…tracer on shutdown

Replace the Mach-O LC_BUILD_VERSION compiler-version scanner (CompilerVersion.c/h)
with RuntimeInfo: an Xcode/SPM enum exposing runtimeName, runtimeVersion and
swiftVersion. It maps the XCTest bundle's DTXcode to a Swift version (Xcode 26+),
falling back to a single `swiftc --version` spawn only when needed (avoids the
subprocess on macOS for both Xcode and SPM). XCODE_SCHEME_NAME selects the case.

Thread the runtimeName/runtimeVersion through APIServiceConfig and
TestOptimizationApiService so TelemetryApplication reports them instead of
hardcoding "swift".

Make DDTestMonitor.tracer lazily recreatable: SessionManager.endSession now
shuts the tracer down (which tears down the global OpenTelemetry provider), and
DDTracer.deinit restores the default providers. The next session rebuilds a
tracer that re-registers a live SDK provider, so spans stay SpanSdk instead of
crashing the `as! SpanSdk` casts. The backing store is guarded by Synced to keep
the lazy init/reset race-free.

Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>

…refine device/runtime info

- shutdownTracer(): clear the tracer slot under the lock but run shutdown()
  outside it. shutdown() flushes/logs/uploads and stdout/stderr capture routes
  back through DDTestMonitor.tracer, so holding the non-reentrant lock during
  shutdown deadlocked.
- URLSessionInstrumentation: check URLSessionDelegate conformance via the ObjC
  runtime (InstrumentationUtils.classConforms, walking the superclass chain with
  class_conformsToProtocol) instead of a Swift `is` cast. The cast messages every
  class from objc_getClassList() and aborted on pathological internal classes
  (__NSGenericDeallocHandler, __NSAtom, __NSMessageBuilder).
- EnvironmentTests: update to the refactored PlatformUtils API
  (getPlatformVersion) and assert runtime tags against getRuntimeInfo().
- Device/Platform/RuntimeInfo refactor wiring (getDeviceInfo/getKernelInfo).

Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>

…umentation self-contained

Move the tracer off the global lazy accessor and onto the DDTestMonitor
instance: it's created in init and torn down with the monitor (stop() flushes
and shuts it down; DDTracer.deinit restores the default OpenTelemetry
providers). Removed the static `tracer` accessor entirely — callers use
`DDTestMonitor.instance?.tracer`, so no tracer is created when no monitor is
installed (this is what caused the accidental backend connection), and there's
no lock to deadlock on during shutdown.

Session-scoped span creators (DDSession/DDModule/DDSuite/DDTest) get the tracer
from SessionConfig.tracer, captured from the monitor when the session
bootstraps. Ambient callers (stdout/stderr capture, crash, XCUI, instrumentation
control) use the optional instance accessor and no-op without a monitor.

DDNetworkInstrumentation is now self-contained: injectHeaders / recordPayload /
disableNetworkCallStack / enableNetworkCallStackSymbolicated are its own
properties passed at init, and the URLSessionInstrumentationConfiguration
callbacks capture self weakly to break a retain cycle (config -> closures ->
self -> urlSessionInstrumentation -> config).

DDCrashes.install takes the tracer and returns CrashInformation? instead of
reaching into DDTestMonitor.instance; the monitor stores the result.

Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>

Restore the upload logging path: DataUploadWorker logs each batch's
success/retry/drop with a failure description (DataUploadStatus.failureDescription),
threaded through FeatureStoreAndUpload and the feature exporters. Remove the
now-redundant per-request logs in the API services and the orphaned
clientLibraryVersionHeader call. Drop the obsolete DeviceTests.

Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>

Move telemetry metrics and logs off OpenTelemetry into hand-written stores,
mirroring the existing MetricStore rationale (the DD intake wants raw samples /
minimal log values, not OTel-shaped data).

Metrics: drop the Typed* prefix — Counter<Tags>/Distribution<Tags> are now the
only instruments, each paired with a per-metric MetricTags type and a constrained
extension exposing the typed add/record. Removes the parallel untyped Counter/
Distribution/Factory and the one-off wrapper structs.

Logs: add a LogStore + telemetry.logs.error/warn/debug handler on Telemetry,
deduplicating identical logs into one entry with a count and draining on the
shared flush timer as the `logs` request type. Tags reuse the metric rendering.
Delete the now-unused OTel TelemetryLogExporter bridge and its test.

Also send DD-Client-Library-Version on the telemetry request directly, and
document both stores in ARCHITECTURE.md.

Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>

…mode

Capture the uncompressed request body before deflate and log it alongside the
response. Render payloads as UTF-8 text (JSON in nearly all cases), falling back
to a `<binary N bytes>` marker when the bytes aren't valid UTF-8.

Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>

…ields

Add request and response headers to the HTTPClient debug log. Capture just the
url, headers, and uncompressed body into a small LogFields value up front (only
when debug is on), so the completion handler no longer retains the full
URLRequest for the request's duration.

Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>

TelemetryMetric.Series.Point.timestamp is now Int64 unix seconds (rounded),
matching the intake's expected format, with a `time:` convenience init that
rounds a TimeInterval. MetricStore stamps points with the rounded clock value.

Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>

Replace DD-API-KEY and DD-APPLICATION-KEY values with **** in HTTPClient debug
header logs (names sourced from HTTPHeader.Field, matched case-insensitively).

Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>

Flip debugTelemetry to false for release; backend debug processing was only
needed while validating the telemetry pipeline.

Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>

The SDK can't instrument its own test run, so report unit-test results by
uploading the JUnit reports xcbeautify produces. Give each scheme/platform a
distinct report filename so the two unit-test schemes no longer overwrite one
junit.xml, then upload build/reports via datadog-ci in the unit-tests workflow
(runs on failure too; skips gracefully when DD_API_KEY is absent, e.g. fork PRs).

Use `npx --yes @datadog/datadog-ci` instead of a global install, here and in the
codeQL SARIF upload.

Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>