releases, packages AI Generated Largely based on code generated by an AI or LLM. This label is the same across all dd-trace-* repos labels Apr 1, 2026

disable DDALLOC003

d671661

Disabled DDALLOC003 warning until existing usages are migrated.

Provide feedback

Saved searches

Use saved searches to filter your results more quickly

[Analyzers] Add analyzer to detect `new StringBuilder()` instead of `StringBuilderCache`#8400

[Analyzers] Add analyzer to detect `new StringBuilder()` instead of `StringBuilderCache`#8400
lucaspimentel wants to merge 12 commits intomasterfrom
lpimentel/allocation-analyzer-stringbuilder-cache

lucaspimentel commented Apr 1, 2026 •

edited

Loading

Uh oh!

dd-trace-dotnet-ci-bot bot commented Apr 2, 2026

FakeDbCommand

HttpMessageHandler

Uh oh!

Reviewers

Assignees

Labels

Projects

Milestone

Development

Uh oh!

1 participant

Conversation

lucaspimentel commented Apr 1, 2026 • edited Loading Uh oh! There was an error while loading. Please reload this page.

Uh oh!

Summary of changes

Reason for change

Implementation details

Test coverage

Other details

Uh oh!

dd-trace-dotnet-ci-bot bot commented Apr 2, 2026

Execution-Time Benchmarks Report ⏱️

FakeDbCommand

HttpMessageHandler

Uh oh!

Reviewers

Assignees

Labels

Projects

Milestone

Development

Uh oh!

1 participant

lucaspimentel commented Apr 1, 2026 •

edited

Loading