Fix APISecurity::RouteExtractor for Rails 8.1.1+

[y9v]

What does this PR do?

This PR:

• fixes route extraction for Rails 8.1.1+
• adds a rescue to APISecurity::RouteExtractor.route_pattern with telemetry error reporting
• changes the slow path for Rails to always wrap the rack request to router request class
• adds explicit string conversion for route pattern value to APISecurity::Sampler

Motivation:
#5040

Rails 8.1.1 removes the action_dispatch.route_uri_pattern from request.env and replaces it with action_dispatch.route:
rails/rails@6fd05c9

Change log entry
Yes. AppSec: Fix route extraction error for Rails 8.1.1+.

Additional Notes:
None.

How to test the change?
CI and manual testing.

[pr-commenter]

Benchmarks

Benchmark execution time: 2025-11-12 17:02:36

Comparing candidate commit a693370 in PR branch fix-api-security-route-extractor-for-rails-8-1-1 with baseline commit e0ab5b7 in branch master.

Found 2 performance improvements and 5 performance regressions! Performance is the same for 37 metrics, 2 unstable metrics.

scenario:line instrumentation - targeted

• 🟥 throughput [-10242.344op/s; -9733.947op/s] or [-6.787%; -6.450%]

scenario:line instrumentation - untargeted

• 🟥 throughput [-4494.546op/s; -4365.642op/s] or [-7.723%; -7.502%]

scenario:method instrumentation

• 🟥 throughput [-12683.003op/s; -12233.694op/s] or [-7.312%; -7.053%]

scenario:profiling - Allocations (baseline)

• 🟥 throughput [-505440.426op/s; -491189.705op/s] or [-9.617%; -9.346%]

scenario:tracing - Propagation - Datadog

• 🟩 throughput [+2136.898op/s; +2209.683op/s] or [+7.387%; +7.639%]

scenario:tracing - Propagation - Trace Context

• 🟥 throughput [-4807.122op/s; -4700.574op/s] or [-12.683%; -12.402%]

scenario:tracing - Tracing.log_correlation

• 🟩 throughput [+7426.408op/s; +7722.851op/s] or [+7.402%; +7.697%]

[datadog-official]

✅ Tests

🎉 All green!

❄️ No new flaky tests detected
🧪 All tests passed

🎯 Code Coverage
• Patch Coverage: 101.69%
• Total Coverage: 98.58% (+0.05%)

View detailed report

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

Thanks for taking care 🤗